Long-Term Debt - Schedule of Interest Expense, Net (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Interest Expense [Line Items]
Other interest	$ 3	$ 7
Interest income	(128)	(58)
Total interest expense, net	19,980	20,306
Term Facility [Member]
Interest Expense [Line Items]
Interest expense	18,739	19,031
Amortization of deferred financing costs	999	970
Amortization of original issue discount	$ 367	$ 356