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Stock-Based Compensation (Detail) - (Table 5) (USD $)					12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2013 Exercise Price 3.65 to 8.72 [Member]	Dec. 31, 2013 Exercise Price 9.50 to 14.99 [Member]	Dec. 31, 2013 Exercise Price 15.29 to 20.86 [Member]	Dec. 31, 2013 Exercise Price 21.17 to 26.95 [Member]	Dec. 31, 2013 Exercise Price 27.03 to 38.96 [Member]	Dec. 31, 2013 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	3,373,000	3,403,500	4,054,500	4,054,500	1,073,000	203,000	924,000	448,000	732,000	3,380,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Remaining Contractual Term					1 year 10 months	3 years 2 months	3 years 5 months	4 years 10 months	5 years 8 months	3 years 7 months
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price	$ 17.01	$ 13.71	$ 11.86	$ 9.39	$ 5.67	$ 13.43	$ 17.19	$ 24.55	$ 29.77	$ 17.01
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number	2,163,000				1,073,000	80,500	552,000	407,500	50,000	2,163,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Exercise Price	$ 12.88				$ 5.67	$ 13.26	$ 16.75	$ 24.62	$ 28.75	$ 12.88

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

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (c)(1)(iii)

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

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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

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

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-Section 50

-Paragraph 2

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

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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.

+ References

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

-Publisher FASB

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-Topic 718

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Number of options outstanding, including both vested and non-vested options.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

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-Paragraph 2

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



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

+ References

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-Publisher FASB

-Name Accounting Standards Codification

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