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Goodwill (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 12 Months Ended 3 Months Ended 12 Months Ended 12 Months Ended 12 Months Ended
Sep. 30, 2011
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Dec. 31, 2011
North America Contract Operations [Member]
Dec. 31, 2010
North America Contract Operations [Member]
Dec. 31, 2009
North America Contract Operations [Member]
Jun. 30, 2009
International Contract Operations [Member]
Dec. 31, 2011
International Contract Operations [Member]
Dec. 31, 2010
International Contract Operations [Member]
Dec. 31, 2009
International Contract Operations [Member]
Dec. 31, 2011
Aftermarket Services [Member]
Dec. 31, 2010
Aftermarket Services [Member]
Dec. 31, 2009
Aftermarket Services [Member]
Dec. 31, 2011
Fabrication [Member]
Dec. 31, 2010
Fabrication [Member]
Dec. 31, 2009
Fabrication [Member]
Change in the net carrying amount of goodwill                                  
Goodwill   $ 1,583,525 $ 1,583,398 $ 1,581,882 $ 1,148,371 $ 1,148,371 $ 1,148,371   $ 150,778 $ 150,778 $ 150,778 $ 63,299 $ 63,095 $ 62,471 $ 221,077 $ 221,154 $ 220,262
Accumulated impairment losses   (1,583,525) (1,386,718) (1,386,718) (1,148,371) (1,148,371) (1,148,371)   (150,778) (150,778) (150,778) (63,299) 0 0 (221,077) (87,569) (87,569)
Ending Balance   0 196,680 195,164 0 0 0   0 0 0 0 63,095 62,471 0 133,585 132,693
Goodwill acquired during year   665     0       0     447     218    
Impairment losses (196,100) (196,807)   (150,778) 0     (150,800) 0     (63,299)     (133,508)    
Impact of foreign currency Translation   $ (538) $ 1,516   $ 0 $ 0     $ 0 $ 0   $ (243) $ 624   $ (295) $ 892