| IRS990/AccountantCompileOrReviewInd | 0 | 0 |
| IRS990/AccountsPayableAccrExpnssGrp/BOYAmt | 0 | 2353882 |
| IRS990/AccountsPayableAccrExpnssGrp/EOYAmt | 0 | 2198298 |
| IRS990/AccountsReceivableGrp/BOYAmt | 0 | 2290919 |
| IRS990/AccountsReceivableGrp/EOYAmt | 0 | 1869275 |
| IRS990/ActivitiesConductedPrtshpInd | 0 | 0 |
| IRS990/ActivityOrMissionDesc | 0 | BELL EXISTS TO TRANSFORM THE ACADEMIC ACHIEVEMENTS, SELF-CONFIDENCE, AND LIFE TRAJECTORIES OF CHILDREN LIVING IN UNDER-RESOURCED COMMUNITIES. |
| IRS990/AdvertisingGrp/ProgramServicesAmt | 0 | 446473 |
| IRS990/AdvertisingGrp/TotalAmt | 0 | 446473 |
| IRS990/AllOtherContributionsAmt | 0 | 10725115 |
| IRS990/AllOtherExpensesGrp/FundraisingAmt | 0 | 102036 |
| IRS990/AllOtherExpensesGrp/ManagementAndGeneralAmt | 0 | 117510 |
| IRS990/AllOtherExpensesGrp/ProgramServicesAmt | 0 | 238488 |
| IRS990/AllOtherExpensesGrp/TotalAmt | 0 | 458034 |
| IRS990/AnnualDisclosureCoveredPrsnInd | 0 | 1 |
| IRS990/AuditCommitteeInd | 0 | 1 |
| IRS990/BooksInCareOfDetail/BusinessName/BusinessNameLine1Txt | 0 | ANTONIO BATTAGLIA PRESIDENTCOO |
| IRS990/BooksInCareOfDetail/PhoneNum | 0 | 6172821567 |
| IRS990/BooksInCareOfDetail/USAddress/AddressLine1Txt | 0 | 60 CLAYTON STREET |
| IRS990/BooksInCareOfDetail/USAddress/CityNm | 0 | DORCHESTER |
| IRS990/BooksInCareOfDetail/USAddress/StateAbbreviationCd | 0 | MA |
| IRS990/BooksInCareOfDetail/USAddress/ZIPCd | 0 | 02122 |
| IRS990/BusinessRlnWithFamMemInd | 0 | 0 |
| IRS990/BusinessRlnWithOfficerEntInd | 0 | 0 |
| IRS990/BusinessRlnWithOrgMemInd | 0 | 0 |
| IRS990/CashNonInterestBearingGrp/BOYAmt | 0 | 1583882 |
| IRS990/CashNonInterestBearingGrp/EOYAmt | 0 | 1277038 |
| IRS990/ChangeToOrgDocumentsInd | 0 | 0 |
| IRS990/CntrctRcvdGreaterThan100KCnt | 0 | 3 |
| IRS990/CollectionsOfArtInd | 0 | 0 |
| IRS990/CompCurrentOfcrDirectorsGrp/FundraisingAmt | 0 | 202397 |
| IRS990/CompCurrentOfcrDirectorsGrp/ManagementAndGeneralAmt | 0 | 555485 |
| IRS990/CompCurrentOfcrDirectorsGrp/ProgramServicesAmt | 0 | 349386 |
| IRS990/CompCurrentOfcrDirectorsGrp/TotalAmt | 0 | 1107268 |
| IRS990/CompensationFromOtherSrcsInd | 0 | 0 |
| IRS990/CompensationProcessCEOInd | 0 | 1 |
| IRS990/CompensationProcessOtherInd | 0 | 1 |
| IRS990/ConflictOfInterestPolicyInd | 0 | 1 |
| IRS990/ConservationEasementsInd | 0 | 0 |
| IRS990/ConsolidatedAuditFinclStmtInd | 0 | 0 |
| IRS990/ContractorCompensationGrp/CompensationAmt | 0 | 486364 |
| IRS990/ContractorCompensationGrp/CompensationAmt | 1 | 159751 |
| IRS990/ContractorCompensationGrp/CompensationAmt | 2 | 130956 |
| IRS990/ContractorCompensationGrp/ContractorAddress/USAddress/AddressLine1Txt | 0 | 8 FANEUIL HALL MARKETPLACE 3RD FLO |
| IRS990/ContractorCompensationGrp/ContractorAddress/USAddress/AddressLine1Txt | 1 | PO BOX 1213 |
| IRS990/ContractorCompensationGrp/ContractorAddress/USAddress/AddressLine1Txt | 2 | 2 SHARP STREET UNIT B |
| IRS990/ContractorCompensationGrp/ContractorAddress/USAddress/CityNm | 0 | BOSTON |
| IRS990/ContractorCompensationGrp/ContractorAddress/USAddress/CityNm | 1 | OWINGS MILLS |
| IRS990/ContractorCompensationGrp/ContractorAddress/USAddress/CityNm | 2 | HINGHAM |
| IRS990/ContractorCompensationGrp/ContractorAddress/USAddress/StateAbbreviationCd | 0 | MA |
| IRS990/ContractorCompensationGrp/ContractorAddress/USAddress/StateAbbreviationCd | 1 | MD |
| IRS990/ContractorCompensationGrp/ContractorAddress/USAddress/StateAbbreviationCd | 2 | MA |
