Segment Information - Schedule of Selected Information for Each Business Segment (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Revenues
Revenues	$ 77,966	$ 73,314	$ 154,440	$ 148,137
Revenues	77,966	73,314	154,440	148,137
Operating income
Operating income	14,179	5,356	31,852	16,734
Interest expense, net	(6,978)	(13,876)	(13,996)	(24,499)
Loss on extinguishment of debt		(15,528)		(15,528)
Other income, net	396	800	454	417
Income (Loss) before income taxes	7,597	(23,248)	18,310	(22,876)
U.S. [Member]
Revenues
Revenues	65,134	58,378	130,067	119,045
Revenues	65,134	58,378	130,067	119,045
International [Member]
Revenues
Revenues	12,832	14,936	24,373	29,092
Revenues	12,832	14,936	24,373	29,092
Operating Segments [Member]
Revenues
Revenues	85,076	79,625	167,387	159,569
Revenues	85,076	79,625	167,387	159,569
Operating income
Operating income	14,488	5,501	32,026	16,706
Operating Segments [Member] | U.S. [Member]
Revenues
Revenues	72,244	64,689	143,014	130,477
Revenues	72,244	64,689	143,014	130,477
Operating income
Operating income	15,931	3,442	29,335	16,121
Operating Segments [Member] | International [Member]
Revenues
Revenues	12,832	14,936	24,373	29,092
Revenues	12,832	14,936	24,373	29,092
Operating income
Operating income	(1,443)	2,059	2,691	585
Inter-Segment [Member]
Revenues
Revenues	(7,110)	(6,311)	(12,947)	(11,432)
Revenues	(7,110)	(6,311)	(12,947)	(11,432)
Operating income
Operating income	$ (309)	$ (145)	$ (174)	$ 28