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, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	$ 335,030	$ 354,473	$ 659,891	$ 679,648
Gross profit	71,053	79,768	132,557	147,180
Operating income (loss)	14,459	21,659	17,640	35,792
United States
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	266,875	278,507	516,908	536,231
Gross profit	58,599	66,703	108,162	122,734
Operating income (loss)	15,467	19,614	20,379	32,131
Canada
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	30,426	29,287	59,265	56,114
Gross profit	5,454	6,090	10,229	10,604
Operating income (loss)	1,962	2,478	3,115	3,938
Europe
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	15,846	18,144	31,855	34,289
Gross profit	1,401	3,266	2,535	6,425
Operating income (loss)	(3,605)	(220)	(6,050)	188
Other foreign
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	21,883	28,535	51,863	53,014
Gross profit	5,599	3,709	11,631	7,417
Operating income (loss)	$ 635	$ (213)	$ 196	$ (465)