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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, 2020 | Dec. 31, 2019
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Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | $ 533,655 | $ 535,097
Accumulated Amortization | (205,398) | (178,128)
Total | 328,257 | 356,969
Software for resale |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 138,017 | 138,823
Accumulated Amortization | (127,535) | (122,061)
Total | 10,482 | 16,762
Software for internal use |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 424,054 | 400,065
Accumulated Amortization | (230,297) | (182,310)
Total | 193,757 | 217,755
Software |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 562,071 | 538,888
Accumulated Amortization | (357,832) | (304,371)
Total | 204,239 | 234,517
Customer relationships |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 506,270 | 507,785
Accumulated Amortization | (185,981) | (160,775)
Total | 320,289 | 347,010
Trademarks and tradenames |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 27,385 | 27,312
Accumulated Amortization | (19,417) | (17,353)
Total | $ 7,968 | $ 9,959

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