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Goodwill and intangible assets (Schedule of Goodwill) (Details) (USD $)
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Goodwill [Roll Forward]    
Goodwill Balance at January 1, net $ 695,799,000 $ 600,827,000
Acquisition 100,257,000 85,092,000
Purchase accounting adjustment 97,000 1,379,000
Impact of non-U.S. local currency translation 6,165,000 8,501,000
Goodwill Balance at December 31, net 802,318,000 695,799,000
Accumulated impairment losses on goodwill 40,000,000 40,000,000
Drilling & Subsea [Member]
    
Goodwill [Roll Forward]    
Goodwill Balance at January 1, net 616,520,000 523,019,000
Acquisition 100,257,000 85,092,000
Purchase accounting adjustment 97,000 0
Impact of non-U.S. local currency translation 6,481,000 8,409,000
Goodwill Balance at December 31, net 723,355,000 616,520,000
Production & Infrastructure [Member]
    
Goodwill [Roll Forward]    
Goodwill Balance at January 1, net 79,279,000 77,808,000
Acquisition 0 0
Purchase accounting adjustment 0 1,379,000
Impact of non-U.S. local currency translation (316,000) 92,000
Goodwill Balance at December 31, net $ 78,963,000 $ 79,279,000