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Summary of Stock Option Activity (Parenthetical) (Detail)	9 Months Ended
	Sep. 30, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares, Granted	810,250	[1]
Outstanding amount of stock appreciation right units	2,848,877
Exercisable amount of stock appreciation right units	1,499,082
Stock appreciation rights (SARs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares, Granted	678,250
Maximum | Stock appreciation rights (SARs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Maximum percentage of stock appreciation right units	75.00%
[1] Included 678,250 SAR units which are convertible for a maximum number of shares of the Company's common stock equal to 75% of the SAR units subject to the grant

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Percentage of Stock appreciation rights units subject to grant.

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Share Based Compensation Arrangement by Share Based Payment Award Options and Stock Appreciation Rights Exercisable Number

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- Definition

Share Based Compensation Arrangement by Share Based Payment Award Options And Stock Appreciation Rights Outstanding Number

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- Definition

Net number of share options (or share units) granted during the period.

+ 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)(1)

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

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