Debt - Schedule of Debt (Detail) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Line of Credit Facility
Debt, Long-term and Short-term, Combined Amount	$ 491,705	$ 495,086
Debt Instrument, Unamortized Discount	(1,696)	(2,078)
Unamortized Debt Issuance Expense	(5,874)	(7,211)
Long-term Debt, Current Maturities	(3,330)	(3,329)
Long-term debt	488,375	491,757
Revolving Credit Facility
Line of Credit Facility
Debt, Long-term and Short-term, Combined Amount	0	0
Senior Secured Credit Facility
Line of Credit Facility
Debt, Long-term and Short-term, Combined Amount	$ 499,275	$ 504,375