Business Segment Information (Intercompany Segment Gross Profit (Loss)) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Segment Reporting Information [Line Items]
Gross profit	$ (75,846)	$ (52,567)
Intercompany Elimination [Member]
Segment Reporting Information [Line Items]
Gross profit	1,198	1,720
Well Intervention [Member] | Intercompany Elimination [Member]
Segment Reporting Information [Line Items]
Gross profit	(62)	(19)
Robotics [Member] | Intercompany Elimination [Member]
Segment Reporting Information [Line Items]
Gross profit	1,304	1,625
Subsea Construction [Member] | Intercompany Elimination [Member]
Segment Reporting Information [Line Items]
Gross profit		158
Production Facilities [Member] | Intercompany Elimination [Member]
Segment Reporting Information [Line Items]
Gross profit	$ (44)	$ (44)