Business Segment Information (Summary Of Intercompany Segment Revenues) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Segment Reporting Information [Line Items]
Net revenues	$ (305,587)	$ (232,178)	$ (559,159)	$ (429,607)
Intercompany Elimination [Member]
Segment Reporting Information [Line Items]
Net revenues	19,384	17,352	36,900	38,370
Well Intervention [Member] | Intercompany Elimination [Member]
Segment Reporting Information [Line Items]
Net revenues	7,956	6,439	13,417	10,268
Robotics [Member] | Intercompany Elimination [Member]
Segment Reporting Information [Line Items]
Net revenues	11,428	10,913	23,483	23,112
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