| IRS990/ContractorCompensationGrp/ContractorAddress/USAddress/ZIPCd | 0 | 02109 |
| IRS990/ContractorCompensationGrp/ContractorAddress/USAddress/ZIPCd | 1 | 21117 |
| IRS990/ContractorCompensationGrp/ContractorAddress/USAddress/ZIPCd | 2 | 02043 |
| IRS990/ContractorCompensationGrp/ContractorName/BusinessName/BusinessNameLine1Txt | 0 | THE CROSSLAND GROUP |
| IRS990/ContractorCompensationGrp/ContractorName/BusinessName/BusinessNameLine1Txt | 1 | LEADERS OF TOMORROW YOUTH CENTER INC |
| IRS990/ContractorCompensationGrp/ContractorName/BusinessName/BusinessNameLine1Txt | 2 | ECRATCHIT |
| IRS990/ContractorCompensationGrp/ServicesDesc | 0 | ORGANIZATIONAL CONSULTING SERVICE |
| IRS990/ContractorCompensationGrp/ServicesDesc | 1 | ACADEMIC ENRICHMENT SERVICES |
| IRS990/ContractorCompensationGrp/ServicesDesc | 2 | ACCOUNTING/BOOKKEEPING |
| IRS990/CreditCounselingInd | 0 | 0 |
| IRS990/CYBenefitsPaidToMembersAmt | 0 | 0 |
| IRS990/CYContributionsGrantsAmt | 0 | 17566325 |
| IRS990/CYGrantsAndSimilarPaidAmt | 0 | 0 |
| IRS990/CYInvestmentIncomeAmt | 0 | 45954 |
| IRS990/CYOtherExpensesAmt | 0 | 6244482 |
| IRS990/CYOtherRevenueAmt | 0 | 33746 |
| IRS990/CYProgramServiceRevenueAmt | 0 | 1570058 |
| IRS990/CYRevenuesLessExpensesAmt | 0 | 3215513 |
| IRS990/CYSalariesCompEmpBnftPaidAmt | 0 | 9756088 |
| IRS990/CYTotalExpensesAmt | 0 | 16000570 |
| IRS990/CYTotalFundraisingExpenseAmt | 0 | 1230157 |
| IRS990/CYTotalProfFndrsngExpnsAmt | 0 | 0 |
| IRS990/CYTotalRevenueAmt | 0 | 19216083 |
| IRS990/DecisionsSubjectToApprovaInd | 0 | 0 |
| IRS990/DeductibleArtContributionInd | 0 | 0 |
| IRS990/DeductibleNonCashContriInd | 0 | 0 |
| IRS990/DeferredRevenueGrp/BOYAmt | 0 | 619754 |
| IRS990/DeferredRevenueGrp/EOYAmt | 0 | 388217 |
| IRS990/DelegationOfMgmtDutiesInd | 0 | 0 |
| IRS990/DepreciationDepletionGrp/FundraisingAmt | 0 | 13618 |
| IRS990/DepreciationDepletionGrp/ManagementAndGeneralAmt | 0 | 24459 |
| IRS990/DepreciationDepletionGrp/ProgramServicesAmt | 0 | 19836 |
| IRS990/DepreciationDepletionGrp/TotalAmt | 0 | 57913 |
| IRS990/Desc | 0 | SUMMERBELL'S SUMMER PROGRAMS BOOST SCHOLAR ACHIEVEMENT, SUPPORT SUCCESSFUL TRANSITIONS THROUGH THE ELEMENTARY AND MIDDLE SCHOOL GRADES, AND ELIMINATE SUMMER LEARNING LOSS FOR AT-RISK STUDENTS. BELL'S SUMMER LEARNING APPROACH BLENDS RIGOROUS ACADEMIC INSTRUCTION WITH HANDS-ON ENRICHMENT COURSES, PROJECT-BASED LEARNING, FIELD TRIPS, AND COMMUNITY ENGAGEMENT. DURING FISCAL YEAR 2018, 16,086 SCHOLARS PARTICIPATED IN 153 SCHOOL- AND COMMUNITY-BASED SUMMER PROGRAMS. SUMMER PROGRAMS GENERALLY OPERATE UP TO FIVE DAYS PER WEEK, EIGHT HOURS PER DAY, FOR EIGHT WEEKS. BELL DELIVERS SUMMER PROGRAMS DIRECTLY AND TRAINS AND SUPPORTS SCHOOLS AND NONPROFIT ORGANIZATIONS TO OPERATE EVIDENCE-BASED PROGRAMS FOR THEIR STUDENTS. FOR EXAMPLE, BELL TRAINED 101 LOCAL YMCA ASSOCIATIONS ACROSS THE COUNTRY TO DELIVER THE POWER SCHOLARS ACADEMY, A PROGRAM BASED ON BELL'S EVIDENCE-BASED MODEL. ASSESSMENT DATA SHOW THAT SCHOLARS WHO ATTENDED BELL'S SUMMER LEARNING PROGRAMS GAINED NEW READING AND MATH SKILLS. THEY AVOIDED SUMMER LEARNING LOSS AND RETURNED TO SCHOOL IN THE FALL HAVING GAINED READING AND MATH SKILLS. IN ADDITION, NINE OUT OF TEN TEACHERS REPORTED THAT SUMMER PROGRAMS INCREASED SCHOLARS' SELF-CONFIDENCE, AND NINE OUT OF TEN PARENTS REPORTED THEY BECAME MORE ENGAGED IN THEIR CHILD'S EDUCATION. |
| IRS990/DescribedInSection501c3Ind | 0 | 1 |
