Segment Reporting - Summary of Revenues, Gross Profit and Operating Income (Loss) by Geographic Region (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	$ 297,686	$ 337,096	$ 591,594	$ 646,262
Gross profit	61,190	72,053	115,604	131,243
Operating income (loss)	8,145	14,523	4,006	23,648
United States
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	227,784	252,834	451,353	475,975
Gross profit	47,791	54,639	87,652	92,493
Operating income (loss)	5,145	10,644	145	7,724
Canada
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	27,333	39,400	54,952	86,052
Gross profit	5,856	8,491	11,271	20,680
Operating income (loss)	3,147	4,836	4,798	13,442
Europe
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	16,101	13,646	29,922	27,763
Gross profit	3,309	3,835	6,099	8,060
Operating income (loss)	616	469	756	1,940
Other foreign
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	26,468	31,216	55,367	56,472
Gross profit	4,234	5,088	10,582	10,010
Operating income (loss)	$ (763)	$ (1,426)	$ (1,693)	$ 542