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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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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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Number of shares that have been repurchased during the period and have not been retired and are not held in treasury. Some state laws may govern the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock.

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Equity - Additional Information (Detail) - USD ($)		12 Months Ended
Equity - Additional Information (Detail) - USD ($)	Jan. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Jan. 30, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares outstanding and trading		241,977,000	247,501,000
Additional conditionally authorized shares without additional shareholder approval		53,000,000
Current nominal value per share		$ 0.01
Shares outstanding repurchased percentage			15.00%
Repurchase of ordinary shares		6,200,000
Stock repurchase expiration date		Apr. 30, 2016
Repurchase of ordinary shares, value		$ 100,630,000	$ 154,145,000
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		99,063	50,796	57,095
Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation cost recognized		$ 100,000	$ 2,000,000	$ 3,000,000
Two Thousand Fifteen Omnibus Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Maximum aggregate number of ordinary shares that may be granted for any and all awards		7,300,000
Remaining number of shares available for grants		7,300,000
1992 Nonqualified Stock Option and Share Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Remaining number of shares available for grants		500,000
1992 Nonqualified Stock Option and Share Plan [Member] \| Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total number of shares issuable under stock option plan		2,000,000
1992 Nonqualified Stock Option and Share Plan [Member] \| Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total number of shares issuable under stock option plan		2,300,000
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		$ 30,000,000
Period for recognizing unrecognized compensation cost		1 year 8 months 12 days
Performance shares forfeited in period		333,419
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 7 months 6 days
Total unrecognized compensation cost		$ 11,000,000
Performance shares forfeited in period		601,962
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		517,223
Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation cost recognized		$ 39,000,000	46,000,000	44,000,000
Compensation cost recognized net of tax		31,000,000	37,000,000	36,000,000
Capitalized compensation costs		$ 1,000,000	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	$ 10,000,000
Subsequent Event [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Dividend to be paid, per share					$ 0.15
Dividends payable outstanding	$ 38,000,000
Dividend declaration, Date	Jan. 29, 2016
Dividend paid, Date	Feb. 16, 2016
Dividend record, Date	Feb. 08, 2016
Subsequent Event [Member] \| Performance Vested Shares for 2013-2015 Performance Period [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Performance shares forfeited in period	273,357