CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (Unaudited) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Income Statement [Abstract]
Revenues	$ 414,595	$ 686,856	$ 1,494,489	$ 2,141,594
Costs and Expenses:
Cost of operations	370,271	686,415	1,394,062	2,122,488
Selling, general and administrative expenses	55,113	46,443	167,387	151,286
Gains on asset disposals	(4,818)	(763)	(57,026)	(15,492)
Restructuring expenses	4,724	4,040	12,112	19,502
Total costs and expenses	425,290	736,135	1,516,535	2,277,784
Equity in Loss of Unconsolidated Affiliates	(3,448)	(3,375)	(5,647)	(12,967)
Operating Loss	(14,143)	(52,654)	(27,693)	(149,157)
Other Income (Expense):
Interest income (expense) - net	(11,847)	363	(50,531)	1,133
Gain (loss) on foreign currency-net	(2,397)	4,460	143	10,838
Other income (expense) - net	473	1,062	(104)	1,813
Total other income (expense)	(13,771)	5,885	(50,492)	13,784
Loss before Provision for Income Taxes and Noncontrolling Interests	(27,914)	(46,769)	(78,185)	(135,373)
Provision for Income Taxes	1,464	12,278	9,741	45,493
Net Loss	(29,378)	(59,047)	(87,926)	(180,866)
Less: net income attributable to noncontrolling interest	4,306	5,023	6,541	12,074
Net Loss Attributable to McDermott International, Inc.	$ (33,684)	$ (64,070)	$ (94,467)	$ (192,940)
Basic:
Net loss attributable to McDermott International, Inc.	$ (0.14)	$ (0.27)	$ (0.40)	$ (0.82)
Diluted:
Loss from operations, less noncontrolling interests	$ (0.14)	$ (0.27)	$ (0.40)	$ (0.82)
Shares used in the computation of earnings per share:
Basic:	237,429,394	236,257,920	237,262,044	236,132,847
Diluted:	237,429,394	236,257,920	237,262,044	236,132,847