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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