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Segment Information - Financial Information by Major Geographic Area (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Revenue:                      
Total revenue $ 296,916 $ 358,163 $ 363,677 $ 277,428 $ 277,285 $ 339,099 $ 364,774 $ 325,807 $ 1,296,184 $ 1,306,965 $ 1,204,970
Long-lived assets:                      
Total long-lived assets 376,757       353,083       376,757 353,083 324,155
U.S.                      
Revenue:                      
Total revenue                 894,442 913,210 855,304
Long-lived assets:                      
Total long-lived assets 182,140       180,345       182,140 180,345 182,611
EMEA                      
Revenue:                      
Total revenue                 218,247 209,824 205,028
Long-lived assets:                      
Total long-lived assets 48,553       43,630       48,553 43,630 37,083
Canada                      
Revenue:                      
Total revenue                 183,495 183,931 144,638
Long-lived assets:                      
Total long-lived assets $ 146,064       $ 129,108       $ 146,064 $ 129,108 $ 104,461