Derivative Instruments and Hedging Activities - Schedule of Changes in Accumulated Other Comprehensive Income (Loss), Net of Tax (Detail) $ in Thousands	6 Months Ended
	Jun. 30, 2019 USD ($)
Accumulated other comprehensive income (loss):
Beginning Balance	$ 265,194
Ending Balance	131,548
Accumulated Other Comprehensive Income [Member]
Accumulated other comprehensive income (loss):
Beginning Balance	2,284
Ending Balance	(2,646)
Gains (Losses) on Cash Flow Hedges [Member]
Accumulated other comprehensive income (loss):
Other comprehensive loss before reclassifications	(4,048)
Amounts reclassified from accumulated other comprehensive income (loss) to interest expense	(882)
Unrealized loss on derivatives, net of tax	$ (4,930)