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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, 2020 | Dec. 31, 2019
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Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | $ 528,129 | $ 535,097
Accumulated Amortization | (183,973) | (178,128)
Total | 344,156 | 356,969
Software for resale |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 136,739 | 138,823
Accumulated Amortization | (122,317) | (122,061)
Total | 14,422 | 16,762
Software for internal use |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 405,794 | 400,065
Accumulated Amortization | (195,045) | (182,310)
Total | 210,749 | 217,755
Software |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 542,533 | 538,888
Accumulated Amortization | (317,362) | (304,371)
Total | 225,171 | 234,517
Customer relationships |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 501,039 | 507,785
Accumulated Amortization | (166,172) | (160,775)
Total | 334,867 | 347,010
Trademarks and tradenames |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 27,090 | 27,312
Accumulated Amortization | (17,801) | (17,353)
Total | $ 9,289 | $ 9,959

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