| IRS990/DisregardedEntityInd | 0 | 0 |
| IRS990/DocumentRetentionPolicyInd | 0 | 1 |
| IRS990/DonorAdvisedFundInd | 0 | 0 |
| IRS990/ElectionOfBoardMembersInd | 0 | 0 |
| IRS990/EmployeeCnt | 0 | 904 |
| IRS990/EmploymentTaxReturnsFiledInd | 0 | 1 |
| IRS990/EngagedInExcessBenefitTransInd | 0 | 0 |
| IRS990/ExpenseAmt | 0 | 8210919 |
| IRS990/FamilyOrBusinessRlnInd | 0 | 0 |
| IRS990/FederalGrantAuditRequiredInd | 0 | 0 |
| IRS990/FederatedCampaignsAmt | 0 | 238947 |
| IRS990/FeesForServicesAccountingGrp/ManagementAndGeneralAmt | 0 | 87343 |
| IRS990/FeesForServicesAccountingGrp/ProgramServicesAmt | 0 | 43032 |
| IRS990/FeesForServicesAccountingGrp/TotalAmt | 0 | 130375 |
| IRS990/FeesForServicesLegalGrp/ProgramServicesAmt | 0 | 5324 |
| IRS990/FeesForServicesLegalGrp/TotalAmt | 0 | 5324 |
| IRS990/FeesForServicesOtherGrp/FundraisingAmt | 0 | 35499 |
| IRS990/FeesForServicesOtherGrp/ManagementAndGeneralAmt | 0 | 955492 |
| IRS990/FeesForServicesOtherGrp/ProgramServicesAmt | 0 | 63363 |
| IRS990/FeesForServicesOtherGrp/TotalAmt | 0 | 1054354 |
| IRS990/ForeignActivitiesInd | 0 | 0 |
| IRS990/ForeignFinancialAccountInd | 0 | 0 |
| IRS990/ForeignOfficeInd | 0 | 0 |
| IRS990/Form8282PropertyDisposedOfInd | 0 | 0 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 0 | 5.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 1 | 5.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 2 | 5.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 3 | 5.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 4 | 5.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 5 | 5.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 6 | 5.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 7 | 5.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 8 | 5.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 9 | 5.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 10 | 5.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 11 | 40.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 12 | 40.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 13 | 40.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 14 | 40.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 15 | 40.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 16 | 40.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 17 | 40.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 18 | 40.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 19 | 40.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 20 | 40.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 21 | 40.00 |
| IRS990/Form990PartVIISectionAGrp/FormerOfcrDirectorTrusteeInd | 0 | X |
| IRS990/Form990PartVIISectionAGrp/HighestCompensatedEmployeeInd | 0 | X |
| IRS990/Form990PartVIISectionAGrp/HighestCompensatedEmployeeInd | 1 | X |
| IRS990/Form990PartVIISectionAGrp/HighestCompensatedEmployeeInd | 2 | X |
| IRS990/Form990PartVIISectionAGrp/HighestCompensatedEmployeeInd | 3 | X |
| IRS990/Form990PartVIISectionAGrp/HighestCompensatedEmployeeInd | 4 | X |
| IRS990/Form990PartVIISectionAGrp/IndividualTrusteeOrDirectorInd | 0 | X |
| IRS990/Form990PartVIISectionAGrp/IndividualTrusteeOrDirectorInd | 1 | X |
| IRS990/Form990PartVIISectionAGrp/IndividualTrusteeOrDirectorInd | 2 | X |
| IRS990/Form990PartVIISectionAGrp/IndividualTrusteeOrDirectorInd | 3 | X |
| IRS990/Form990PartVIISectionAGrp/IndividualTrusteeOrDirectorInd | 4 | X |
