Derivative Instruments and Hedging Activities - Schedule of Changes in Accumulated Other Comprehensive Loss (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Accumulated other comprehensive loss:
Beginning Balance	$ 504,120	$ 579,535
Ending Balance	461,215	504,120
Gains (Losses) on Cash Flow Hedges [Member]
Accumulated other comprehensive loss:
Beginning Balance	(13,137)	(483)
Other comprehensive loss before reclassifications	(1,690)	(14,781)
Amounts reclassified from accumulated other comprehensive loss to interest expense	1,133	2,127
Unrealized loss on derivatives, net of tax	(557)	(12,654)
Ending Balance	$ (13,694)	$ (13,137)