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Shareholders' Equity - Summary of Stock Option Activity (Detail) (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Outstanding shares, beginning balance	26,453,152	35,296,895	37,943,832
Options forfeited, shares	(9,762,680)	(8,843,743)	(2,646,937)
Outstanding shares, ending balance	16,690,472	26,453,152	35,296,895
Stock option plans, Lower price range, Beginning Outstanding options	$ 16.73	$ 16.73	$ 16.73
Stock option plans, Upper price range, Beginning Outstanding options	$ 33.70	$ 39.00	$ 39.00
Options forfeited, Lower Range, Price Per Share	$ 17.08	$ 17.08	$ 17.08
Options forfeited, Upper Range, Price Per Share	$ 33.70	$ 39.00	$ 39.00
Stock option plans, Lower price range, Ending Outstanding options	$ 16.73	$ 16.73	$ 16.73
Stock option plans, Upper price range, Ending Outstanding options	$ 27.21	$ 33.70	$ 39.00
Outstanding, Weighted Average Price Per Share, beginning	$ 24.51	$ 27.17	$ 27.33
Options forfeited, Weighted Average Price Per Share	$ 30.50	$ 35.11	$ 29.55
Outstanding, Weighted Average Price Per Share, ending	$ 21.00	$ 24.51	$ 27.17

X

- Definition

Notional Amount Of Foreign Currency Cash Flow Hedge Derivatives Share Based Compensation Shares Authorized Under Stock Option Plans Exercise Price Range Lower Range Limit.

+ References

No definition available.

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Notional Amount Of Foreign Currency Cash Flow Hedge Derivatives Share Based Compensation Shares Authorized Under Stock Option Plans Exercise Price Range Upper Range Limit.

+ References

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- Definition

Stock option plans, options forfeited, lower range, price per share.

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Stock option plans, options forfeited, upper range, price per share.

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- Definition

The number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (c)(1)(iv)(3)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901



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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 123R

-Paragraph A240

-Subparagraph b(1)(f)

-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.

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- Definition

The number of shares reserved for issuance under stock option agreements awarded under the plan that validly exist and are outstanding as of the balance sheet date, including vested options.

+ References

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 123R

-Paragraph A240

-Subparagraph b(1)(b)

-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

-Topic 718

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-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901



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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

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-Paragraph 2

-Subparagraph (c)(1)(i)-(ii)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901



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-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 123R

-Paragraph A240

-Subparagraph b(1)(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.

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- Definition

Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (c)(1)(i)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901



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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 123R

-Paragraph A240

-Subparagraph b(1)(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.

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- Definition

Weighted average price at which grantees could have acquired the underlying shares with respect to stock options that were terminated.

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