Schedule III - Changes in Total Real Estate Assets (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
SEC Schedule III, Real Estate and Accumulated Depreciation Disclosure [Abstract]
Balance at beginning of period	$ 2,040,727	$ 1,733,194	$ 1,189,552
Acquisitions	975,239	263,811	480,503
Transfers from construction in progress	23,163	41,772	81,347
Additions	7,376	84,831	7,749
Dispositions	(24,701)	(56,590)	(28,616)
Other	(30,214)	(26,291)	2,659
Balance at end of period	$ 2,991,590	$ 2,040,727	$ 1,733,194