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Goodwill and Intangible Assets (Details) (USD $) | 3 Months Ended | 6 Months Ended | 9 Months Ended |  | 9 Months Ended | 12 Months Ended | 9 Months Ended | 12 Months Ended | 9 Months Ended | 12 Months Ended | 9 Months Ended | 12 Months Ended | 9 Months Ended | 12 Months Ended |  | 9 Months Ended |  | 9 Months Ended |  | 9 Months Ended |  | 9 Months Ended |
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Sep. 30, 2012 | Jun. 30, 2012 | Dec. 31, 2011 | Sep. 30, 2011 | Jun. 30, 2012 | Sep. 30, 2012 | Sep. 30, 2011 | Sep. 30, 2012 | Sep. 30, 2012 Trade Names (amortizable) [Member] | Dec. 31, 2011 Trade Names (amortizable) [Member] | Sep. 30, 2012 Customer Relationships [Member] | Dec. 31, 2011 Customer Relationships [Member] | Sep. 30, 2012 Construction Contract Backlog [Member] | Dec. 31, 2011 Construction Contract Backlog [Member] | Sep. 30, 2012 Trade Names (Non-amortizable) [Member] | Dec. 31, 2011 Trade Names (Non-amortizable) [Member] | Sep. 30, 2012 Contractor License [Member] | Dec. 31, 2011 Contractor License [Member] | Sep. 30, 2012 Minimum [Member] | Sep. 30, 2012 Maximum [Member] | Sep. 30, 2012 Building Group [Member] | Sep. 30, 2012 Building Group [Member] | Sep. 30, 2012 Civil [Member] | Sep. 30, 2012 Civil [Member] | Sep. 30, 2012 Specialty Contractors [Member] | Sep. 30, 2012 Specialty Contractors [Member] | Sep. 30, 2012 Management Services [Member] | Sep. 30, 2012 Management Services [Member]
Goodwill and Intangible Assets [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Indefinite lived intangible assets impairment charge |  |  |  |  | $ 16,400,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Finite lived intangible assets impairment charge |  |  |  |  | 39,100,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Implied market control premium (in hundredths) |  | 42.50% | 78.10% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of years an acceptable range of market transactions have been observed in the construction and engineering industry |  |  |  |  |  | 7 years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted-average cost of capital rate (in hundredths) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 15.00% | 16.50% |  |  |  |  |  |  |  |
Gross goodwill |  |  |  |  |  |  |  | 1,059,500,000 |  |  |  |  |  |  |  |  |  |  |  |  |  | 420,267,000 |  | 430,762,000 |  | 141,833,000 |  | 66,638,000
Accumulated impairment |  |  |  |  |  |  |  | (166,898,000) |  |  |  |  |  |  |  |  |  |  |  |  |  | (146,847,000) |  | 0 |  | 0 |  | (20,051,000)
Balance at beginning of period |  |  |  |  | 892,602,000 | 892,602,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 273,420,000 |  | 430,762,000 |  | 141,833,000 |  | 46,587,000 |
Acquisition related adjustment |  |  |  |  |  | (869,000) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 |  | (869,000) |  | 0 |  | 0 |
Impairment charge |  |  |  |  | (321,100,000) | (321,087,000) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (262,918,000) |  | (55,740,000) |  | 0 |  | (2,429,000) |
Balance at end of period | 570,646,000 |  | 892,602,000 |  |  | 570,646,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 10,502,000 |  | 374,153,000 |  | 141,833,000 |  | 44,158,000 |
Indefinite-lived Intangible Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cost |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 117,600,000 | 117,600,000 | 6,000,000 | 6,000,000 |  |  |  |  |  |  |  |  |  |
Accumulated amortization |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0 | 0 | 0 |  |  |  |  |  |  |  |  |  |
Accumulated impairment charge |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (67,190,000) | (56,100,000) | (6,000,000) | (680,000) |  |  |  |  |  |  |  |  |  |
Carrying value |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 50,410,000 | 61,500,000 | 0 | 5,320,000 |  |  |  |  |  |  |  |  |  |
Weighted average amortization period |  |  |  |  |  |  |  |  |  |  |  |  |  |  | Indefinite | Indefinite | N/A | Indefinite |  |  |  |  |  |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cost |  |  |  |  |  |  |  |  | 74,350,000 | 74,350,000 | 39,800,000 | 39,800,000 | 73,706,000 | 71,140,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accumulated amortization |  |  |  |  |  |  |  |  | (3,232,000) | (788,000) | (12,708,000) | (10,585,000) | (52,357,000) | (41,938,000) |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accumulated impairment charge |  |  |  |  |  |  |  |  | (23,232,000) | (800,000) | (16,645,000) | 0 | 0 | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Carrying value |  |  |  |  |  |  |  |  | 47,886,000 | 72,762,000 | 10,447,000 | 29,215,000 | 21,349,000 | 29,202,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted average amortization period |  |  |  |  |  |  |  |  | 20 years | 20 years | 11 years 4 months 24 days | 11 years 7 months 6 days | 3 years 7 months 6 days | 2 years 10 months 24 days |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total intangible assets [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cost | 311,456,000 |  | 308,890,000 |  |  | 311,456,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accumulated amortization | (68,297,000) |  | (53,311,000) |  |  | (68,297,000) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accumulated impairment charge | (113,067,000) |  | (57,580,000) |  |  | (113,067,000) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Carrying value | 130,092,000 |  | 197,999,000 |  |  | 130,092,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amortization Expense [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amortization expense during period | 3,600,000 |  |  | 2,900,000 |  | 15,000,000 | 6,900,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amortization expense, remainder of 2012 | 3,300,000 |  |  |  |  | 3,300,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amortization expense, 2013 | 13,100,000 |  |  |  |  | 13,100,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amortization expense, 2014 | 11,900,000 |  |  |  |  | 11,900,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amortization expense, 2015 | 5,300,000 |  |  |  |  | 5,300,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amortization expense, 2016 | 3,500,000 |  |  |  |  | 3,500,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amortization expense, thereafter | $ 42,600,000 |  |  |  |  | $ 42,600,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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