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Business Segments (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2014 | Sep. 30, 2013 | Sep. 30, 2014 | Sep. 30, 2013 | Dec. 31, 2013
Reportable segment information |  |  |  |  |  |  |  |  |  |
Revenues | $ 1,250,689 |  | $ 1,030,388 |  | $ 3,290,432 |  | $ 3,076,381 |  |  |
Income from construction operations: |  |  |  |  |  |  |  |  |  |
Income from construction operations | 70,354 |  | 58,094 |  | 177,294 |  | 133,647 |  |  |
Total Assets | 3,835,520 |  |  |  | 3,835,520 |  |  |  | 3,397,438 |
Elimination of intersegment revenues [Member] |  |  |  |  |  |  |  |  |  |
Reportable segment information |  |  |  |  |  |  |  |  |  |
Revenues | (21,789) |  | (26,054) |  | (72,333) |  | (122,765) |  |  |
Corporate [Member] |  |  |  |  |  |  |  |  |  |
Income from construction operations: |  |  |  |  |  |  |  |  |  |
Income from construction operations | (13,365) | [1] | (13,624) | [1] | (38,719) | [1] | (36,274) | [1] |  |
Total Assets | 602,490 | [2] |  |  | 602,490 | [2] |  |  | 615,108 | [2]
Operating segment [Member] |  |  |  |  |  |  |  |  |  |
Reportable segment information |  |  |  |  |  |  |  |  |  |
Revenues | 1,272,478 |  | 1,056,442 |  | 3,362,765 |  | 3,199,146 |  |  |
Income from construction operations: |  |  |  |  |  |  |  |  |  |
Income from construction operations | 83,719 |  | 71,718 |  | 216,013 |  | 169,921 |  |  |
Total Assets | 3,233,030 |  |  |  | 3,233,030 |  |  |  | 2,782,330 |
Civil [Member] |  |  |  |  |  |  |  |  |  |
Reportable segment information |  |  |  |  |  |  |  |  |  |
Revenues | 482,670 |  | 397,706 |  | 1,238,365 |  | 997,864 |  |  |
Civil [Member] | Elimination of intersegment revenues [Member] |  |  |  |  |  |  |  |  |  |
Reportable segment information |  |  |  |  |  |  |  |  |  |
Revenues | (13,472) |  | (4,270) |  | (32,292) |  | (66,073) |  |  |
Civil [Member] | Operating segment [Member] |  |  |  |  |  |  |  |  |  |
Reportable segment information |  |  |  |  |  |  |  |  |  |
Revenues | 496,142 |  | 401,976 |  | 1,270,657 |  | 1,063,937 |  |  |
Income from construction operations: |  |  |  |  |  |  |  |  |  |
Income from construction operations | 53,684 |  | 49,559 |  | 156,031 |  | 104,483 |  |  |
Total Assets | 1,764,712 |  |  |  | 1,764,712 |  |  |  | 1,384,937 |
Building [Member] |  |  |  |  |  |  |  |  |  |
Reportable segment information |  |  |  |  |  |  |  |  |  |
Revenues | 412,087 |  | 345,049 |  | 1,082,031 |  | 1,204,983 |  |  |
Building [Member] | Elimination of intersegment revenues [Member] |  |  |  |  |  |  |  |  |  |
Reportable segment information |  |  |  |  |  |  |  |  |  |
Revenues | (8,317) |  | (21,784) |  | (40,041) |  | (56,682) |  |  |
Building [Member] | Operating segment [Member] |  |  |  |  |  |  |  |  |  |
Reportable segment information |  |  |  |  |  |  |  |  |  |
Revenues | 420,404 |  | 366,833 |  | 1,122,072 |  | 1,261,665 |  |  |
Income from construction operations: |  |  |  |  |  |  |  |  |  |
Income from construction operations | 19,159 |  | 12,847 |  | 28,656 |  | 20,855 |  |  |
Total Assets | 665,267 |  |  |  | 665,267 |  |  |  | 663,314 |
Specialty Contractors [Member] |  |  |  |  |  |  |  |  |  |
Reportable segment information |  |  |  |  |  |  |  |  |  |
Revenues | 355,932 |  | 287,633 |  | 970,036 |  | 873,534 |  |  |
Specialty Contractors [Member] | Elimination of intersegment revenues [Member] |  |  |  |  |  |  |  |  |  |
Reportable segment information |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  | (10) |  |  |
Specialty Contractors [Member] | Operating segment [Member] |  |  |  |  |  |  |  |  |  |
Reportable segment information |  |  |  |  |  |  |  |  |  |
Revenues | 355,932 |  | 287,633 |  | 970,036 |  | 873,544 |  |  |
Income from construction operations: |  |  |  |  |  |  |  |  |  |
Income from construction operations | 10,876 |  | 9,312 |  | 31,326 |  | 44,583 |  |  |
Total Assets | $ 803,051 |  |  |  | $ 803,051 |  |  |  | $ 734,079 |
[1] | Consists primarily of corporate general and administrative expenses.
[2] | Consists principally of Cash and Cash Equivalents and corporate transportation equipment.

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