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Earnings Per Share - Computation of Basic and Diluted Earnings Per Share (Detail) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Earnings Per Share [Abstract]
Net loss attributable to McDermott International, Inc.	$ (14,507)us-gaap_NetIncomeLoss	$ (46,520)us-gaap_NetIncomeLoss
Weighted average common shares (basic)	237,504,719	236,961,158
Effect of dilutive securities:
Adjusted weighted average common shares and assumed exercises of stock options and vesting of stock awards (diluted)	237,504,719	236,961,158
Basic loss per share
Net loss attributable to McDermott International, Inc.	$ (0.06)us-gaap_EarningsPerShareBasic	$ (0.20)us-gaap_EarningsPerShareBasic
Diluted loss per share:
Net loss attributable to McDermott International, Inc.	$ (0.06)us-gaap_EarningsPerShareDiluted	$ (0.20)us-gaap_EarningsPerShareDiluted

The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

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- Definition

The amount of net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.

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- Definition

The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

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