Segment Reporting - Summary of Revenues, Gross Profit and Operating Income (Loss) by Geographic Region (Details) - USD ($) $ in Thousands	3 Months Ended
Mar. 31, 2018	Mar. 31, 2017
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	$ 324,861	$ 325,175
Gross profit	61,504	67,412
Operating income (loss)	3,181	14,133
United States
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	250,032	257,724
Gross profit	49,562	56,032
Operating income (loss)	4,913	12,517
Canada
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	28,839	26,827
Gross profit	4,775	4,514
Operating income (loss)	1,153	1,460
Europe
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	16,009	16,145
Gross profit	1,134	3,159
Operating income (loss)	(2,445)	408
Other foreign
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	29,981	24,479
Gross profit	6,033	3,707
Operating income (loss)	$ (440)	$ (252)

Aggregate revenue less cost of goods and services sold or operating expenses directly attributable to the revenue generation activity.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.1,2)
-URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688

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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.1)
-URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688

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