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, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	$ 354,473	$ 297,686	$ 679,648	$ 591,594
Gross profit	79,768	61,190	147,180	115,604
Operating income (loss)	21,659	8,145	35,792	4,006
United States
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	278,507	227,784	536,231	451,353
Gross profit	66,703	47,791	122,734	87,652
Operating income (loss)	19,614	5,145	32,131	145
Canada
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	29,287	27,333	56,114	54,952
Gross profit	6,090	5,856	10,604	11,271
Operating income (loss)	2,478	3,147	3,938	4,798
Europe
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	18,144	16,101	34,289	29,922
Gross profit	3,266	3,309	6,425	6,099
Operating income (loss)	(220)	616	188	756
Other foreign
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	28,535	26,468	53,014	55,367
Gross profit	3,709	4,234	7,417	10,582
Operating income (loss)	$ (213)	$ (763)	$ (465)	$ (1,693)