Segment Reporting - Summary of Revenues, Gross Profit and Operating Income (Loss) by Geographic Region (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	$ 308,524	$ 356,595	$ 900,118	$ 1,002,857
Gross profit	66,318	77,121	181,922	208,364
Operating income (loss)	20,505	24,938	24,511	48,586
United States
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	232,734	267,001	684,088	742,976
Gross profit	51,217	56,243	138,869	148,736
Operating income (loss)	15,402	11,464	15,547	19,188
Canada
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	39,161	45,340	94,113	131,391
Gross profit	8,373	9,998	19,644	30,677
Operating income (loss)	5,410	6,258	10,208	19,700
Europe
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	13,850	14,905	43,771	42,668
Gross profit	2,794	4,025	8,893	12,085
Operating income (loss)	352	570	1,108	2,511
Other foreign
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	22,779	29,349	78,146	85,822
Gross profit	3,934	6,855	14,516	16,866
Operating income (loss)	$ (659)	$ 6,646	$ (2,352)	$ 7,187