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Business Segments (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended
--- | ---
Mar. 31, 2013 | Mar. 31, 2012
Reportable segment information |  |
Total revenues | $ 1,058,335 | $ 929,476
Elimination of intersegment revenues | (65,407) | (16,942)
Revenues from external customers | 992,928 | 912,534
Income from construction operations | 36,079 | 16,963
Building |  |
Reportable segment information |  |
Total revenues | 425,114 | 343,039
Elimination of intersegment revenues | (11,475) | (2,245)
Revenues from external customers | 413,639 | 340,794
Income from construction operations | 4,237 | (8,897)
Civil |  |
Reportable segment information |  |
Total revenues | 283,975 | 250,589
Elimination of intersegment revenues | (51,288) | (1,216)
Revenues from external customers | 232,687 | 249,373
Income from construction operations | 21,554 | 16,842
Specialty Contractors |  |
Reportable segment information |  |
Total revenues | 301,877 | 267,736
Elimination of intersegment revenues | (10) | (298)
Revenues from external customers | 301,867 | 267,438
Income from construction operations | 19,286 | 19,748
Management Services |  |
Reportable segment information |  |
Total revenues | 47,369 | 68,112
Elimination of intersegment revenues | (2,634) | (13,183)
Revenues from external customers | 44,735 | 54,929
Income from construction operations | 2,806 | 1,886
Total Reportable Segments |  |
Reportable segment information |  |
Total revenues | 1,058,335 | 929,476
Elimination of intersegment revenues | (65,407) | (16,942)
Revenues from external customers | 992,928 | 912,534
Income from construction operations | 47,883 | 29,579
Corporate |  |
Reportable segment information |  |
Income from construction operations | $ 11,804 | $ (12,616)

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- Definition Revenue earned during the period arising from products sold or services provided under the terms of a contract, not elsewhere specified in the taxonomy. May include government contracts, construction contracts, and any other contract related to a particular project or product. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1) -URI http://asc.fasb.org/extlink&oid=6880815&loc=d3e20235-122688 + Details
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- Definition The net result for the period of deducting operating expenses from operating revenues. + References No definition available. + Details
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- Definition Amount of revenue from transactions with other operating segments of the same entity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 131 -Paragraph 27 -Subparagraph b -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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- Definition Amount of total revenue for the reportable segments, including revenue from external customers, transactions with other operating segments of the same entity, and (gross) interest revenue. All considered to be "operating revenue" for purposes of the taxonomy. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 22 -Subparagraph (a),(b),(c) -URI http://asc.fasb.org/extlink&oid=6534315&loc=d3e8736-108599 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 131 -Paragraph 27 -Subparagraph a, b, c -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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