Business Segment Information (Summary Of Intercompany Segment Revenues) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended																12 Months Ended
	Dec. 31, 2013		Sep. 30, 2013		Jun. 30, 2013		Mar. 31, 2013		Dec. 31, 2012		Sep. 30, 2012		Jun. 30, 2012		Mar. 31, 2012		Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Segment Reporting Information [Line Items]
Net revenues	$ 226,837	[1]	$ 220,117	[1]	$ 232,178	[1]	$ 197,429	[1]	$ 201,696	[2]	$ 217,110	[2]	$ 197,461	[2]	$ 229,842	[2]	$ 876,561	$ 846,109	$ 702,000
Intercompany Elimination [Member]
Segment Reporting Information [Line Items]
Net revenues																	68,607	133,775	111,695
Well Intervention [Member]
Segment Reporting Information [Line Items]
Net revenues																	452,452	378,546	340,952
Well Intervention [Member] | Intercompany Elimination [Member]
Segment Reporting Information [Line Items]
Net revenues																	22,448	36,781	16,175
Robotics [Member]
Segment Reporting Information [Line Items]
Net revenues																	333,246	328,726	245,360
Robotics [Member] | Intercompany Elimination [Member]
Segment Reporting Information [Line Items]
Net revenues																	41,169	46,465	45,251
Subsea Construction [Member]
Segment Reporting Information [Line Items]
Net revenues																	71,321	192,521	151,923
Subsea Construction [Member] | Intercompany Elimination [Member]
Segment Reporting Information [Line Items]
Net revenues																	317	4,472	4,212
Production Facilities [Member]
Segment Reporting Information [Line Items]
Net revenues																	88,149	80,091	75,460
Production Facilities [Member] | Intercompany Elimination [Member]
Segment Reporting Information [Line Items]
Net revenues																	$ 4,673	$ 46,057	$ 46,057

[1] Excludes revenues from discontinued operations of $48.8 million for the quarter ended March 31, 2013.

[2] Excludes revenues from discontinued operations of $178.1 million, $149.9 million, $119.1 million and $110.1 million for the quarters ended March 31, June 30, September 30 and December 31, 2012.