| IRS990/Form990PartVIISectionAGrp/IndividualTrusteeOrDirectorInd | 5 | X |
| IRS990/Form990PartVIISectionAGrp/IndividualTrusteeOrDirectorInd | 6 | X |
| IRS990/Form990PartVIISectionAGrp/IndividualTrusteeOrDirectorInd | 7 | X |
| IRS990/Form990PartVIISectionAGrp/IndividualTrusteeOrDirectorInd | 8 | X |
| IRS990/Form990PartVIISectionAGrp/IndividualTrusteeOrDirectorInd | 9 | X |
| IRS990/Form990PartVIISectionAGrp/IndividualTrusteeOrDirectorInd | 10 | X |
| IRS990/Form990PartVIISectionAGrp/IndividualTrusteeOrDirectorInd | 11 | X |
| IRS990/Form990PartVIISectionAGrp/KeyEmployeeInd | 0 | X |
| IRS990/Form990PartVIISectionAGrp/KeyEmployeeInd | 1 | X |
| IRS990/Form990PartVIISectionAGrp/KeyEmployeeInd | 2 | X |
| IRS990/Form990PartVIISectionAGrp/OfficerInd | 0 | X |
| IRS990/Form990PartVIISectionAGrp/OfficerInd | 1 | X |
| IRS990/Form990PartVIISectionAGrp/OfficerInd | 2 | X |
| IRS990/Form990PartVIISectionAGrp/OfficerInd | 3 | X |
| IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt | 0 | 0 |
| IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt | 1 | 0 |
| IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt | 2 | 0 |
| IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt | 3 | 0 |
| IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt | 4 | 0 |
| IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt | 5 | 0 |
| IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt | 6 | 0 |
| IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt | 7 | 0 |
| IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt | 8 | 0 |
| IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt | 9 | 0 |
| IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt | 10 | 0 |
| IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt | 11 | 16147 |
| IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt | 12 | 18084 |
| IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt | 13 | 16646 |
| IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt | 14 | 2044 |
| IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt | 15 | 2608 |
| IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt | 16 | 16789 |
| IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt | 17 | 12632 |
| IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt | 18 | 232 |
| IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt | 19 | 17909 |
| IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt | 20 | 15695 |
| IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt | 21 | 17423 |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 0 | LAURENE SPERLING |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 1 | PAULA ARROJO |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 2 | MICHAEL BELL |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 3 | CHRIS BULGER |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 4 | GENE GUILL |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 5 | JOHN J-H KIM |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 6 | GEORGE NEBLE |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 7 | PAUL REVILLE |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 8 | LAURA SAMBERG |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 9 | GARRETT SMITH |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 10 | DAVID ZILBERMAN |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 11 | LAUREN GILBERT |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 