Consolidated Balance Sheets (USD $)	Dec. 31, 2014	Dec. 31, 2013
Assets [Abstract]
Cash and cash equivalents	$ 49,193,343	$ 11,318,015
Restricted cash	11,685,729	6,845,543
Interest receivable	4,121,486us-gaap_InterestReceivable	3,342,038us-gaap_InterestReceivable
Available-for-sale Securities, Fair Value Disclosure Held in Trust	378,423,092	216,371,801
Available-for-sale Securities	70,601,045us-gaap_AvailableForSaleSecurities	68,946,370us-gaap_AvailableForSaleSecurities
Public housing capital fund trusts, at fair value	61,263,123	62,056,379
Mortgage backed securities, at fair value	14,841,558	37,845,661
Real estate assets: (Note 6)
Land and land improvements	15,589,893us-gaap_LandAndLandImprovements	11,081,992us-gaap_LandAndLandImprovements
Buildings and improvements	131,910,221	111,195,695
Real estate assets before accumulated depreciation	147,500,114us-gaap_PropertyPlantAndEquipmentGross	122,277,687us-gaap_PropertyPlantAndEquipmentGross
Accumulated depreciation	(24,691,800)	(19,128,753)
Net real estate assets	122,808,314us-gaap_PropertyPlantAndEquipmentNet	103,148,934us-gaap_PropertyPlantAndEquipmentNet
Other assets (Note 7)	31,301,527us-gaap_OtherAssets	24,358,291us-gaap_OtherAssets
Total assets	744,239,217us-gaap_Assets	534,233,032us-gaap_Assets
Liabilities
Accounts payable, accrued expenses and other liabilities	4,627,089	5,450,694
Distribution payable	7,617,390us-gaap_DividendsPayableCurrent	6,446,076us-gaap_DividendsPayableCurrent
Debt financing	345,359,000atax_DebtFinancing	257,274,000atax_DebtFinancing
Mortgages payable	76,707,834us-gaap_LongTermDebt	57,087,320us-gaap_LongTermDebt
Bond Purchase Commitment - Fair Market Value Adjustment - Liability	0	4,852,177
Total Liabilities	434,311,313us-gaap_Liabilities	331,110,267us-gaap_Liabilities
Commitments and Contingencies (Note 15)
Partners' Capital
General Partner	578,238us-gaap_GeneralPartnersCapitalAccount	16,671us-gaap_GeneralPartnersCapitalAccount
Beneficial Unit Certificate holders	330,457,117us-gaap_LimitedPartnersCapitalAccount	223,573,312us-gaap_LimitedPartnersCapitalAccount
Unallocated deficit of Consolidated VIEs	(21,091,456)	(20,455,896)
Total Partners' Capital	309,943,899us-gaap_PartnersCapital	203,134,087us-gaap_PartnersCapital
Noncontrolling interest	(15,995)	(11,322)
Total Capital	309,927,904	203,122,765
Total Liabilities and Partners' Capital	$ 744,239,217	$ 534,233,032

This element represents the portion of the balance sheet assertion valued at fair value by the entity, which is held in trust, whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may by ued in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This item represents Available-for-sale Securities which consist of all investments in certain debt and equity securities neither classified as trading or held-to-maturity securities. A debt security represents a creditor relationship with an enterprise. Debt securities include, among other items, US Treasury securities, US government securities, municipal securities, corporate bonds, convertible debt, commercial paper, and all sescuritized debt instruments. An equity security represents an ownership interest in an enterprise or the right to acquire or dispose of an ownership interest in an enterprise at fixed or determinable prices. Equity securities include, among other things, common stock, certain preferred stock, warrant rights, call options, and put options, but do not include convertible debt. An entity may opt to provide the reader with additional narrative text to better understand the nature of investments in debt and equity securities which are categorized as Available-for-sale.

No definition available.