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Stock-Based Compensation (Detail) - (Table 5) (USD $)					12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009	Dec. 31, 2012 Exercise Price 5.45 to 12.15 [Member]	Dec. 31, 2012 Exercise Price 12.16 to 18.90 [Member]	Dec. 31, 2012 Exercise Price 18.91 to 25.60 [Member]	Dec. 31, 2012 Exercise Price 25.61 to 32.35 [Member]	Dec. 31, 2012 Exercise Price 32.36 to 39.05 [Member]	Dec. 31, 2012 Total [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number	2,269,000	2,703,000	2,703,000	2,423,000	851,000	171,000	602,000	237,000	408,000	2,269,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Remaining Contractual Term					2 years 11 months	3 years 11 months	4 years 2 months	5 years 2 months	5 years 8 months	4 years
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price	$ 20.57	$ 17.79	$ 14.08	$ 9.12	$ 8.31	$ 14.97	$ 23.87	$ 29.03	$ 38.70	$ 20.57
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number	1,111,000				565,000	58,000	228,000	49,000	211,000	1,111,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Exercise Price	$ 17.98				$ 8.27	$ 14.37	$ 23.46	$ 28.69	$ 36.60	$ 17.98

X

- Definition

The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

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- Definition

The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan.

+ References

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Weighted average remaining contractual term for vested portions of options outstanding and currently exercisable or convertible, 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 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.

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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.



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