12 | ANTONIO BATTAGLIA |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 13 | MARLENE HARRINGTON |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 14 | TIFFANY GUEYE |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 15 | DANIEL DOBIN |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 16 | PARTHEEV SHAH |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 17 | KRISTINE MURRAY |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 18 | BRENDA MCLAUGHLIN |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 19 | DAMON JOHNSON |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 20 | ANDREW MANSON |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 21 | JAIME CRESPO |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 0 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 1 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 2 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 3 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 4 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 5 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 6 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 7 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 8 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 9 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 10 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 11 | 244727 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 12 | 238453 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 13 | 174430 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 14 | 347829 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 15 | 150586 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 16 | 174055 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 17 | 114430 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 18 | 104364 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 19 | 120985 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 20 | 115242 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 21 | 105897 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromRltdOrgAmt | 0 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromRltdOrgAmt | 1 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromRltdOrgAmt | 2 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromRltdOrgAmt | 3 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromRltdOrgAmt | 4 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromRltdOrgAmt | 5 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromRltdOrgAmt | 6 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromRltdOrgAmt | 7 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromRltdOrgAmt | 8 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromRltdOrgAmt | 9 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromRltdOrgAmt | 10 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromRltdOrgAmt | 11 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromRltdOrgAmt | 12 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromRltdOrgAmt | 13 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromRltdOrgAmt | 14 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromRltdOrgAmt | 15 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromRltdOrgAmt | 16 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromRltdOrgAmt | 17 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromRltdOrgAmt | 18 