Segments - Reconciliation of Total Segment EBITDA to Income Before Income Taxes (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Segment Reporting [Abstract]
Total Segment EBITDA	$ 33,694	$ 16,500	$ 102,750	$ 64,843
Depreciation and amortization	7,745	7,976	23,127	24,160
Other (expense) income	(204)	(1,815)	30	(2,627)
Income from operations	26,153	10,339	79,593	43,310
Interest expense, net	(6,291)	(6,556)	(18,819)	(17,872)
Income before income taxes	$ 19,658	$ 1,968	$ 60,804	$ 22,811