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Goodwill, Identifiable Intangible Assets, And Other Long-Lived Assets - Schedule of Finite-lived and Indefinite-lived Intangible Assets (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
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Schedule of Finite-lived and Indefinite-lived Intangible Assets [Line Items] |  |
Accumulated Amortization | $ (481,188) | $ (421,238)
Total | 383,355 |
Gross Carrying Amount, Trade names (unamortized) | 258,471 | 251,440
Accumulated Impairment Charge, Trade names (unamortized) | (58,933) | (52,233)
Total, Trade names (unamortized) | 199,538 | 199,207
Gross Carrying Amount, Total | 1,127,848 | 1,089,749
Accumulated Impairment Charge, Total | (63,767) | (57,067)
Total | 582,893 | 611,444
Contract backlog |  |
Schedule of Finite-lived and Indefinite-lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 72,045 | 66,745
Accumulated Amortization | (68,766) | (61,651)
Accumulated Impairment Charge | 0 | 0
Total | 3,279 | 5,094
Developed technology/Vendor network |  |
Schedule of Finite-lived and Indefinite-lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 95,661 | 95,661
Accumulated Amortization | (64,994) | (60,156)
Accumulated Impairment Charge | 0 | 0
Total | 30,667 | 35,505
Customer relationships |  |
Schedule of Finite-lived and Indefinite-lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 670,155 | 644,755
Accumulated Amortization | (324,426) | (277,601)
Accumulated Impairment Charge | (4,834) | (4,834)
Total | 340,895 | 362,320
Trade names (amortized) |  |
Schedule of Finite-lived and Indefinite-lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 31,516 | 31,148
Accumulated Amortization | (23,002) | (21,830)
Accumulated Impairment Charge | 0 | 0
Total | $ 8,514 | $ 9,318

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