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Number of shares remaining to be acquired under share repurchase program.

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Percentage of outstanding shares repurchased during period.

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Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

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The amount of expense, net of income tax, recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

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Number of shares of common stock outstanding. Common stock represent the ownership interest in a corporation.

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Number of shares issued pursuant to the terms of a deferred compensation arrangement.

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Represents the compensation cost capitalized during the period arising from equity-based compensation arrangements (for example, shares of stock, units, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

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Unrecognized cost of unvested share-based compensation awards.

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Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Unrecognized cost of unvested share-based awards, other than options, awarded to employees as compensation.

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Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period.

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Fair value of share-based awards for which the grantee gained the right by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash.

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Increase (decrease) in the number of shares under non-option equity instrument agreements.

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Number of additional shares authorized for issuance under an established share-based compensation plan.

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The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested).

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The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable.

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Gross number of share options (or share units) granted during the period.

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The increase or decrease in number of shares reserved for issuance under stock option agreements awarded under the plan that validly exist and are outstanding, including vested options.

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Fair value of options vested. Excludes equity instruments other than options, for example, but not limited to, share units, stock appreciation rights, restricted stock.

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Per share or per unit amount of equity securities issued.

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The number of shares authorized to be repurchased by an entity's Board of Directors under a stock repurchase plan.

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Number of shares that have been repurchased and retired during the period.

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Equity impact of the value of stock that has been repurchased and retired during the period. The excess of the purchase price over par value can be charged against retained earnings (once the excess is fully allocated to additional paid in capital).

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Equity - Additional Information (Detail) - USD ($)		1 Months Ended		3 Months Ended	12 Months Ended
Equity - Additional Information (Detail) - USD ($)	Aug. 01, 2014	Feb. 28, 2017	Dec. 31, 2014	Dec. 31, 2016	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Oct. 25, 2007	Oct. 24, 2007
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares outstanding and trading				243,239,000	243,239,000	241,977,000
Additional conditionally authorized shares without additional shareholder approval				53,000,000	53,000,000
Current nominal value per share				$ 0.01	$ 0.01
Cash dividend eliminated by Board (usd per share)				$ 0.02
Number of shares authorized to be repurchased			37,000,000				37,000,000
Shares outstanding repurchased percentage			15.00%
Repurchase of ordinary shares that were cancelled						6,200,000
Repurchase of ordinary shares that were cancelled, value						$ 101,000,000
Additional stock options issued	339,223
Incremental fair value awarded as a result of the issuance of awards					$ 0
Stock option exercisable term					10 years
Weighted-average vesting period (years)					3 years
Stock options granted					0	0	0
Incremental fair value awarded as a result of the issuance of awards					$ 0
Unrestricted shares awarded					227,937	99,063	50,796
Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation cost recognized					$ 0	$ 100,000	$ 2,000,000
Two Thousand Fifteen Omnibus Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total number of shares issuable under stock option plan				16,800,000	16,800,000
Additional shares authorized under plan					9,500,000.0
Remaining number of shares available for grants				11,300,000	11,300,000
1992 Nonqualified Stock Option and Share Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total number of shares issuable under stock option plan								2,300,000	2,000,000
Remaining number of shares available for grants				300,000	300,000
TVRSUs Outstanding [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Issuance of additional RSUs					326,853
PVRSUs Outstanding [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Issuance of additional RSUs					329,937
TVRSU's Outstanding [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted-average vesting period (years)					3 years
Incremental fair value awarded as a result of the issuance of awards					$ 30,000,000
Total unrecognized compensation cost				$ 24,000,000	$ 24,000,000
Period for recognizing unrecognized compensation cost					1 year 8 months 12 days
Performance shares forfeited in period					1,056,450
PVRSU's Outstanding [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted-average vesting period (years)					3 years
Period for recognizing unrecognized compensation cost					1 year 8 months 12 days
Total unrecognized compensation cost				$ 9,000,000	$ 9,000,000
Performance shares forfeited in period					759,916
Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation cost recognized					$ 2,000,000	2,000,000	2,000,000
Performance Vested Shares for 2012-2014 Performance Period [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Performance shares forfeited in period					273,357
Performance Vested Shares for 2013-2015 Performance Period [Member] \| Subsequent Event [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Performance shares forfeited in period		387,392
Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation cost recognized					$ 35,000,000	39,000,000	46,000,000
Compensation cost recognized net of tax					31,000,000	31,000,000	37,000,000
Capitalized compensation costs					$ 200,000	$ 1,000,000	1,000,000
Restricted Stock \| Paragon Offshore [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation cost recognized							$ 7,000,000