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, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	$ 341,872	$ 308,524	$ 1,021,520	$ 900,118
Gross profit	73,442	66,318	220,622	181,922
Operating income (loss)	(75,009)	20,505	(39,217)	24,511
United States
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	250,815	232,734	787,046	684,088
Gross profit	56,295	51,217	179,029	138,869
Operating income (loss)	(57,537)	15,402	(25,405)	15,547
Canada
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	41,939	39,161	98,053	94,113
Gross profit	9,099	8,373	19,703	19,644
Operating income (loss)	1,148	5,410	5,086	10,208
Europe
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	17,367	13,850	51,656	43,771
Gross profit	2,989	2,794	9,414	8,893
Operating income (loss)	(2,860)	352	(2,672)	1,108
Other foreign
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	31,751	22,779	84,765	78,146
Gross profit	5,059	3,934	12,476	14,516
Operating income (loss)	$ (15,760)	$ (659)	$ (16,226)	$ (2,352)