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Goodwill and Identifiable Intangible Assets - Schedule of Finite-lived and Indefinite-lived Intangible Assets (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
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Schedule of Finite-lived and Indefinite-lived Intangible Assets [Line Items] |  |
Accumulated Amortization | $ (383,316) | $ (341,666)
Total | 330,679 |
Gross Carrying Amount, Trade names (unamortized) | 209,840 | 198,739
Accumulated Impairment Charge, Trade names (unamortized) | (52,233) | (52,233)
Total, Trade names (unamortized) | 157,607 | 146,506
Gross Carrying Amount, Total | 928,669 | 893,769
Accumulated Impairment Charge, Total | (57,067) | (57,067)
Total | 488,286 | 495,036
Contract backlog |  |
Schedule of Finite-lived and Indefinite-lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 58,945 | 55,545
Accumulated Amortization | (56,812) | (55,229)
Accumulated Impairment Charge | 0 | 0
Total | 2,133 | 316
Developed technology/Vendor network |  |
Schedule of Finite-lived and Indefinite-lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 95,661 | 95,661
Accumulated Amortization | (55,318) | (50,479)
Accumulated Impairment Charge | 0 | 0
Total | 40,343 | 45,182
Customer relationships |  |
Schedule of Finite-lived and Indefinite-lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 522,855 | 500,756
Accumulated Amortization | (240,073) | (206,319)
Accumulated Impairment Charge | (4,834) | (4,834)
Total | 277,948 | 289,603
Non-competition agreements |  |
Schedule of Finite-lived and Indefinite-lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 10,220 | 10,220
Accumulated Amortization | (10,220) | (10,178)
Accumulated Impairment Charge | 0 | 0
Total | 0 | 42
Trade names (amortized) |  |
Schedule of Finite-lived and Indefinite-lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 31,148 | 32,848
Accumulated Amortization | (20,893) | (19,461)
Accumulated Impairment Charge | 0 | 0
Total | $ 10,255 | $ 13,387

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