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Goodwill and Identifiable Intangible Assets - Schedule of Finite-lived and Indefinite-lived Intangible Assets (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
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Schedule of Finite-lived and Indefinite-lived Intangible Assets [Line Items] |  |
Accumulated Amortization | $ (341,666) | $ (293,072)
Total | 348,530 |
Gross Carrying Amount, Trade names (unamortized) | 198,739 | 183,239
Accumulated Impairment Charge, Trade names (unamortized) | (52,233) | (51,865)
Total, Trade names (unamortized) | 146,506 | 131,374
Gross Carrying Amount, Total | 893,769 | 837,169
Accumulated Impairment Charge, Total | (57,067) | (56,699)
Total | 495,036 | 487,398
Contract backlog |  |
Schedule of Finite-lived and Indefinite-lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 55,545 | 48,645
Accumulated Amortization | (55,229) | (48,412)
Accumulated Impairment Charge | 0 | 0
Total | 316 | 233
Developed technology/Vendor network |  |
Schedule of Finite-lived and Indefinite-lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 95,661 | 95,661
Accumulated Amortization | (50,479) | (45,616)
Accumulated Impairment Charge | 0 | 0
Total | 45,182 | 50,045
Customer relationships |  |
Schedule of Finite-lived and Indefinite-lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 500,756 | 466,556
Accumulated Amortization | (206,319) | (173,156)
Accumulated Impairment Charge | (4,834) | (4,834)
Total | 289,603 | 288,566
Non-competition agreements |  |
Schedule of Finite-lived and Indefinite-lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 10,220 | 10,220
Accumulated Amortization | (10,178) | (10,041)
Accumulated Impairment Charge | 0 | 0
Total | 42 | 179
Trade names (amortized) |  |
Schedule of Finite-lived and Indefinite-lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 32,848 | 32,848
Accumulated Amortization | (19,461) | (15,847)
Accumulated Impairment Charge | 0 | 0
Total | $ 13,387 | $ 17,001

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