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Condensed Consolidated Statements of Partners' Capital (USD $)
Total
USD ($)
General Partner
USD ($)
Number of Units
Beneficial Unit Certificate Holders
USD ($)
Unallocated Deficit of Consolidated VIEs
USD ($)
Noncontrolling Interest
USD ($)
Accumulated Other Comprehensive Income (Loss) [Member]
USD ($)
Balance at Dec. 31, 2013 $ 203,122,765us-gaap_PartnersCapitalIncludingPortionAttributableToNoncontrollingInterest $ 16,671us-gaap_PartnersCapitalIncludingPortionAttributableToNoncontrollingInterest
/ us-gaap_PartnerCapitalComponentsAxis
= us-gaap_GeneralPartnerMember
  $ 223,573,312us-gaap_PartnersCapitalIncludingPortionAttributableToNoncontrollingInterest
/ us-gaap_PartnerCapitalComponentsAxis
= us-gaap_LimitedPartnerMember
$ (20,455,896)us-gaap_PartnersCapitalIncludingPortionAttributableToNoncontrollingInterest
/ us-gaap_PartnerCapitalComponentsAxis
= atax_UnallocatedDeficitOfVariableInterestEntitiesMember
$ (11,322)us-gaap_PartnersCapitalIncludingPortionAttributableToNoncontrollingInterest
/ us-gaap_PartnerCapitalComponentsAxis
= us-gaap_NoncontrollingInterestMember
$ (20,128,314)us-gaap_PartnersCapitalIncludingPortionAttributableToNoncontrollingInterest
/ us-gaap_PartnerCapitalComponentsAxis
= us-gaap_AccumulatedOtherComprehensiveIncomeMember
Partners' Capital Account, Units at Dec. 31, 2013     51,052,928us-gaap_PartnersCapitalAccountUnits
/ us-gaap_PartnerCapitalComponentsAxis
= us-gaap_CapitalUnitsMember
       
Stock Issued During Period, Shares, New Issues     9,200,000us-gaap_StockIssuedDuringPeriodSharesNewIssues
/ us-gaap_PartnerCapitalComponentsAxis
= us-gaap_CapitalUnitsMember
       
Proceeds from Issuance of Common Stock 51,367,692us-gaap_ProceedsFromIssuanceOfCommonStock     51,367,692us-gaap_ProceedsFromIssuanceOfCommonStock
/ us-gaap_PartnerCapitalComponentsAxis
= us-gaap_LimitedPartnerMember
  0us-gaap_ProceedsFromIssuanceOfCommonStock
/ us-gaap_PartnerCapitalComponentsAxis
= us-gaap_NoncontrollingInterestMember
0us-gaap_ProceedsFromIssuanceOfCommonStock
/ us-gaap_PartnerCapitalComponentsAxis
= us-gaap_AccumulatedOtherComprehensiveIncomeMember
Available-for-sale Securities, Gross Realized Gain (Loss) (1,743,088)us-gaap_AvailableForSaleSecuritiesGrossRealizedGainLossNet (17,431)us-gaap_AvailableForSaleSecuritiesGrossRealizedGainLossNet
/ us-gaap_PartnerCapitalComponentsAxis
= us-gaap_GeneralPartnerMember
  (1,725,657)us-gaap_AvailableForSaleSecuritiesGrossRealizedGainLossNet
/ us-gaap_PartnerCapitalComponentsAxis
= us-gaap_LimitedPartnerMember
0us-gaap_AvailableForSaleSecuritiesGrossRealizedGainLossNet
/ us-gaap_PartnerCapitalComponentsAxis
= atax_UnallocatedDeficitOfVariableInterestEntitiesMember
  (1,743,088)us-gaap_AvailableForSaleSecuritiesGrossRealizedGainLossNet
/ us-gaap_PartnerCapitalComponentsAxis
= us-gaap_AccumulatedOtherComprehensiveIncomeMember
