Statements of Operations of Discontinued Operations (Detail) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Revenue:
Property income									$ 117,306	$ 109,574	$ 49,171
Fee and other income:
Property reimbursement revenue									4,689	975	1,404
Fee and other income									4,792	1,818	891
Total fee and other income									9,481	2,793	2,295
Total revenue									126,787	112,367	51,466
Expenses:
Interest expense									27,937	22,588	7,531
Real estate operating expense									48,352	46,275	21,636
Compensation expense									10,490	6,248	6,082
General and administrative expense									3,916	3,381	1,651
Acquisition expense									489	14,195	1,832
Depreciation and amortization expense									27,500	28,363	12,778
Total expenses									118,684	121,050	51,510
Operating (Loss) Income									8,103	(8,683)	(44)
Interest and other income (expense), net									(3)	75	17
Gains (losses) on assets									32,264	6,412	2,882
Gain (loss) on IRT merger with TSRE									732	64,604
TSRE financing extinguishment and employee separation expenses										(27,508)
Gains (losses) on extinguishments of debt									(952)
Net income (loss) from discontinued operations	$ 1,671	$ 4,112	$ 32,876	$ 1,485	$ 6,069	$ 27,004	$ 1,255	$ 572	$ 40,144	$ 34,900	$ 2,855