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Revenue - Disaggregation of Revenue by Industry (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Disaggregation of Revenue [Line Items]                      
Revenues $ 2,276,549 $ 2,223,932 $ 2,244,993 $ 2,180,327 $ 2,260,155 $ 2,159,682 $ 2,089,904 $ 1,904,205 $ 8,925,801 $ 8,413,946 $ 7,280,074
Supply Chain Solutions                      
Disaggregation of Revenue [Line Items]                      
Revenues                 2,551,271 2,398,144 1,937,352
Supply Chain Solutions | Automotive                      
Disaggregation of Revenue [Line Items]                      
Revenues                 1,003,508 947,408 783,642
Supply Chain Solutions | Technology and healthcare                      
Disaggregation of Revenue [Line Items]                      
Revenues                 432,107 480,026 387,253
Supply Chain Solutions | CPG and retail                      
Disaggregation of Revenue [Line Items]                      
Revenues                 901,344 766,765 535,687
Supply Chain Solutions | Industrial and other                      
Disaggregation of Revenue [Line Items]                      
Revenues                 $ 214,312 $ 203,945 $ 230,770