Investments in Unconsolidated Real Estate Entities - Schedule of Unconsolidated Entities (Details) - USD ($) $ in Thousands	3 Months Ended				6 Months Ended
	Jun. 30, 2021	Mar. 31, 2021	Jun. 30, 2020	Mar. 31, 2020	Jun. 30, 2021	Jun. 30, 2020	Dec. 31, 2020	Dec. 31, 2019
Balance Sheet
Total assets	$ 248,557		$ 162,838		$ 248,557	$ 162,838	$ 162,838
Total liabilities	(96,441)				(96,441)		(74,412)
Total equity of unconsolidated real estate entities	(3,053)	$ 12,226	(1,356)	$ (1,003)	(3,053)	(1,356)	5,232	$ 200
INREIT investment in unconsolidated real estate entities	98,591				98,591		89,284
Operating Data
Total revenues	2,569		0		4,747	0
Income (loss) from unconsolidated real estate entities	(2,408)	$ 36	(353)	$ (1,203)	(2,372)	(1,556)
Income (loss) from unconsolidated real estate entities	(228)		$ 0		1,503	$ 0
Vida JV LLC
Balance Sheet
Total assets	413,922				413,922		366,482
Total liabilities	(219,047)				(219,047)		(187,882)
Total equity of unconsolidated real estate entities	194,875				194,875		178,600
INREIT's share	82,822				82,822		75,914
INREIT outside basis	249				249		252
INREIT investment in unconsolidated real estate entities	83,071				83,071		76,166
Operating Data
Total revenues	9,251				17,840
Income (loss) from unconsolidated real estate entities	(1,643)				1,388
INREIT's share	(697)				590
Amortization of INREIT outside basis	(2)				(5)
Income (loss) from unconsolidated real estate entities	(699)				585
San Simeon Holdings
Balance Sheet
Total assets	114,989				114,989		112,594
Total liabilities	(78,136)				(78,136)		(76,322)
Total equity of unconsolidated real estate entities	36,853				36,853		36,272
INREIT's share	15,520				15,520		13,118
INREIT outside basis	0				0		0
INREIT investment in unconsolidated real estate entities	15,520				15,520		13,118
Operating Data
Total revenues	2,123				4,379
Income (loss) from unconsolidated real estate entities	(495)				(719)
INREIT's share	471				918
Amortization of INREIT outside basis	0				0
Income (loss) from unconsolidated real estate entities	471				918
Vida JV LLC And San Simeon Holdings
Balance Sheet
Total assets	528,911				528,911		479,076
Total liabilities	(297,183)				(297,183)		(264,204)
Total equity of unconsolidated real estate entities	231,728				231,728		214,872
INREIT's share	98,342				98,342		89,032
INREIT outside basis	249				249		252
INREIT investment in unconsolidated real estate entities	98,591				98,591		$ 89,284
Operating Data
Total revenues	11,374				22,219
Income (loss) from unconsolidated real estate entities	(2,138)				669
INREIT's share	(226)				1,508
Amortization of INREIT outside basis	(2)				(5)
Income (loss) from unconsolidated real estate entities	$ (228)				$ 1,503