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Software and Other Intangible Assets - Summary of Carrying Amount and Accumulated Amortization of Other Intangible Assets (Details) - USD ($) $ in Thousands | Mar. 31, 2021 | Dec. 31, 2020
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Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | $ 534,921 | $ 536,504
Accumulated Amortization | (222,946) | (214,521)
Total | 311,975 | 321,983
Software for resale |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 130,560 | 130,261
Accumulated Amortization | (125,683) | (123,418)
Total | 4,877 | 6,843
Software for internal use |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 437,776 | 430,330
Accumulated Amortization | (251,713) | (240,717)
Total | 186,063 | 189,613
Software |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 568,336 | 560,591
Accumulated Amortization | (377,396) | (364,135)
Total | 190,940 | 196,456
Customer relationships |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 510,927 | 512,389
Accumulated Amortization | (205,786) | (197,787)
Total | 305,141 | 314,602
Trademarks and tradenames |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 23,994 | 24,115
Accumulated Amortization | (17,160) | (16,734)
Total | $ 6,834 | $ 7,381

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