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Goodwill and Identifiable Intangible Assets - Schedule of Finite-lived and Indefinite-lived Intangible Assets (Details) - USD ($) $ in Thousands | Dec. 31, 2016 | Dec. 31, 2015
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Schedule of Finite-lived and Indefinite-lived Intangible Assets [Line Items] |  |
Accumulated Amortization | $ (293,072) | $ (252,164)
Total | 356,024 |
Gross Carrying Amount, Trade names (unamortized) | 183,239 | 174,039
Accumulated Impairment Charge, Trade names (unamortized) | (51,865) | (49,437)
Total, Trade names (unamortized) | 131,374 | 124,602
Gross Carrying Amount, Total | 837,169 | 779,269
Accumulated Impairment Charge, Total | (56,699) | (54,271)
Total | 487,398 | 472,834
Contract backlog |  |
Schedule of Finite-lived and Indefinite-lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 48,645 | 47,745
Accumulated Amortization | (48,412) | (47,745)
Accumulated Impairment Charge | 0 | 0
Total | 233 | 0
Developed technology/Vendor network |  |
Schedule of Finite-lived and Indefinite-lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 95,661 | 95,661
Accumulated Amortization | (45,616) | (40,482)
Accumulated Impairment Charge | 0 | 0
Total | 50,045 | 55,179
Customer relationships |  |
Schedule of Finite-lived and Indefinite-lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 466,556 | 430,356
Accumulated Amortization | (173,156) | (141,695)
Accumulated Impairment Charge | (4,834) | (4,834)
Total | 288,566 | 283,827
Non-competition agreements |  |
Schedule of Finite-lived and Indefinite-lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 10,220 | 10,220
Accumulated Amortization | (10,041) | (9,832)
Accumulated Impairment Charge | 0 | 0
Total | 179 | 388
Trade names (amortized) |  |
Schedule of Finite-lived and Indefinite-lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 32,848 | 21,248
Accumulated Amortization | (15,847) | (12,410)
Accumulated Impairment Charge | 0 | 0
Total | $ 17,001 | $ 8,838

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