Segment Information (Financial information for Company's segments) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011	Dec. 31, 2011
Segment Reporting Information [Line Items]
Revenues	$ 1,179,665	$ 537,042	$ 3,389,821	$ 1,401,932
Cost of services (exclusive of items shown separately below)	708,608	285,124	1,966,659	752,813
Depreciation, depletion, amortization and accretion	128,160	61,807	366,272	177,651
General and administrative expenses	163,458	93,813	496,998	272,243
Income from operations	179,439	96,298	559,892	199,225
Interest income (expense), net	(28,118)	(18,894)	(88,101)	(47,309)
Gains (Losses) on Extinguishment of Debt	(2,294)		(2,294)
Earnings (losses) from equity-method investments, net		8,198	(287)	13,724
Gain loss from Equity method investment			17,880
Income (loss) from continuing operations before income taxes	149,027	85,602	487,090	165,640
Identifiable Assets	7,789,618		7,789,618		4,048,145
Subsea and Well Enhancement [Member]
Segment Reporting Information [Line Items]
Revenues	984,783	373,586	2,807,432	961,039
Cost of services (exclusive of items shown separately below)	646,649	226,586	1,775,649	590,951
Depreciation, depletion, amortization and accretion	90,376	28,592	255,072	81,424
General and administrative expenses	131,078	64,950	396,123	183,040
Income from operations	116,680	53,458	380,588	105,624
Interest income (expense), net	697	1,248	2,106	3,483
Income (loss) from continuing operations before income taxes	117,377	54,706	382,694	109,107
Identifiable Assets	6,718,059		6,718,059		2,863,550
Drilling Products and Services [Member]
Segment Reporting Information [Line Items]
Revenues	194,882	163,456	582,389	440,893
Cost of services (exclusive of items shown separately below)	61,959	58,538	191,010	161,862
Depreciation, depletion, amortization and accretion	37,784	33,215	111,200	96,227
General and administrative expenses	32,380	28,863	100,875	89,203
Income from operations	62,759	42,840	179,304	93,601
Income (loss) from continuing operations before income taxes	62,759	42,840	179,304	93,601
Identifiable Assets	1,051,235		1,051,235		947,679
Marine [Member]
Segment Reporting Information [Line Items]
Identifiable Assets					164,444
Unallocated [Member]
Segment Reporting Information [Line Items]
Interest income (expense), net	(28,815)	(20,142)	(90,207)	(50,792)
Gains (Losses) on Extinguishment of Debt	(2,294)		(2,294)
Earnings (losses) from equity-method investments, net		8,198	(287)	13,724
Gain loss from Equity method investment			17,880
Income (loss) from continuing operations before income taxes	(31,109)	(11,944)	(74,908)	(37,068)
Identifiable Assets	$ 20,324		$ 20,324		$ 72,472