Subsequent Event - Additional Information (Detail) (USD $)	3 Months Ended
Apr. 30, 2013	May 16, 2013 Subsequent Event [Member]
Subsequent Event [Line Items]
Increase in quarterly dividend rate		6.00%
Subsequent Event related to quarterly dividend Per Share on Common Stock Declared by Board of Directors	$ 0.32	$ 0.34
Quarterly dividend declared date	May 16, 2013
Quarterly dividend payment date	Jul. 10, 2013
Quarterly dividend payment record date	Jun. 20, 2013

The percentage of increase in the common stock dividend rate.

No definition available.

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- Definition

Date the declared dividend will be paid, in CCYY-MM-DD format.

+ References

+ Details

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- Definition

The per share amount of a dividend declared, but not paid, as of the financial reporting date.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 50

-Paragraph 3

-URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4304-108586

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 95

-Paragraph 32

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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.

+ Details

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- Definition

Date the dividend to be paid was declared, in CCYY-MM-DD format.

+ References

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- Definition

Date the holder must own the stock to be entitled to the dividend, in CCYY-MM-DD format.

+ References

No definition available.

+ Details

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