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Goodwill and Intangible Assets (Details) (USD $) In Thousands, unless otherwise specified | 9 Months Ended |
--- | --- | ---
Sep. 30, 2013 | Dec. 31, 2012
Goodwill |  |
Gross goodwill |  | $ 1,058,631
Accumulated impairment |  | (487,985)
Balance at beginning of period | 570,646 |
Goodwill recorded in connection with an acquisition | 1,286 |
Balance at end of period | 571,932 |
Building |  |
Goodwill |  |
Gross goodwill |  | 420,267
Accumulated impairment |  | (409,765)
Balance at beginning of period |  | 10,502
Balance at end of period | 10,502 | 10,502
Building | Minimum |  |
Goodwill |  |
Percentage of fair value in excess of carrying amount (in hundredths) |  | 10.00%
Civil |  |
Goodwill |  |
Gross goodwill |  | 429,893
Accumulated impairment |  | (55,740)
Balance at beginning of period |  | 374,153
Balance at end of period | 374,153 | 374,153
Civil | Minimum |  |
Goodwill |  |
Percentage of fair value in excess of carrying amount (in hundredths) |  | 10.00%
Specialty Contractors |  |
Goodwill |  |
Gross goodwill |  | 141,833
Balance at beginning of period | 141,833 |
Goodwill recorded in connection with an acquisition | 1,286 |
Balance at end of period | 143,119 |
Specialty Contractors | Minimum |  |
Goodwill |  |
Percentage of fair value in excess of carrying amount (in hundredths) |  | 10.00%
Management Services |  |
Goodwill |  |
Gross goodwill |  | 66,638
Accumulated impairment |  | (22,480)
Balance at beginning of period |  | 44,158
Balance at end of period | $ 44,158 | $ 44,158
Percentage of fair value in excess of carrying amount (in hundredths) |  | 4.50%

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- Definition Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=14024403&loc=d3e13816-109267 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13770-109266 + Details
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- Definition Amount of increase in asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized resulting from a business combination. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=14024403&loc=d3e13816-109267 + Details
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- Definition Amount before accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a,h) -URI http://asc.fasb.org/extlink&oid=14024403&loc=d3e13816-109267 + Details
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- Definition Percentage of fair value of reporting unit in excess of carrying amount. + References No definition available. + Details
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