Components of Long-Term Debt (Detail) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Schedule Of Long Term Debt [Line Items]
Secured Term Loans	$ 460,000	$ 464,000
Revolving Credit Facility	86,000	86,000
Unamortized deferred financing costs	(7,503)	(7,935)
Total long-term debt, net of unamortized deferred financing costs	538,497	542,065
Less: current portion of long-term debt	20,000	19,000
Long-term debt	$ 518,497	$ 523,065