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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, 2021 | Dec. 31, 2020
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Schedule of Finite-lived and Indefinite-lived Intangible Assets [Line Items] |  |
Accumulated Amortization | $ (545,277) | $ (481,188)
Total | 373,577 |
Indefinite-Lived Trade Names, Accumulated Impairment Charge | 58,933 | 58,933
Gross Carrying Amount, Trade names (unamortized) | 274,721 | 258,471
Total, Trade names (unamortized) | 215,788 | 199,538
Gross Carrying Amount, Total | 1,198,409 | 1,127,848
Accumulated Impairment Charge, Total | (63,767) | (63,767)
Total | 589,365 | 582,893
Customer relationships |  |
Schedule of Finite-lived and Indefinite-lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 717,666 | 670,155
Accumulated Amortization | (374,764) | (324,426)
Accumulated Impairment Charge | (4,834) | (4,834)
Total | 338,068 | 340,895
Developed technology/Vendor network |  |
Schedule of Finite-lived and Indefinite-lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 95,661 | 95,661
Accumulated Amortization | (69,688) | (64,994)
Accumulated Impairment Charge | 0 | 0
Total | 25,973 | 30,667
Trade names (amortized) |  |
Schedule of Finite-lived and Indefinite-lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 32,366 | 31,516
Accumulated Amortization | (24,180) | (23,002)
Accumulated Impairment Charge | 0 | 0
Total | 8,186 | 8,514
Contract backlog |  |
Schedule of Finite-lived and Indefinite-lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 77,995 | 72,045
Accumulated Amortization | (76,645) | (68,766)
Accumulated Impairment Charge | 0 | 0
Total | $ 1,350 | $ 3,279

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