| Goodwill and Intangible Assets (Details) (USD $) | 3 Months Ended | 9 Months Ended | |||
|---|---|---|---|---|---|
| Sep. 30, 2012 | Sep. 30, 2011 | Sep. 30, 2012 | Sep. 30, 2011 | Dec. 31, 2011 | |
| Goodwill [Roll Forward] | |||||
| Balance as of December 31, 2011 | $ 98,879,000 | ||||
| Impairment loss | (2,436,000) | ||||
| Balance as of September 30, 2012 | 96,443,000 | 96,443,000 | |||
| Trade Names [Member] | |||||
| Indefinite-lived Intangible Assets [Line Items] | |||||
| Trade names - indefinite lived | 2,430,000 | 2,430,000 | 2,430,000 | ||
| Impairment loss | (420,000) | ||||
| Net Intangible Assets | 2,010,000 | 2,010,000 | 2,430,000 | ||
| Contract-Related [Member] | |||||
| Finite-Lived Intangible Assets [Line Items] | |||||
| Contract-related | 96,884,000 | 96,884,000 | 96,884,000 | ||
| Accumulated Amortization | 19,749,000 | 19,749,000 | 12,987,000 | ||
| Impairment loss | (1,083,000) | ||||
| Net Intangible Assets | 76,052,000 | 76,052,000 | 83,897,000 | ||
| Acquired Technologies [Member] | |||||
| Finite-Lived Intangible Assets [Line Items] | |||||
| Contract-related | 12,400,000 | ||||
| Acquired technologies | 12,400,000 | 12,400,000 | |||
| Accumulated Amortization | 1,487,000 | 1,487,000 | 642,000 | ||
| Net Intangible Assets | 10,913,000 | 10,913,000 | 11,758,000 | ||
| Trade Names - Amortizable [Member] | |||||
| Finite-Lived Intangible Assets [Line Items] | |||||
| Contract-related | 9,170,000 | ||||
| Trade name - amortizable | 9,170,000 | 9,170,000 | |||
| Accumulated Amortization | 1,484,000 | 1,484,000 | 719,000 | ||
| Net Intangible Assets | 7,686,000 | 7,686,000 | 8,451,000 | ||
| Amortization of Intangible Assets | 2,800,000 | 2,800,000 | 8,400,000 | 5,100,000 | |
| Supply Chain Management Group [Member] | |||||
| Goodwill [Roll Forward] | |||||
| Balance as of December 31, 2011 | 61,169,000 | ||||
| Impairment loss | 0 | ||||
| Balance as of September 30, 2012 | 61,169,000 | 61,169,000 | |||
| IT, Energy and Management Consulting Group [Member] | |||||
| Goodwill [Roll Forward] | |||||
| Balance as of December 31, 2011 | 30,883,000 | ||||
| Impairment loss | 0 | ||||
| Balance as of September 30, 2012 | 30,883,000 | 30,883,000 | |||
| Infrastructure Group [Member] | |||||
| Goodwill [Roll Forward] | |||||
| Balance as of December 31, 2011 | 6,827,000 | ||||
| Impairment loss | (2,436,000) | ||||
| Balance as of September 30, 2012 | $ 4,391,000 | $ 4,391,000 | |||