Distributions paid or accrued (8,295,025)us-gaap_PartnersCapitalAccountDistributions (763,409)us-gaap_PartnersCapitalAccountDistributions
/ us-gaap_PartnerCapitalComponentsAxis
= us-gaap_GeneralPartnerMember
  (7,531,616)us-gaap_PartnersCapitalAccountDistributions
/ us-gaap_PartnerCapitalComponentsAxis
= us-gaap_LimitedPartnerMember
0us-gaap_PartnersCapitalAccountDistributions
/ us-gaap_PartnerCapitalComponentsAxis
= atax_UnallocatedDeficitOfVariableInterestEntitiesMember
0us-gaap_PartnersCapitalAccountDistributions
/ us-gaap_PartnerCapitalComponentsAxis
= us-gaap_NoncontrollingInterestMember
0us-gaap_PartnersCapitalAccountDistributions
/ us-gaap_PartnerCapitalComponentsAxis
= us-gaap_AccumulatedOtherComprehensiveIncomeMember
Net income (loss) 6,046,726us-gaap_ProfitLoss 742,055us-gaap_ProfitLoss
/ us-gaap_PartnerCapitalComponentsAxis
= us-gaap_GeneralPartnerMember
  5,417,545us-gaap_ProfitLoss
/ us-gaap_PartnerCapitalComponentsAxis
= us-gaap_LimitedPartnerMember
(112,771)us-gaap_ProfitLoss
/ us-gaap_PartnerCapitalComponentsAxis
= atax_UnallocatedDeficitOfVariableInterestEntitiesMember
(103)us-gaap_ProfitLoss
/ us-gaap_PartnerCapitalComponentsAxis
= us-gaap_NoncontrollingInterestMember
0us-gaap_ProfitLoss
/ us-gaap_PartnerCapitalComponentsAxis
= us-gaap_AccumulatedOtherComprehensiveIncomeMember
Unrealized Gain (Loss) on Securities 18,041,725us-gaap_UnrealizedGainLossOnSecurities 180,417us-gaap_UnrealizedGainLossOnSecurities
/ us-gaap_PartnerCapitalComponentsAxis
= us-gaap_GeneralPartnerMember
  17,861,308us-gaap_UnrealizedGainLossOnSecurities
/ us-gaap_PartnerCapitalComponentsAxis
= us-gaap_LimitedPartnerMember
0us-gaap_UnrealizedGainLossOnSecurities
/ us-gaap_PartnerCapitalComponentsAxis
= atax_UnallocatedDeficitOfVariableInterestEntitiesMember
0us-gaap_UnrealizedGainLossOnSecurities
/ us-gaap_PartnerCapitalComponentsAxis
= us-gaap_NoncontrollingInterestMember
18,041,725us-gaap_UnrealizedGainLossOnSecurities
/ us-gaap_PartnerCapitalComponentsAxis
= us-gaap_AccumulatedOtherComprehensiveIncomeMember
Other Comprehensive Income (Loss), Unrealized Holding Gain (Loss) on Securities Arising During Period, Net of Tax 3,489,237us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax 34,892us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax
/ us-gaap_PartnerCapitalComponentsAxis
= us-gaap_GeneralPartnerMember
  3,454,345us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax
/ us-gaap_PartnerCapitalComponentsAxis
= us-gaap_LimitedPartnerMember
0us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax
/ us-gaap_PartnerCapitalComponentsAxis
= atax_UnallocatedDeficitOfVariableInterestEntitiesMember
0us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax
/ us-gaap_PartnerCapitalComponentsAxis
= us-gaap_NoncontrollingInterestMember
3,489,237us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax
/ us-gaap_PartnerCapitalComponentsAxis
= us-gaap_AccumulatedOtherComprehensiveIncomeMember