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromRltdOrgAmt | 19 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromRltdOrgAmt | 20 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromRltdOrgAmt | 21 | 0 |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 0 | CHAIR |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 1 | VICE CHAIR |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 2 | DIRECTOR |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 3 | DIRECTOR |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 4 | DIRECTOR |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 5 | DIRECTOR |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 6 | DIRECTOR |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 7 | DIRECTOR |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 8 | DIRECTOR |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 9 | DIRECTOR |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 10 | DIRECTOR |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 11 | CEO (AS OF JULY 2017) |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 12 | PRESIDENT/CHIEF OPERATING OFFICER |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 13 | CHIEF DEVELOPMENT OFFICER |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 14 | FORMER PRESIDENT/CEO (THRU JUNE 2017) |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 15 | CHIEF OF STAFF (THRU JUNE 2018) |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 16 | VICE PRESIDENT - PARTNER SOLUTIONS |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 17 | EXECUTIVE DIRECTOR |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 18 | CHIEF STRATEGY OFFICER |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 19 | VICE PRESIDENT - PARTNER IMPACT |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 20 | SENIOR DIRECTOR - TECHNOLOGY & DATA OPERATIONS |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 21 | DIRECTOR, COMMUNICATIONS AND EXTERNAL RELATIONS |
| IRS990/Form990ProvidedToGvrnBodyInd | 0 | 1 |
| IRS990/FormationYr | 0 | 1992 |
| IRS990/FormerOfcrEmployeesListedInd | 0 | 1 |
| IRS990/FSAuditedBasisGrp/SeparateBasisFinclStmtInd | 0 | X |
| IRS990/FSAuditedInd | 0 | 1 |
| IRS990/FundraisingActivitiesInd | 0 | 0 |
| IRS990/GamingActivitiesInd | 0 | 0 |
| IRS990/GoverningBodyVotingMembersCnt | 0 | 12 |
| IRS990/GovernmentGrantsAmt | 0 | 6602263 |
| IRS990/GrantsToIndividualsInd | 0 | 0 |
| IRS990/GrantsToOrganizationsInd | 0 | 0 |
| IRS990/GrantToRelatedPersonInd | 0 | 0 |
| IRS990/GrossReceiptsAmt | 0 | 19216083 |
| IRS990/GroupReturnForAffiliatesInd | 0 | 0 |
| IRS990/IncludeFIN48FootnoteInd | 0 | 0 |
| IRS990/IndependentAuditFinclStmtInd | 0 | 1 |
| IRS990/IndependentVotingMemberCnt | 0 | 11 |
| IRS990/IndivRcvdGreaterThan100KCnt | 0 | 11 |
| IRS990/IndoorTanningServicesInd | 0 | 0 |
| IRS990/InfoInScheduleOPartIIIInd | 0 | X |
| IRS990/InfoInScheduleOPartVIInd | 0 | X |
| IRS990/InformationTechnologyGrp/FundraisingAmt | 0 | 77728 |
| IRS990/InformationTechnologyGrp/ManagementAndGeneralAmt | 0 | 139597 |
| IRS990/InformationTechnologyGrp/ProgramServicesAmt | 0 | 348209 |
| IRS990/InformationTechnologyGrp/TotalAmt | 0 | 565534 |
| IRS990/InsuranceGrp/FundraisingAmt | 0 | 21711 |
| IRS990/InsuranceGrp/ManagementAndGeneralAmt | 0 | 38993 |
| IRS990/InsuranceGrp/ProgramServicesAmt | 0 | 53366 |
| IRS990/InsuranceGrp/TotalAmt | 0 | 114070 |
| IRS990/InvestmentIncomeGrp/ExclusionAmt | 0 | 45954 |
