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Business Segments (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2012 | Jun. 30, 2011 | Jun. 30, 2012 | Jun. 30, 2011 | Dec. 31, 2011
Segmented Revenues [Abstract] |  |  |  |  |  |  |  |
Total Revenues | $ 999,671 |  | $ 842,948 | $ 1,929,147 |  | $ 1,474,799 |  |
Elimination of intersegment revenues | (14,325) |  | (23,090) | (31,267) |  | (39,652) |  |
Revenue from external customers | 985,346 |  | 819,858 | 1,897,880 |  | 1,435,147 |  |
Segmented Income from Construction Operations [Abstract] |  |  |  |  |  |  |  |
Before Impairment Charge | 22,400 |  |  | 39,363 |  |  |  |
Impairment Charge | (376,574) |  | 0 | (376,574) |  | 0 |  |
Income from Construction Operations | (354,174) |  | 37,035 | (337,211) |  | 55,548 |  |
Segment reporting information assets [Abstract] |  |  |  |  |  |  |  |
Assets | 3,176,572 |  |  | 3,176,572 |  |  | 3,613,127 |
Building [Member] |  |  |  |  |  |  |  |
Segmented Revenues [Abstract] |  |  |  |  |  |  |  |
Total Revenues | 331,924 |  | 529,004 | 674,963 |  | 894,487 |  |
Elimination of intersegment revenues | (1,664) |  | (3,842) | (3,909) |  | (8,705) |  |
Revenue from external customers | 330,260 |  | 525,162 | 671,054 |  | 885,782 |  |
Segmented Income from Construction Operations [Abstract] |  |  |  |  |  |  |  |
Before Impairment Charge | (14,487) |  |  | (23,384) |  |  |  |
Impairment Charge | (282,608) |  |  | (282,608) |  |  |  |
Income from Construction Operations | (297,095) |  | 23,575 | (305,992) |  | 34,827 |  |
Segment reporting information assets [Abstract] |  |  |  |  |  |  |  |
Assets | 696,963 |  |  | 696,963 |  |  | 1,125,632 |
Civil [Member] |  |  |  |  |  |  |  |
Segmented Revenues [Abstract] |  |  |  |  |  |  |  |
Total Revenues | 327,072 |  | 148,304 | 577,661 |  | 276,952 |  |
Elimination of intersegment revenues | (3,376) |  | (1,840) | (4,592) |  | (5,443) |  |
Revenue from external customers | 323,696 |  | 146,464 | 573,069 |  | 271,509 |  |
Segmented Income from Construction Operations [Abstract] |  |  |  |  |  |  |  |
Before Impairment Charge | 25,762 |  |  | 42,604 |  |  |  |
Impairment Charge | (65,503) |  |  | (65,503) |  |  |  |
Income from Construction Operations | (39,741) |  | 14,875 | (22,899) |  | 27,927 |  |
Segment reporting information assets [Abstract] |  |  |  |  |  |  |  |
Assets | 1,051,891 |  |  | 1,051,891 |  |  | 1,102,471 |
Specialty Contractors [Member] |  |  |  |  |  |  |  |
Segmented Revenues [Abstract] |  |  |  |  |  |  |  |
Total Revenues | 275,902 |  | 87,200 | 543,638 |  | 178,885 |  |
Elimination of intersegment revenues | 0 |  | 0 | (298) |  | 0 |  |
Revenue from external customers | 275,902 |  | 87,200 | 543,340 |  | 178,885 |  |
Segmented Income from Construction Operations [Abstract] |  |  |  |  |  |  |  |
Before Impairment Charge | 19,868 |  |  | 39,616 |  |  |  |
Impairment Charge | (11,489) |  |  | (11,489) |  |  |  |
Income from Construction Operations | 8,379 |  | 1,754 | 28,127 |  | 2,682 |  |
Segment reporting information assets [Abstract] |  |  |  |  |  |  |  |
Assets | 662,818 |  |  | 662,818 |  |  | 597,986 |
Management Services [Member] |  |  |  |  |  |  |  |
Segmented Revenues [Abstract] |  |  |  |  |  |  |  |
Total Revenues | 64,773 |  | 78,440 | 132,885 |  | 124,475 |  |
Elimination of intersegment revenues | (9,285) |  | (17,408) | (22,468) |  | (25,504) |  |
Revenue from external customers | 55,488 |  | 61,032 | 110,417 |  | 98,971 |  |
Segmented Income from Construction Operations [Abstract] |  |  |  |  |  |  |  |
Before Impairment Charge | 1,852 |  |  | 3,738 |  |  |  |
Impairment Charge | (16,974) |  |  | (16,974) |  |  |  |
Income from Construction Operations | (15,122) |  | 6,519 | (13,236) |  | 9,160 |  |
Segment reporting information assets [Abstract] |  |  |  |  |  |  |  |
Assets | 178,477 |  |  | 178,477 |  |  | 182,583 |
Sub Total [Member] |  |  |  |  |  |  |  |
Segmented Revenues [Abstract] |  |  |  |  |  |  |  |
Total Revenues | 999,671 |  | 842,948 | 1,929,147 |  | 1,474,799 |  |
Elimination of intersegment revenues | (14,325) |  | (23,090) | (31,267) |  | (39,652) |  |
Revenue from external customers | 985,346 |  | 819,858 | 1,897,880 |  | 1,435,147 |  |
Segmented Income from Construction Operations [Abstract] |  |  |  |  |  |  |  |
Before Impairment Charge | 32,995 |  |  | 62,574 |  |  |  |
Impairment Charge | (376,574) |  |  | (376,574) |  |  |  |
Income from Construction Operations | (343,579) |  | 46,723 | (314,000) |  | 74,596 |  |
Segment reporting information assets [Abstract] |  |  |  |  |  |  |  |
Assets | 2,590,149 |  |  | 2,590,149 |  |  | 3,008,672 |
Corporate [Member] |  |  |  |  |  |  |  |
Segmented Revenues [Abstract] |  |  |  |  |  |  |  |
Total Revenues | 0 |  | 0 | 0 |  | 0 |  |
Elimination of intersegment revenues | 0 |  | 0 | 0 |  | 0 |  |
Revenue from external customers | 0 |  | 0 | 0 |  | 0 |  |
Segmented Income from Construction Operations [Abstract] |  |  |  |  |  |  |  |
Before Impairment Charge | (10,595) |  |  | (23,211) |  |  |  |
Impairment Charge | 0 |  |  | 0 |  |  |  |
Income from Construction Operations | (10,595) |  | (9,688) | (23,211) |  | (19,048) |  |
Segment reporting information assets [Abstract] |  |  |  |  |  |  |  |
Assets | $ 586,423 | [1] |  | $ 586,423 | [1] |  | $ 604,455 | [1]
[1] | Consists principally of Cash and Cash Equivalents, corporate transportation equipment, and other investments available for general corporate purposes

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