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Revenue - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Disaggregation of Revenue [Line Items]
Services	$ 328,791	$ 326,968
United States
Disaggregation of Revenue [Line Items]
Services	263,017	256,524
Canada
Disaggregation of Revenue [Line Items]
Services	22,378	26,379
Other
Disaggregation of Revenue [Line Items]
Services	43,396	44,065
Food & Beverage
Disaggregation of Revenue [Line Items]
Services	66,663	64,285
Retail
Disaggregation of Revenue [Line Items]
Services	32,580	35,772
Consumer Products
Disaggregation of Revenue [Line Items]
Services	35,001	31,802
Communications
Disaggregation of Revenue [Line Items]
Services	39,798	29,657
Automotive
Disaggregation of Revenue [Line Items]
Services	18,191	20,494
Technology
Disaggregation of Revenue [Line Items]
Services	26,616	34,144
Healthcare
Disaggregation of Revenue [Line Items]
Services	23,297	33,170
Financials
Disaggregation of Revenue [Line Items]
Services	25,126	21,838
Transportation and Travel/Lodging
Disaggregation of Revenue [Line Items]
Services	17,441	14,848
Other
Disaggregation of Revenue [Line Items]
Services	$ 44,078	$ 40,958

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+ References

No definition available.

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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/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 22
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=115929826&loc=d3e8736-108599

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
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Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 32
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-URI http://asc.fasb.org/extlink&oid=115929826&loc=d3e8933-108599

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
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-Section 50
-Paragraph 22
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=115929826&loc=d3e8736-108599

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