Business Segment Information (Summary Of Intercompany Segment Revenues) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Segment Reporting Information [Line Items]
Net revenues	$ (253,572)	$ (197,429)
Intercompany Elimination [Member]
Segment Reporting Information [Line Items]
Net revenues	17,516	21,018
Well Intervention [Member] | Intercompany Elimination [Member]
Segment Reporting Information [Line Items]
Net revenues	5,461	3,829
Robotics [Member] | Intercompany Elimination [Member]
Segment Reporting Information [Line Items]
Net revenues	12,055	12,199
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