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Segment Information (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
Segment Information                      
Number of reporting segments                 2    
Internal financial reports                      
Contract revenues $ 247,763 $ 250,558 $ 260,410 $ 240,228 $ 234,263 $ 210,489 $ 185,310 $ 150,294 $ 998,959 $ 780,356 $ 597,077
Income from operations                 55,762 29,629 26,505
T&D
                      
Internal financial reports                      
Contract revenues                 828,711 622,000 447,458
Income from operations                 80,460 52,053 36,613
C&I
                      
Internal financial reports                      
Contract revenues                 170,248 158,356 149,619
Income from operations                 7,647 5,833 7,091
General Corporate
                      
Internal financial reports                      
Income from operations                 $ (32,345) $ (28,257) $ (17,199)