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Software and Other Intangible Assets - Summary of Carrying Amount and Accumulated Amortization of Other Intangible Assets (Details) - USD ($) $ in Thousands | Sep. 30, 2021 | Dec. 31, 2020
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Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | $ 532,703 | $ 536,504
Accumulated Amortization | (240,044) | (214,521)
Total | 292,659 | 321,983
Software for resale |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 129,771 | 130,261
Accumulated Amortization | (127,842) | (123,418)
Total | 1,929 | 6,843
Software for internal use |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 435,706 | 430,330
Accumulated Amortization | (270,699) | (240,717)
Total | 165,007 | 189,613
Software |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 565,477 | 560,591
Accumulated Amortization | (398,541) | (364,135)
Total | 166,936 | 196,456
Customer relationships |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 508,808 | 512,389
Accumulated Amortization | (221,889) | (197,787)
Total | 286,919 | 314,602
Trademarks and trade names |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 23,895 | 24,115
Accumulated Amortization | (18,155) | (16,734)
Total | $ 5,740 | $ 7,381

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