Schedule III - Changes in Accumulated Depreciation (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	$ 407,349	[1]	$ 292,786		$ 232,675
Depreciation	115,497		109,307		81,010
Depreciation on disposed property	(101,967)		(1,438)		(19,086)
Other	(6,548)		6,694		(1,813)
Balance at end of period	$ 414,331		$ 407,349	[1]	$ 292,786

[1] Includes $0.5 million of accumulated depreciation reflected in real estate held for sale at December 31, 2017. Excludes accumulated amortization related to intangible lease assets that are included in real estate held for sale of $0.1 million at December 31, 2017.