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Reportable Operating Segments (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2012 | Sep. 30, 2012 | Jun. 30, 2012 | Mar. 31, 2012 | Dec. 31, 2011 | Sep. 30, 2011 | Jun. 30, 2011 | Mar. 31, 2011 | Dec. 31, 2012 item | Dec. 31, 2011 | Dec. 31, 2010
Reportable Operating Segments |  |  |  |  |  |  |  |  |  |  |
Number of operating segments |  |  |  |  |  |  |  |  | 3 |  |
Segment reporting information |  |  |  |  |  |  |  |  |  |  |
Revenue | $ 480,883 | $ 431,842 | $ 337,436 | $ 291,573 | $ 373,066 | $ 375,483 | $ 351,956 | $ 359,645 | $ 1,541,734 | $ 1,460,150 | $ 941,765
% of Segment Revenue |  |  |  |  |  |  |  |  | 100.00% | 100.00% | 100.00%
Gross Profit | 54,819 | 56,291 | 44,004 | 37,596 | 51,046 | 52,121 | 41,406 | 40,630 | 192,710 | 185,203 | 122,789
% of Segment Revenue |  |  |  |  |  |  |  |  | 12.50% | 12.70% | 13.00%
Goodwill | 116,941 |  |  |  | 94,179 |  |  |  | 116,941 | 94,179 |
East Construction Services |  |  |  |  |  |  |  |  |  |  |
Segment reporting information |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 662,248 | 528,745 | 480,533
% of Segment Revenue |  |  |  |  |  |  |  |  | 43.00% | 36.20% | 51.00%
Gross Profit |  |  |  |  |  |  |  |  | 63,811 | 57,118 | 48,770
% of Segment Revenue |  |  |  |  |  |  |  |  | 7.60% | 10.80% | 10.10%
Goodwill | 69,859 |  |  |  | 59,659 |  |  |  | 69,859 | 59,659 |
West Construction Services |  |  |  |  |  |  |  |  |  |  |
Segment reporting information |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 832,860 | 881,733 | 402,273
% of Segment Revenue |  |  |  |  |  |  |  |  | 54.00% | 60.40% | 42.70%
Gross Profit |  |  |  |  |  |  |  |  | 119,328 | 118,385 | 61,897
% of Segment Revenue |  |  |  |  |  |  |  |  | 14.30% | 13.40% | 15.40%
Goodwill | 44,641 |  |  |  | 32,079 |  |  |  | 44,641 | 32,079 |
Engineering |  |  |  |  |  |  |  |  |  |  |
Segment reporting information |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 46,626 | 49,672 | 58,959
% of Segment Revenue |  |  |  |  |  |  |  |  | 3.00% | 3.40% | 6.30%
Gross Profit |  |  |  |  |  |  |  |  | 9,571 | 9,700 | 12,122
% of Segment Revenue |  |  |  |  |  |  |  |  | 20.50% | 19.50% | 20.60%
Goodwill | $ 2,441 |  |  |  | $ 2,441 |  |  |  | $ 2,441 | $ 2,441 |

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