CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (Unaudited) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Income Statement [Abstract]
Revenues	$ 476,083	$ 647,250	$ 1,079,894	$ 1,454,738
Costs and Expenses:
Cost of operations	432,298	723,259	1,023,791	1,436,073
Selling, general and administrative expenses	56,877	52,617	112,274	104,843
Gain on asset disposals	(45,769)	(13)	(52,208)	(14,729)
Restructuring expenses	1,263	15,462	7,388	15,462
Total costs and expenses	444,669	791,325	1,091,245	1,541,649
Equity in Loss of Unconsolidated Affiliates	(3,322)	(5,461)	(2,199)	(9,592)
Operating Income (Loss)	28,092	(149,536)	(13,550)	(96,503)
Other Income (Expense):
Interest income (expense)-net	(38,745)	428	(38,684)	770
Gain on foreign currency-net	6,622	8,904	2,540	6,378
Other income (expense)-net	(312)	(31)	(577)	751
Total other income (expense)	(32,435)	9,301	(36,721)	7,899
Loss before provision for income taxes and noncontrolling interests	(4,343)	(140,235)	(50,271)	(88,604)
Provision for Income Taxes	4,788	5,902	8,277	33,215
Net Loss	(9,131)	(146,137)	(58,548)	(121,819)
Less: Net Income Attributable to Noncontrolling Interests	1,699	3,286	2,235	7,051
Net Loss Attributable to McDermott International, Inc.	$ (10,830)	$ (149,423)	$ (60,783)	$ (128,870)
Basic:
Loss from operations, less noncontrolling interests	$ (0.05)	$ (0.63)	$ (0.26)	$ (0.55)
Net loss attributable to McDermott International, Inc.	$ (0.05)	$ (0.63)	$ (0.26)	$ (0.55)
Diluted:
Loss from operations, less noncontrolling interests	$ (0.05)	$ (0.63)	$ (0.26)	$ (0.55)
Net loss attributable to McDermott International, Inc.	$ (0.05)	$ (0.63)	$ (0.26)	$ (0.55)
Shares used in the computation of earnings per share:
Basic	237,395,580	236,199,438	237,178,369	236,070,311
Diluted	237,395,580	236,199,438	237,178,369	236,070,311