Debt Financing - Summary of Mizuho TOB Trust Financings (Details) - USD ($)		1 Months Ended	9 Months Ended
		Jul. 31, 2020	Sep. 30, 2021		Sep. 30, 2020	Dec. 31, 2020
Debt Instrument [Line Items]
Debt financing			$ 760,632,414			$ 673,957,640
TOB Trust [Member] | Mizuho Capital Markets [Member]
Debt Instrument [Line Items]
Debt financing			31,820,000	[1]	$ 171,293,000
Stated Maturities		2023-07
TOB Trust [Member] | Mizuho Capital Markets [Member] | TOB Trust 2021-XF2926 [Member]
Debt Instrument [Line Items]
Debt financing	[1],[2]		$ 16,190,000
Stated Maturities	[2]		2024-01
Reset Frequency	[2]		Weekly
Variable Rate Index	[2]		OBFR
Facility Fees	[2]		0.89%
TOB Trust [Member] | Mizuho Capital Markets [Member] | Hope on Avalon [Member]
Debt Instrument [Line Items]
Debt financing	[1]		$ 5,064,000
Stated Maturities			2023-02
Reset Frequency			Weekly
Variable Rate Index			SIFMA
Facility Fees			1.42%
TOB Trust [Member] | Mizuho Capital Markets [Member] | Hope on Broadway [Member]
Debt Instrument [Line Items]
Debt financing	[1]		$ 2,953,000
Stated Maturities			2023-02
Reset Frequency			Weekly
Variable Rate Index			SIFMA
Facility Fees			1.42%
TOB Trust [Member] | Mizuho Capital Markets [Member] | Jackson Manor Apartments [member]
Debt Instrument [Line Items]
Debt financing	[1]		$ 3,528,000
Stated Maturities			2023-04
Reset Frequency			Weekly
Variable Rate Index			SIFMA
Facility Fees			1.27%
TOB Trust [Member] | Mizuho Capital Markets [Member] | TOB Trust 2021-XF2939 [Member]
Debt Instrument [Line Items]
Debt financing	[1],[3]		$ 4,085,000
Stated Maturities	[3]		2024-07
Reset Frequency	[3]		Weekly
Variable Rate Index	[3]		OBFR
Facility Fees	[3]		1.16%
TOB Trust [Member] | Mizuho Capital Markets [Member] | Avistar at Copperfield - Series A [Member]
Debt Instrument [Line Items]
Debt financing					$ 11,818,000
Stated Maturities	[4]				2021-05
Reset Frequency					Weekly
Variable Rate Index					SIFMA
Facility Fees					1.67%
TOB Trust [Member] | Mizuho Capital Markets [Member] | Avistar at Wilcrest - Series A [Member]
Debt Instrument [Line Items]
Debt financing					$ 4,479,000
Stated Maturities	[4]				2021-05
Reset Frequency					Weekly
Variable Rate Index					SIFMA
Facility Fees					1.67%
TOB Trust [Member] | Mizuho Capital Markets [Member] | Avistar at Wood Hollow - Series A [Member]
Debt Instrument [Line Items]
Debt financing					$ 34,007,000
Stated Maturities	[4]				2021-05
Reset Frequency					Weekly
Variable Rate Index					SIFMA
Facility Fees					1.67%
TOB Trust [Member] | Mizuho Capital Markets [Member] | Gateway Village [Member]
Debt Instrument [Line Items]
Debt financing					$ 2,184,000
Stated Maturities	[4]				2021-05
Reset Frequency					Weekly
Variable Rate Index					SIFMA
Facility Fees					1.67%
TOB Trust [Member] | Mizuho Capital Markets [Member] | Lynnhaven [Member]
Debt Instrument [Line Items]
Debt financing					$ 2,898,000
Stated Maturities	[4]				2021-05
Reset Frequency					Weekly
Variable Rate Index					SIFMA
Facility Fees					1.67%
TOB Trust [Member] | Mizuho Capital Markets [Member] | Ocotillo Springs - Series A [Member]
Debt Instrument [Line Items]
Debt financing					$ 100,000
Stated Maturities					2022-07
Reset Frequency					Weekly
Variable Rate Index					SIFMA
Facility Fees					0.89%
TOB Trust [Member] | Mizuho Capital Markets [Member] | Oasis at Twin Lakes GIL [Member]
Debt Instrument [Line Items]
Debt financing	[5]				$ 10,440,000
Stated Maturities	[5]				2023-07
Reset Frequency	[5]				Weekly
Variable Rate Index	[5]				SIFMA
Facility Fees	[5]				0.89%
TOB Trust [Member] | Mizuho Capital Markets [Member] | Scharbauer Flats Apartments GIL [Member]
Debt Instrument [Line Items]
Debt financing	[5]				$ 36,000,000
Stated Maturities	[5]				2023-07
Reset Frequency	[5]				Weekly
Variable Rate Index	[5]				SIFMA
Facility Fees	[5]				0.89%
TOB Trust [Member] | Mizuho Capital Markets [Member] | Centennial Crossings GIL [Member]
Debt Instrument [Line Items]
Debt financing	[5]				$ 8,707,000
Stated Maturities	[5]				2023-08
Reset Frequency	[5]				Weekly
Variable Rate Index	[5]				SIFMA
Facility Fees	[5]				0.89%
TOB Trust [Member] | Mizuho Capital Markets [Member] | TOB Trust 2020-XF2907 [Member]
Debt Instrument [Line Items]
Debt financing	[5]				$ 55,870,000
Stated Maturities	[5]				2023-09
Reset Frequency	[5]				Weekly
Variable Rate Index	[5]				OBFR
Facility Fees	[5]				0.89%
TOB Trust [Member] | Mizuho Capital Markets [Member] | TOB Trust 2020-XF2908 [Member]
Debt Instrument [Line Items]
Debt financing					$ 4,790,000
Stated Maturities					2023-09
Reset Frequency					Weekly
Variable Rate Index					OBFR
Facility Fees					0.89%

[1] Amounts shown are the initial funding into the respective TOB Trusts. The balances will increase based upon subsequent fundings of the related securitized assets and the current outstanding balances are contained in the summarized debt financing table above

[2] The TOB Trust is a securitization of the Legacy Commons at Signal Hills GIL and property loan, Hilltop at Signal Hills GIL and property loan, Oasis at Twin Lakes property loan and Hope on Avalon taxable GIL

[3] The TOB Trust is a securitization of the Osprey Village GIL and property loan and the Ocotillo Spring Series A-T taxable MRB

[4] In July 2020, the Partnership extended the maturity date to July 2023

[5] Three TOB Trust financings associated with individual GILs were originated and subsequently collapsed during 2020. The three related GILs were then combined and re-securitized into a single TOB Trust financing in September 2020. The new TOB Trust financing was created to take advantage of lower interest rate spread adjustments compared to the previous TOB Trust financings. The termination of the single-GIL TOB Trust financings were treated as extinguishments for accounting purposes and the Partnership expensed approximately $364,000 of deferred financings costs