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Number of Shares Purchased and Maximum Value of Shares That yet be Purchased Under Plan (Detail) (USD $) In Thousands, except Share data, unless otherwise specified	1 Months Ended
	Dec. 31, 2012
Stock Repurchase Program [Line Items]
Total Number of Shares Purchased	347,592
Average Price Paid Per Share	$ 32.25
Total Number of Shares Purchased as Part of Publicly Announced Plan	347,592
Maximum Value of Shares that May Yet Be Purchased Under the Plan	$ 13,791

X

- Definition

Stock Repurchase Program Average Price

+ References

No definition available.

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- Definition

Stock Repurchase Program Number Of Shares Repurchased During Period

+ References

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X

- Definition

The remaining repurchase amount authorized by an entity's Board of Directors under a stock repurchase plan.

+ References

No definition available.

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X

- Definition

Number of shares that have been repurchased during the period and are being held in treasury.

+ References

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 29, 30

-Article 5



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

-Publisher AICPA

-Name Accounting Principles Board Opinion (APB)

-Number 12

-Paragraph 10

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 04

-Article 3



Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 505

-SubTopic 10

-Section 50

-Paragraph 2

-URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644

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