Computation of Earnings Per Ordinary Share and Ordinary Share Equivalents (Detail) - Computation of basic and diluted earnings per share (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
Mar. 31, 2012	Mar. 31, 2011
Net income (loss) attributable to ordinary shareholders (in Dollars)	$ 176,628	$ (227,284)
Weighted average ordinary shares outstanding	315,120	311,478
Basic earnings per ordinary share & ordinary share equivalents outstanding (in Dollars per share)	$ 0.56	$ (0.73)
Diluted earnings per ordinary share & ordinary share equivalents outstanding:
Weighted average ordinary shares outstanding - basic	315,120	311,478
Impact of share based compensation and certain conversion features	2,519	0
Weighted average ordinary shares outstanding - diluted	317,639	311,478
Diluted earnings per ordinary share & ordinary share equivalents outstanding (in Dollars per share)	$ 0.56	$ (0.73)
Dividends per ordinary share (in Dollars per share)	$ 0.11	$ 0.11

Computation of Earnings Per Ordinary Share and Ordinary Share Equivalents (Detail) - Computation of basic and diluted earnings per share (USD $)
In Thousands, except Per Share data, unless otherwise specified

3 Months Ended

Mar. 31, 2012

Mar. 31, 2011

Net income (loss) attributable to ordinary shareholders (in Dollars)

$ 176,628

$ (227,284)

Weighted average ordinary shares outstanding

315,120

311,478

Basic earnings per ordinary share & ordinary share equivalents outstanding (in Dollars per share)

$ 0.56

$ (0.73)

Diluted earnings per ordinary share & ordinary share equivalents outstanding:

Weighted average ordinary shares outstanding - basic

315,120

311,478

Impact of share based compensation and certain conversion features

2,519

Weighted average ordinary shares outstanding - diluted

317,639

311,478

Diluted earnings per ordinary share & ordinary share equivalents outstanding (in Dollars per share)

$ 0.56

$ (0.73)

Dividends per ordinary share (in Dollars per share)

$ 0.11

- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 04

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-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 128

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Reference 3: http://www.xbrl.org/2003/role/presentationRef

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-Publisher FASB

-Name Emerging Issues Task Force (EITF)

-Number 07-4

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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 8: http://www.xbrl.org/2003/role/presentationRef

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-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 04

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Reference 10: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

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Reference 11: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 20

-Article 5

+ Details

- 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.

+ References+ Details

- Definition

The average number of shares or units issued and outstanding that are used in calculating diluted EPS or earnings per unit (EPU), determined based on the timing of issuance of shares or units in the period.

+ References+ Details

- Definition

Number of [basic] shares or units, after adjustment for contingently issuable shares or units and other shares or units not deemed outstanding, determined by relating the portion of time within a reporting period that common shares or units have been outstanding to the total time in that period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 128

-Paragraph 40

-Subparagraph a

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

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-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

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Reference 5: http://www.xbrl.org/2003/role/presentationRef

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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 6: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 7: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Weighted-Average Number of Common Shares Outstanding

-URI http://asc.fasb.org/extlink&oid=6528421

+ Details