Business Segments - Revenue by Geographic Area (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Segment Reporting Information [Line Items]
Net revenues from third parties									$ 1,029,353	$ 1,000,133	$ 890,960
Net revenues from other segments									0	0	0
Total net revenues	$ 270,311	$ 264,720	$ 252,227	$ 242,095	$ 246,641	$ 251,652	$ 260,350	$ 241,490	1,029,353	1,000,133	890,960
Adjusted EBITDA									51,896	42,838	26,901
Total assets	608,467				631,251				608,467	631,251	614,667
North America
Segment Reporting Information [Line Items]
Net revenues from third parties									708,532	688,942	657,989
Net revenues from other segments									7	48	33
Total net revenues									708,539	688,990	658,022
Adjusted EBITDA									64,612	57,662	51,873
Total assets	390,739				443,530				390,739	443,530	431,562
Latin America
Segment Reporting Information [Line Items]
Net revenues from third parties									95,939	99,734	88,016
Net revenues from other segments									1,422	429	1,270
Total net revenues									97,361	100,163	89,286
Adjusted EBITDA									6,380	5,273	3,098
Total assets	45,053				30,488				45,053	30,488	29,841
EMEA
Segment Reporting Information [Line Items]
Net revenues from third parties									224,882	211,457	144,955
Net revenues from other segments									7,269	5,160	75
Total net revenues									232,151	216,617	145,030
Adjusted EBITDA									8,655	5,893	764
Total assets	150,007				135,257				150,007	135,257	119,531
Other
Segment Reporting Information [Line Items]
Net revenues from third parties									0	0	0
Net revenues from other segments									(8,698)	(5,637)	(1,378)
Total net revenues									(8,698)	(5,637)	(1,378)
Adjusted EBITDA									(27,751)	(25,990)	(28,834)
Total assets	$ 22,668				$ 21,976				$ 22,668	$ 21,976	$ 33,733