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Common Stock - Additional Information (Detail)	3 Months Ended
	Mar. 31, 2014	Nov. 30, 2006 Class B Minimum	Nov. 30, 2006 Class B Maximum
Equity, Class of Treasury Stock [Line Items]
Number of additional shares authorized to be repurchased		3,000,000	13,000,000
Treasury stock shares retired	174,808

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- Details

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X

- Definition

The remaining number of shares authorized to be repurchased by an entity's Board of Directors under a stock repurchase plan.

+ References

No definition available.

+ Details

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X

- Definition

Number of shares of common and preferred stock retired from treasury during the period.

+ References

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 04

-Article 3



Reference 2: 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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