| IRS990/InvestmentIncomeGrp/TotalRevenueColumnAmt | 0 | 45954 |
| IRS990/InvestmentInJointVentureInd | 0 | 0 |
| IRS990/IRPDocumentCnt | 0 | 46 |
| IRS990/IRPDocumentW2GCnt | 0 | 0 |
| IRS990/LandBldgEquipAccumDeprecAmt | 0 | 2635811 |
| IRS990/LandBldgEquipBasisNetGrp/BOYAmt | 0 | 112418 |
| IRS990/LandBldgEquipBasisNetGrp/EOYAmt | 0 | 54505 |
| IRS990/LandBldgEquipCostOrOtherBssAmt | 0 | 2690316 |
| IRS990/LegalDomicileStateCd | 0 | MA |
| IRS990/LoanOutstandingInd | 0 | 0 |
| IRS990/LobbyingActivitiesInd | 0 | 0 |
| IRS990/LocalChaptersInd | 0 | 0 |
| IRS990/MaterialDiversionOrMisuseInd | 0 | 0 |
| IRS990/MembersOrStockholdersInd | 0 | 0 |
| IRS990/MethodOfAccountingAccrualInd | 0 | X |
| IRS990/MinutesOfCommitteesInd | 0 | 1 |
| IRS990/MinutesOfGoverningBodyInd | 0 | 1 |
| IRS990/MissionDesc | 0 | TO TRANSFORM THE ACADEMIC ACHIEVEMENTS, SELF-CONFIDENCE, AND LIFE TRAJECTORIES OF CHILDREN LIVING IN UNDER-RESOURCED COMMUNITIES. BECAUSE BELL BELIEVES IN THE TREMENDOUS POTENTIAL OF ALL CHILDREN TO EXCEL, IT RECOGNIZES THEM AS SCHOLARS. |
| IRS990/MoreThan5000KToIndividualsInd | 0 | 0 |
| IRS990/MoreThan5000KToOrgInd | 0 | 0 |
| IRS990/NetAssetsOrFundBalancesBOYAmt | 0 | 13175681 |
| IRS990/NetAssetsOrFundBalancesEOYAmt | 0 | 16391194 |
| IRS990/NetUnrelatedBusTxblIncmAmt | 0 | 0 |
| IRS990/NondeductibleContributionsInd | 0 | 0 |
| IRS990/OccupancyGrp/FundraisingAmt | 0 | 60298 |
| IRS990/OccupancyGrp/ManagementAndGeneralAmt | 0 | 108294 |
| IRS990/OccupancyGrp/ProgramServicesAmt | 0 | 214446 |
| IRS990/OccupancyGrp/TotalAmt | 0 | 383038 |
| IRS990/OfficeExpensesGrp/FundraisingAmt | 0 | 37968 |
| IRS990/OfficeExpensesGrp/ManagementAndGeneralAmt | 0 | 68250 |
| IRS990/OfficeExpensesGrp/ProgramServicesAmt | 0 | 335614 |
| IRS990/OfficeExpensesGrp/TotalAmt | 0 | 441832 |
| IRS990/OfficerMailingAddressInd | 0 | 0 |
| IRS990/OperateHospitalInd | 0 | 0 |
| IRS990/Organization501c3Ind | 0 | X |
| IRS990/OrganizationFollowsSFAS117Ind | 0 | X |
| IRS990/OtherAssetsTotalGrp/BOYAmt | 0 | 43670 |
| IRS990/OtherAssetsTotalGrp/EOYAmt | 0 | 338670 |
| IRS990/OtherChangesInNetAssetsAmt | 0 | 0 |
| IRS990/OtherEmployeeBenefitsGrp/FundraisingAmt | 0 | 47681 |
| IRS990/OtherEmployeeBenefitsGrp/ManagementAndGeneralAmt | 0 | 48900 |
| IRS990/OtherEmployeeBenefitsGrp/ProgramServicesAmt | 0 | 274246 |
| IRS990/OtherEmployeeBenefitsGrp/TotalAmt | 0 | 370827 |
| IRS990/OtherExpensesGrp/Desc | 0 | BOOKS AND CURRICULUM |
| IRS990/OtherExpensesGrp/Desc | 1 | FIELD TRIPS AND EVENTS |
| IRS990/OtherExpensesGrp/Desc | 2 | STAFF TRAINING |
| IRS990/OtherExpensesGrp/Desc | 3 | PROGRAM SUPPLIES |
| IRS990/OtherExpensesGrp/ManagementAndGeneralAmt | 0 | 19405 |
| IRS990/OtherExpensesGrp/ManagementAndGeneralAmt | 1 | 10522 |
| IRS990/OtherExpensesGrp/ProgramServicesAmt | 0 | 1298972 |
| IRS990/OtherExpensesGrp/ProgramServicesAmt | 1 | 367772 |
| IRS990/OtherExpensesGrp/ProgramServicesAmt | 2 | 213963 |
| IRS990/OtherExpensesGrp/ProgramServicesAmt | 3 | 141138 |
| IRS990/OtherExpensesGrp/TotalAmt | 0 | 1298972 |
| IRS990/OtherExpensesGrp/TotalAmt | 1 | 367772 |
| IRS990/OtherExpensesGrp/TotalAmt | 2 | 233368 |
| IRS990/OtherExpensesGrp/TotalAmt | 3 | 151660 |
| IRS990/OtherRevenueMiscGrp/BusinessCd | 0 | 611600 |
| IRS990/OtherRevenueMiscGrp/Desc | 0 | MISCELLANEOUS |
| IRS990/OtherRevenueMiscGrp/ExclusionAmt | 0 | 33746 |
| IRS990/OtherRevenueMiscGrp/TotalRevenueColumnAmt | 0 | 33746 |
