CONSOLIDATED STATEMENTS OF OPERATIONS (Unaudited) - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
		Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Income Statement [Abstract]
Revenues	[1]	$ 706,627	$ 1,046,537	$ 1,435,659	$ 1,597,000
Costs and Expenses:
Cost of operations		595,442	925,522	1,211,475	1,400,981
Selling, general and administrative expenses		52,075	47,793	90,403	99,469
Impairment loss			6,808	32,311	6,808
Loss (gain) on asset disposals		(362)	1,910	(362)	1,543
Restructuring expenses		2,484	15,391	8,851	25,780
Total costs and expenses		649,639	997,424	1,342,678	1,534,581
Operating income	[2]	56,988	49,113	92,981	62,419
Other income (expense):
Interest expense, net		(12,655)	(12,985)	(23,893)	(25,164)
Gain (loss) on foreign currency, net		(1,974)	1,943	(5,157)	475
Other expense, net		(877)	(359)	(1,085)	(456)
Total other expense		(15,506)	(11,401)	(30,135)	(25,145)
Income before provision for income taxes		41,482	37,712	62,846	37,274
Provision for income taxes		19,804	16,541	39,134	21,410
Income before income (loss) from investments in unconsolidated affiliates		21,678	21,171	23,712	15,864
Income (loss) from investments in unconsolidated affiliates		127	(7,481)	(4,351)	(14,222)
Net income		21,805	13,690	19,361	1,642
Less: Net income attributable to noncontrolling interest		1,148	2,164	876	4,623
Net income (loss) attributable to McDermott International, Inc.		$ 20,657	$ 11,526	$ 18,485	$ (2,981)
Net income (loss) attributable to McDermott International, Inc.
Basic:		$ 0.09	$ 0.05	$ 0.08	$ (0.01)
Diluted:		$ 0.07	$ 0.04	$ 0.07	$ (0.01)
Shares used in the computation of income (loss) per share:
Basic:		240,338,540	238,332,012	239,739,204	237,918,366
Diluted:		284,909,414	289,689,981	283,132,238	237,918,366

[1] Intersegment transactions included in revenues were not significant for either of the periods presented.

[2] The AEA segment’s operating results for the six months ended June 30, 2016 include an impairment charge of $32 million related to the Agile vessel. The ASA segment’s operating results in the six months ended June 30, 2015 included a $4 million impairment charge for the DB 101 and $3 million of loss on disposal of this asset.