Segment Reporting (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
Segment Reporting Information [Line Items]
Net interest margin										$ 53,397	$ 69,182	$ 103,109
Property income										112,836	124,157	113,110
Fee and other income										7,374	18,275	21,985
Provision for loan losses										(8,050)	(8,300)	(5,500)
Depreciation and amortization expense										(51,304)	(45,505)	(44,006)
Operating income										(45,774)	(8,378)	42,276
Change in fair value of financial instruments		$ 1,109	$ (1,375)	$ (1,592)	$ (4,088)	$ (1,828)	$ 620	$ 8,356	$ 4,490	(5,946)	11,638	(98,752)
Income tax benefit (provision)										(2,550)	(2,798)	2,147
Net income (loss)		$ 24,731	$ 9,440	$ 26,405	$ (10,503)	$ 11,960	$ 24,826	$ 26,441	$ 266	$ 50,073	$ 63,493	(289,975)
Continuing operations
Segment Reporting Information [Line Items]
Net interest margin												103,109
Property income												162,281
Fee and other income												24,280
Provision for loan losses												(5,500)
Depreciation and amortization expense												(56,784)
Operating income												42,232
Change in fair value of financial instruments												(98,752)
Income tax benefit (provision)												2,147
Net income (loss)												(289,975)
Continuing operations | Operating Segments | Owning and Management Segment
Segment Reporting Information [Line Items]
Net interest margin												100,197
Property income												113,110
Fee and other income												32,166
Provision for loan losses												(5,500)
Depreciation and amortization expense												(44,128)
Operating income												22,745
Change in fair value of financial instruments												7,841
Income tax benefit (provision)												2,643
Net income (loss)												40,396
Continuing operations | Operating Segments | Taberna Segment
Segment Reporting Information [Line Items]
Net interest margin												22,786
Fee and other income												980
Depreciation and amortization expense												(136)
Operating income												20,454
Change in fair value of financial instruments												(106,593)
Income tax benefit (provision)												(496)
Net income (loss)												(327,102)
Continuing operations | Operating Segments | IRT Segment
Segment Reporting Information [Line Items]
Property income	[1]											49,171
Depreciation and amortization expense	[1]											(12,520)
Operating income	[1]											45
Net income (loss)	[1]											2,944
Continuing operations | Eliminations
Segment Reporting Information [Line Items]
Net interest margin	[2]											(19,874)
Fee and other income	[2]											(8,866)
Operating income	[2]											(1,012)
Net income (loss)	[2]											$ (6,213)

[1] As discussed above, IRT became a discontinued operations during the year ended December 31, 2016 and, as such, is no longer a reportable segment.

[2] Certain transactions occurred between the reportable segments and between the reportable segments and IRT. These transactions included advisory and property management services as well as commercial real estate loans on owned real estate.