| IRS990/OtherRevenueTotalAmt | 0 | 33746 |
| IRS990/OtherSalariesAndWagesGrp/FundraisingAmt | 0 | 521766 |
| IRS990/OtherSalariesAndWagesGrp/ManagementAndGeneralAmt | 0 | 360272 |
| IRS990/OtherSalariesAndWagesGrp/ProgramServicesAmt | 0 | 6670442 |
| IRS990/OtherSalariesAndWagesGrp/TotalAmt | 0 | 7552480 |
| IRS990/OtherWebsiteInd | 0 | X |
| IRS990/OwnWebsiteInd | 0 | X |
| IRS990/PartialLiquidationInd | 0 | 0 |
| IRS990/PayPremiumsPrsnlBnftCntrctInd | 0 | 0 |
| IRS990/PayrollTaxesGrp/FundraisingAmt | 0 | 51923 |
| IRS990/PayrollTaxesGrp/ManagementAndGeneralAmt | 0 | 44434 |
| IRS990/PayrollTaxesGrp/ProgramServicesAmt | 0 | 610108 |
| IRS990/PayrollTaxesGrp/TotalAmt | 0 | 706465 |
| IRS990/PensionPlanContributionsGrp/FundraisingAmt | 0 | 2791 |
| IRS990/PensionPlanContributionsGrp/ManagementAndGeneralAmt | 0 | 3669 |
| IRS990/PensionPlanContributionsGrp/ProgramServicesAmt | 0 | 12588 |
| IRS990/PensionPlanContributionsGrp/TotalAmt | 0 | 19048 |
| IRS990/PledgesAndGrantsReceivableGrp/BOYAmt | 0 | 5613379 |
| IRS990/PledgesAndGrantsReceivableGrp/EOYAmt | 0 | 3884001 |
| IRS990/PoliticalCampaignActyInd | 0 | 0 |
| IRS990/PrepaidExpensesDefrdChargesGrp/BOYAmt | 0 | 1034398 |
| IRS990/PrepaidExpensesDefrdChargesGrp/EOYAmt | 0 | 749982 |
| IRS990/PrincipalOfficerNm | 0 | ANTONIO BATTAGLIA |
| IRS990/ProfessionalFundraisingInd | 0 | 0 |
| IRS990/ProgramServiceRevenueGrp/BusinessCd | 0 | 624410 |
| IRS990/ProgramServiceRevenueGrp/Desc | 0 | SUMMER PROGRAM FEES |
| IRS990/ProgramServiceRevenueGrp/RelatedOrExemptFuncIncomeAmt | 0 | 1570058 |
| IRS990/ProgramServiceRevenueGrp/TotalRevenueColumnAmt | 0 | 1570058 |
| IRS990/ProgSrvcAccomActy2Grp/Desc | 0 | AFTER-SCHOOLBELL'S AFTER-SCHOOL PROGRAMS EQUIP STUDENTS WITH THE ACADEMIC SKILLS, SELF-CONFIDENCE, AND SOCIAL SKILLS THEY NEED TO SUCCEED DURING THE SCHOOL DAY. PROGRAMS BLEND SMALL-GROUP INSTRUCTION IN LITERACY AND MATH; MENTORSHIP FROM TEACHERS AND COLLEGE STUDENTS; EXPERIENTIAL LEARNING THROUGH ENRICHMENT ACTIVITIES AND COMMUNITY ENGAGEMENT; PARENTAL INVOLVEMENT; AND ONGOING TRAINING AND PROFESSIONAL DEVELOPMENT FOR STAFF. DURING THE 2017-2018 SCHOOL YEAR, BELL SERVED OVER 1,000 SCHOLARS IN ITS AFTER-SCHOOL PROGRAMS AT 16 SCHOOLS IN BALTIMORE, HONOLULU, DAYTON, SAN FRANCISCO AND NEW YORK CITY. PROGRAMS OPERATED FOR UP TO THREE HOURS PER DAY AND FIVE DAYS PER WEEK. ASSESSMENT DATA SHOW THAT EIGHT OUT OF TEN SCHOLARS WHO ATTENDED THE PROGRAM INCREASED THEIR SCALED SCORES IN READING AND MATH. NINE OUT OF TEN TEACHERS REPORTED THAT THE PROGRAM INCREASED SCHOLARS' SELF-CONFIDENCE, AND NINE OUT OF TEN PARENTS REPORTED THEY BECAME MORE ENGAGED IN THEIR CHILD'S EDUCATION. |
| IRS990/ProgSrvcAccomActy2Grp/ExpenseAmt | 0 | 2921948 |
| IRS990/ProgSrvcAccomActy3Grp/Desc | 0 | STRATEGIC INITIATIVESSTRATEGIC INITIATIVES ARE DESIGNED TO PROVIDE FOR THE FUTURE, LOWER COSTS PER SCHOLAR, AND PROMOTE PUBLIC AWARENESS AND THE BRAND OF THE ORGANIZATION. |
| IRS990/ProgSrvcAccomActy3Grp/ExpenseAmt | 0 | 956608 |
| IRS990/ProhibitedTaxShelterTransInd | 0 | 0 |
| IRS990/PYBenefitsPaidToMembersAmt | 0 | 0 |
| IRS990/PYContributionsGrantsAmt | 0 | 17919158 |
| IRS990/PYExcessBenefitTransInd | 0 | 0 |
| IRS990/PYGrantsAndSimilarPaidAmt | 0 | 0 |
| IRS990/PYInvestmentIncomeAmt | 0 | 26846 |
| IRS990/PYOtherExpensesAmt | 0 | 5087347 |
| IRS990/PYOtherRevenueAmt | 0 | 38360 |
| IRS990/PYProgramServiceRevenueAmt | 0 | 1587115 |