Segment Information - Schedule of Selected Information for Each Business Segment (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Segment Reporting Information [Line Items]
Revenues	$ 81,359	$ 76,474
Operating income
Operating income	11,927	17,673
Interest expense	(5,420)	(7,024)
Loss on extinguishment of debt	(2,161)	0
Other income	577	64
Income before income taxes	4,923	10,713
Operating Segments [Member] | U.S. [Member]
Segment Reporting Information [Line Items]
Revenues	71,027	64,933
Operating income
Operating income	11,168	11,398
Operating Segments [Member] | International [Member]
Segment Reporting Information [Line Items]
Revenues	10,332	11,541
Operating income
Operating income	$ 759	$ 6,275