Segment Information - Income from Segments to Consolidated Net Income (Detail) - USD ($) $ in Thousands	3 Months Ended						9 Months Ended
	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Sep. 30, 2020	Sep. 30, 2019
Segment Reporting [Abstract]
Total EBITDA	$ 64,659			$ 52,397			$ 159,457	$ 160,442
Less:
Income tax expense	6,513			3,720			15,551	10,018
Interest expense, net	5,438			6,919			17,664	21,327
Depreciation and amortization	18,127			16,972			53,761	50,440
Net income	$ 34,581	$ 15,625	$ 22,275	$ 24,786	$ 27,137	$ 26,734	$ 72,481	$ 78,657