Balance at Mar. 31, 2014 272,030,032us-gaap_PartnersCapitalIncludingPortionAttributableToNoncontrollingInterest 193,195us-gaap_PartnersCapitalIncludingPortionAttributableToNoncontrollingInterest
/ us-gaap_PartnerCapitalComponentsAxis
= us-gaap_GeneralPartnerMember
  292,416,929us-gaap_PartnersCapitalIncludingPortionAttributableToNoncontrollingInterest
/ us-gaap_PartnerCapitalComponentsAxis
= us-gaap_LimitedPartnerMember
(20,568,667)us-gaap_PartnersCapitalIncludingPortionAttributableToNoncontrollingInterest
/ us-gaap_PartnerCapitalComponentsAxis
= atax_UnallocatedDeficitOfVariableInterestEntitiesMember
(11,425)us-gaap_PartnersCapitalIncludingPortionAttributableToNoncontrollingInterest
/ us-gaap_PartnerCapitalComponentsAxis
= us-gaap_NoncontrollingInterestMember
(340,441)us-gaap_PartnersCapitalIncludingPortionAttributableToNoncontrollingInterest
/ us-gaap_PartnerCapitalComponentsAxis
= us-gaap_AccumulatedOtherComprehensiveIncomeMember
Balance at Dec. 31, 2014 309,927,904us-gaap_PartnersCapitalIncludingPortionAttributableToNoncontrollingInterest 578,238us-gaap_PartnersCapitalIncludingPortionAttributableToNoncontrollingInterest
/ us-gaap_PartnerCapitalComponentsAxis
= us-gaap_GeneralPartnerMember
  330,457,117us-gaap_PartnersCapitalIncludingPortionAttributableToNoncontrollingInterest
/ us-gaap_PartnerCapitalComponentsAxis
= us-gaap_LimitedPartnerMember
(21,091,456)us-gaap_PartnersCapitalIncludingPortionAttributableToNoncontrollingInterest
/ us-gaap_PartnerCapitalComponentsAxis
= atax_UnallocatedDeficitOfVariableInterestEntitiesMember
(15,995)us-gaap_PartnersCapitalIncludingPortionAttributableToNoncontrollingInterest
/ us-gaap_PartnerCapitalComponentsAxis
= us-gaap_NoncontrollingInterestMember
51,698,418us-gaap_PartnersCapitalIncludingPortionAttributableToNoncontrollingInterest
/ us-gaap_PartnerCapitalComponentsAxis
= us-gaap_AccumulatedOtherComprehensiveIncomeMember
Partners' Capital Account, Units at Dec. 31, 2014     60,252,928us-gaap_PartnersCapitalAccountUnits
/ us-gaap_PartnerCapitalComponentsAxis
= us-gaap_CapitalUnitsMember
       
Distributions paid or accrued (7,607,693)us-gaap_PartnersCapitalAccountDistributions (76,077)us-gaap_PartnersCapitalAccountDistributions
/ us-gaap_PartnerCapitalComponentsAxis
= us-gaap_GeneralPartnerMember
  (7,531,616)us-gaap_PartnersCapitalAccountDistributions
/ us-gaap_PartnerCapitalComponentsAxis
= us-gaap_LimitedPartnerMember
0us-gaap_PartnersCapitalAccountDistributions
/ us-gaap_PartnerCapitalComponentsAxis
= atax_UnallocatedDeficitOfVariableInterestEntitiesMember
0us-gaap_PartnersCapitalAccountDistributions
/ us-gaap_PartnerCapitalComponentsAxis
= us-gaap_NoncontrollingInterestMember
0us-gaap_PartnersCapitalAccountDistributions
/ us-gaap_PartnerCapitalComponentsAxis
= us-gaap_AccumulatedOtherComprehensiveIncomeMember
Net income (loss) 2,523,588us-gaap_ProfitLoss 26,706us-gaap_ProfitLoss
/ us-gaap_PartnerCapitalComponentsAxis
= us-gaap_GeneralPartnerMember
  2,643,939us-gaap_ProfitLoss
/ us-gaap_PartnerCapitalComponentsAxis
