Business Segment Information (Summary Of Intercompany Segment Revenues) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Segment Reporting Information [Line Items]
Net revenues	$ (340,837)	$ (220,117)	$ (899,996)	$ (649,724)
Intercompany Elimination [Member]
Segment Reporting Information [Line Items]
Net revenues	20,193	12,977	57,093	51,347
Well Intervention [Member] | Intercompany Elimination [Member]
Segment Reporting Information [Line Items]
Net revenues	8,635	4,784	22,052	15,052
Robotics [Member] | Intercompany Elimination [Member]
Segment Reporting Information [Line Items]
Net revenues	11,558	8,193	35,041	31,305
Subsea Construction [Member] | Intercompany Elimination [Member]
Segment Reporting Information [Line Items]
Net revenues				317
Production Facilities [Member] | Intercompany Elimination [Member]
Segment Reporting Information [Line Items]
Net revenues				$ 4,673