Segment Reporting - Summary of Revenues, Gross Profit and Operating Income (Loss) by Geographic Region (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	$ 276,904	$ 324,861
Gross profit	48,295	61,504
United States
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	208,775	236,530
Gross profit	31,827	40,707
Canada
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	24,068	28,839
Gross profit	3,454	4,775
Europe
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	16,003	16,009
Gross profit	3,519	1,134
Other foreign
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	28,058	43,483
Gross profit	$ 9,495	$ 14,888