Schedule III - Real Estate and Accumulated Depreciation 1 (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Balance at beginning of year	$ 4,722,162
Balance at end of year	6,392,487	$ 4,722,162
Accumulated depreciation:
Balance at beginning of year	604,336
Balance at end of year	728,087	604,336
Real estate under development/redevelopment:
Net real estate assets	5,689,309	4,135,696	$ 3,636,544
Aggregate cost of real estate for U.S. federal income tax purposes	5,758,588
Operating Facilities [Member]
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Balance at beginning of year	4,722,162	4,126,648	3,379,512
Acquisitions	1,609,608	557,158	711,710
Improvements	46,696	32,861	37,949
Transfers from construction in progress	19,971	12,308	3,643
Dispositions and other	(5,950)	(6,813)	(6,166)
Balance at end of year	6,392,487	4,722,162	4,126,648
Accumulated depreciation:
Balance at beginning of year	604,336	496,754	391,928
Depreciation expense	123,751	109,531	104,963
Dispositions and other	0	(1,949)	(137)
Balance at end of year	728,087	604,336	496,754
Real Estate Under Development/Redevelopment [Member]
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Balance at beginning of year	17,870	6,650	4,138
Current development	27,010	23,528	6,466
Transfers from construction in progress	(19,971)	(12,308)	(3,954)
Balance at end of year	$ 24,909	$ 17,870	$ 6,650