Interest Rate Swaps - Impact of Interest Rate Swaps on Consolidated Statements of Operations - (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Derivative [Line Items]
Amount of (loss) gain reclassified from AOCI into earnings under “Interest expense” (effective portion)	$ (362)	$ (593)	$ (810)	$ (1,094)
Amount of gain (loss) recognized in earnings under “Interest expense” (ineffective portion and amount excluded from effectiveness testing)	0	0	0	$ 0
Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent
Derivative [Line Items]
Amount of gain (loss) recognized in AOCI on derivatives (effective portion)	$ (1,358)	$ (3,243)	$ (1,054)