Business Segment Information (Summary Of Financial Data By Segment) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended																12 Months Ended															1 Months Ended	12 Months Ended	1 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	Dec. 31, 2013 Well Intervention [Member]	Dec. 31, 2012 Well Intervention [Member]	Dec. 31, 2011 Well Intervention [Member]	Dec. 31, 2013 Robotics [Member]	Dec. 31, 2012 Robotics [Member]	Dec. 31, 2011 Robotics [Member]	Dec. 31, 2013 Subsea Construction [Member]		Dec. 31, 2012 Subsea Construction [Member]		Dec. 31, 2011 Subsea Construction [Member]		Jun. 30, 2013 Caesar [Member]	Dec. 31, 2012 Caesar [Member]	Jul. 31, 2013 Express [Member]	Dec. 31, 2012 Intrepid Vessel [Member]	Dec. 31, 2013 Production Facilities [Member]	Dec. 31, 2012 Production Facilities [Member]	Dec. 31, 2011 Production Facilities [Member]	Dec. 31, 2013 Corporate And Eliminations [Member]	Dec. 31, 2012 Corporate And Eliminations [Member]	Dec. 31, 2011 Corporate And Eliminations [Member]	Dec. 31, 2013 Corporate [Member]	Dec. 31, 2012 Corporate [Member]	Dec. 31, 2011 Corporate [Member]	Dec. 31, 2013 Intercompany Elimination [Member]	Dec. 31, 2012 Intercompany Elimination [Member]	Dec. 31, 2011 Intercompany Elimination [Member]	Dec. 31, 2012 Discontinued Operations [Member]	Dec. 31, 2011 Discontinued Operations [Member]
Segment Reporting Information [Line Items]
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	$ 452,452	$ 378,546	$ 340,952	$ 333,246	$ 328,726	$ 245,360	$ 71,321		$ 192,521		$ 151,923						$ 88,149	$ 80,091	$ 75,460							$ (68,607)	$ (133,775)	$ (111,695)
Income (loss) from operations																	179,034	(68,483)	63,040	131,840	85,482	80,030	44,132	55,678	36,518	33,685	[3]	(148,862)	[3]	(9,535)	[3]					49,778	40,082	38,404				(77,041)	(92,985)	(82,470)	(3,360)	(7,878)	93
Net interest expense and other																	38,411	65,949	73,682	(217)	2,152	(1,062)	(210)	(1,203)	1,847	480		(247)		(20)						380	365	442	37,978	64,882	72,475
Equity in earnings of investments																	2,965	8,434	22,215
Income (loss) before income taxes																	143,588	(125,998)	1,010	132,057	83,205	72,642	44,342	56,881	34,671	33,205		(148,615)		(9,515)						52,363	48,276	58,064	(118,379)	(165,745)	(154,852)
Income tax provision (benefit)																	31,612	(59,158)	(36,806)	26,718	15,400	21,154	15,530	20,222	10,978	11,655		(51,329)		(2,897)						17,233	15,784	19,233	(39,524)	(59,235)	(85,274)
Total assets	2,544,280								3,386,580								2,544,280	3,386,580	3,582,347	1,245,229	936,926	682,449	282,373	258,117	207,205	38,054		303,479		548,043						495,829	504,828	536,026				482,795	483,003	584,304				900,227	1,024,320
Capital expenditures																	324,426	323,039	100,154	283,132	274,451	13,923	39,655	44,500	27,045											1,252	823	30,896				387	3,265	28,290
Depreciation and amortization																	98,535	97,201	91,188	44,619	37,736	35,544	22,263	19,933	16,426	8,651		19,773		21,321						17,193	16,828	14,935	5,809	2,931	2,962
Gain on sale or acquisition of assets, net																	14,727	(13,476)	(6)													(1,100)		15,600
Impairment of Long-Lived Assets Held-for-use									$ 158,000		$ 4,600		$ 14,600					$ 177,135	$ 6,564														$ 157,800		$ 14,600

[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.

[3] Amount in 2013 includes the $1.1 million loss on the sale of the Caesar in June 2013 and the $15.6 million gain on the sale of the Express in July 2013. Amount in 2012 includes impairment charges of $157.8 million for the Caesar and $14.6 million for the Intrepid (Note 2).