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Revenue - Disaggregation of Revenue (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2020 | Sep. 30, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Services | $ 328,168 | $ 283,423 | $ 259,678 | $ 327,742 | $ 381,975 | $ 342,907 | $ 362,130 | $ 328,791 | $ 1,199,011 | $ 1,415,803 | $ 1,475,088
United States |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Services |  |  |  |  |  |  |  |  | 959,636 | 1,116,045 | 1,152,399
Canada |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Services |  |  |  |  |  |  |  |  | 81,930 | 105,067 | 124,001
Other |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Services |  |  |  |  |  |  |  |  | 157,445 | 194,691 | 198,688
Food & Beverage |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Services |  |  |  |  |  |  |  |  | 205,939 | 280,094 | 313,368
Retail |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Services |  |  |  |  |  |  |  |  | 148,293 | 148,851 | 152,552
Consumer Products |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Services |  |  |  |  |  |  |  |  | 165,105 | 167,324 | 162,524
Communications |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Services |  |  |  |  |  |  |  |  | 77,443 | 184,870 | 178,410
Automotive |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Services |  |  |  |  |  |  |  |  | 67,339 | 78,985 | 88,807
Technology |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Services |  |  |  |  |  |  |  |  | 181,057 | 118,169 | 104,479
Healthcare |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Services |  |  |  |  |  |  |  |  | 100,727 | 102,221 | 127,547
Financials |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Services |  |  |  |  |  |  |  |  | 91,438 | 112,351 | 110,069
Transportation and Travel/Lodging |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Services |  |  |  |  |  |  |  |  | 44,510 | 88,958 | 86,419
Other |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Services |  |  |  |  |  |  |  |  | $ 117,160 | $ 133,980 | $ 150,913

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