Segment Reporting - Summary of Revenues, Gross Profit and Operating Income (Loss) by Geographic Region (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
Mar. 31, 2015	Mar. 31, 2014
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	$ 309,166us-gaap_Revenues	$ 306,234us-gaap_Revenues
Gross profit	59,190us-gaap_GrossProfit	61,063us-gaap_GrossProfit
Operating income (loss)	9,125us-gaap_OperatingIncomeLoss	9,134us-gaap_OperatingIncomeLoss
United States [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	223,141	210,630
Gross profit	37,854	41,393
Operating income (loss)	(2,913)	2,396
Canada [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	46,651	41,864
Gross profit	12,188	9,062
Operating income (loss)	8,599	5,423
Europe [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	14,118	22,616
Gross profit	4,225	4,758
Operating income (loss)	1,471	527
Other Foreign Countries [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	25,256	31,124
Gross profit	4,923	5,850
Operating income (loss)	$ 1,968	$ 788

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

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- Definition

The net result for the period of deducting operating expenses from operating revenues.

+ References

No definition available.

+ Details

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- Definition

Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

+ 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=26872669&loc=d3e20235-122688

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 1

-Article 5

+ Details

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