Equity - Summary of the Components of Changes in Accumulated Other Comprehensive Loss (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning Balance			$ 962,140	$ 693,744
Other comprehensive income before reclassifications			(1,054)	(5,501)
Amounts reclassified from accumulated other comprehensive income to interest expense			810	1,094
Net current period other comprehensive income	$ (996)	$ (2,650)	(244)	(4,407)
Less other comprehensive income attributable to noncontrolling interests			15	(112)
Ending Balance	1,084,978	862,784	1,084,978	862,784
Accumulated Other Comprehensive Income (Loss)
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning Balance			3,445	(3,033)
Net current period other comprehensive income			(229)	(4,295)
Other comprehensive income attributable to common stockholders			(229)	(4,295)
Ending Balance	$ 3,216	$ (7,328)	$ 3,216	$ (7,328)