Equity - Summary of the Components of Changes in Accumulated Other Comprehensive Loss (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning Balance	$ 962,140	$ 693,744
Other comprehensive income before reclassifications	304	(2,258)
Amounts reclassified from accumulated other comprehensive income to interest expense	448	501
Net current period other comprehensive income	752	(1,757)
Less other comprehensive income attributable to noncontrolling interests	(21)	62
Ending Balance	962,142	686,501
Accumulated Other Comprehensive Income
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning Balance	3,445	(3,033)
Net current period other comprehensive income	731	(1,695)
Other comprehensive income attributable to common stockholders	731	(1,695)
Ending Balance	$ 4,176	$ (4,728)