Schedule III - Real Estate Assets and Accumulated Depreciation Summary of Transactions (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015		Dec. 31, 2014	Dec. 31, 2013
SEC Schedule III, Real Estate Assets and Accumulated Depreciation [Line Items]
Investment in Real Estate, balance at beginning of period	$ 3,071,094		$ 3,078,902	$ 3,049,672
Additions through Capital Expenditures	433,481		45,929	18,106
Acquisitions	131,348			12,270
Sale of real estate for cash			(4,368)	(554)
Asset impairments			(49,247)
Reclassifications and other	(93,900)		(122)	(592)
Investment in Real Estate, balance at end of period	3,542,023	[1]	3,071,094	3,078,902
Accumulated Depreciation, balance at beginning of period	(815,980)		(755,761)	(680,965)
Depreciation	(113,611)		(79,745)	(75,069)
Disposals/Other	95,033		118	273
Asset impairments			19,408
Accumulated Depreciation, balance at end of period	$ (834,558)	[2]	$ (815,980)	$ (755,761)

[1] The aggregate cost of properties for federal income tax purposes is approximately $3.4 billion at December 31, 2015.

[2] Depreciation is calculated using estimated useful lives of depreciable assets up to 50 years for prison facilities.