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Segment Information - Revenues By Region (Details) - USD ($) | 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
Revenues from External Customers [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total revenues | $ 628,383,000 | $ 624,474,000 | $ 635,037,000 | $ 614,576,000 | $ 587,044,000 | $ 595,962,000 | $ 585,890,000 | $ 607,221,000 | $ 2,502,470,000 | $ 2,376,117,000 | $ 2,018,197,000
United States and Canada [Member] |  |  |  |  |  |  |  |  |  |  |
Revenues from External Customers [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total revenues |  |  |  |  |  |  |  |  | 1,629,742,000 | 1,442,792,000 | 1,137,508,000
EMEA [Member] |  |  |  |  |  |  |  |  |  |  |
Revenues from External Customers [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total revenues |  |  |  |  |  |  |  |  | 663,851,000 | 733,732,000 | 672,942,000
Other Countries [Member] |  |  |  |  |  |  |  |  |  |  |
Revenues from External Customers [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total revenues |  |  |  |  |  |  |  |  | $ 208,877,000 | $ 199,593,000 | $ 207,747,000

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