= us-gaap_LimitedPartnerMember
(146,166)us-gaap_ProfitLoss
/ us-gaap_PartnerCapitalComponentsAxis
= atax_UnallocatedDeficitOfVariableInterestEntitiesMember
(891)us-gaap_ProfitLoss
/ us-gaap_PartnerCapitalComponentsAxis
= us-gaap_NoncontrollingInterestMember
0us-gaap_ProfitLoss
/ us-gaap_PartnerCapitalComponentsAxis
= us-gaap_AccumulatedOtherComprehensiveIncomeMember
Unrealized Gain (Loss) on Securities (1,057,235)us-gaap_UnrealizedGainLossOnSecurities (10,572)us-gaap_UnrealizedGainLossOnSecurities
/ us-gaap_PartnerCapitalComponentsAxis
= us-gaap_GeneralPartnerMember
  (1,046,663)us-gaap_UnrealizedGainLossOnSecurities
/ us-gaap_PartnerCapitalComponentsAxis
= us-gaap_LimitedPartnerMember
0us-gaap_UnrealizedGainLossOnSecurities
/ us-gaap_PartnerCapitalComponentsAxis
= atax_UnallocatedDeficitOfVariableInterestEntitiesMember
0us-gaap_UnrealizedGainLossOnSecurities
/ us-gaap_PartnerCapitalComponentsAxis
= us-gaap_NoncontrollingInterestMember
(1,057,235)us-gaap_UnrealizedGainLossOnSecurities
/ us-gaap_PartnerCapitalComponentsAxis
= us-gaap_AccumulatedOtherComprehensiveIncomeMember
Other Comprehensive Income (Loss), Unrealized Holding Gain (Loss) on Securities Arising During Period, Net of Tax (576,225)us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax (5,762)us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax
/ us-gaap_PartnerCapitalComponentsAxis
= us-gaap_GeneralPartnerMember
  (570,463)us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax
/ us-gaap_PartnerCapitalComponentsAxis
= us-gaap_LimitedPartnerMember
0us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax
/ us-gaap_PartnerCapitalComponentsAxis
= atax_UnallocatedDeficitOfVariableInterestEntitiesMember
0us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax
/ us-gaap_PartnerCapitalComponentsAxis
= us-gaap_NoncontrollingInterestMember
(576,225)us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax
/ us-gaap_PartnerCapitalComponentsAxis
= us-gaap_AccumulatedOtherComprehensiveIncomeMember
Balance at Mar. 31, 2015 $ 303,210,339us-gaap_PartnersCapitalIncludingPortionAttributableToNoncontrollingInterest $ 512,533us-gaap_PartnersCapitalIncludingPortionAttributableToNoncontrollingInterest
/ us-gaap_PartnerCapitalComponentsAxis
= us-gaap_GeneralPartnerMember
  $ 323,952,314us-gaap_PartnersCapitalIncludingPortionAttributableToNoncontrollingInterest
/ us-gaap_PartnerCapitalComponentsAxis
= us-gaap_LimitedPartnerMember
$ (21,237,622)us-gaap_PartnersCapitalIncludingPortionAttributableToNoncontrollingInterest
/ us-gaap_PartnerCapitalComponentsAxis
= atax_UnallocatedDeficitOfVariableInterestEntitiesMember
$ (16,886)us-gaap_PartnersCapitalIncludingPortionAttributableToNoncontrollingInterest
/ us-gaap_PartnerCapitalComponentsAxis
= us-gaap_NoncontrollingInterestMember
$ 50,064,958us-gaap_PartnersCapitalIncludingPortionAttributableToNoncontrollingInterest
/ us-gaap_PartnerCapitalComponentsAxis
= us-gaap_AccumulatedOtherComprehensiveIncomeMember