Schedule III - Changes in Total Real Estate Assets (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
SEC Schedule III, Real Estate and Accumulated Depreciation Disclosure [Abstract]
Balance at beginning of period	$ 2,991,590	$ 2,040,727	$ 1,733,194
Acquisitions	745,948	975,239	263,811
Transfers from construction in progress	163,080	23,163	41,772
Additions	33,279	7,376	84,831
Dispositions	(138,886)	(24,701)	(56,590)
Other	173,031	(30,214)	(26,291)
Balance at end of period	$ 3,968,042	$ 2,991,590	$ 2,040,727