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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