Schedule III - Changes in Total Real Estate Assets (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018		Dec. 31, 2017		Dec. 31, 2016
Real Estate And Accumulated Depreciation Disclosure [Abstract]
Balance at beginning of period	$ 5,438,148	[1]	$ 3,968,042		$ 2,991,590
Acquisitions	758,619		1,256,245		745,948
Transfers from construction in progress	25,513		74,441		163,080
Additions	96,775		36,828		33,279
Dispositions	(1,318,238)		(53,372)		(138,886)
Other	(219,668)	[2]	155,964	[2]	173,031
Balance at end of period	$ 4,781,149		$ 5,438,148	[1]	$ 3,968,042

[1] Includes $131.4 million of land and building cost reflected in real estate held for sale at December 31, 2017. Excludes intangible lease assets that are included in real estate held for sale of $15.8 million at December 31, 2017.

[2] Represents foreign currency fluctuations and purchase price allocation adjustments.