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Dividends - Additional Information (Detail) (USD $)	3 Months Ended			9 Months Ended
	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Sep. 30, 2012	Sep. 30, 2011
Dividends [Line Items]
Total cash dividend paid	$ 11,063,000	$ 10,956,000	$ 10,847,000	$ 32,866,000	$ 31,494,000
Dividend record date	Jul. 27, 2012	Apr. 27, 2012	Feb. 24, 2012	Oct. 26, 2012
Dividend per common share to be paid	$ 0.16375	$ 0.16250	$ 0.16125	$ 0.165
Dividend declared date				Oct. 09, 2012
Dividend payable date				Nov. 30, 2012

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Aggregate dividends declared during the period for each share of common stock outstanding.

+ 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

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

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-Name Accounting Standards Codification

-Topic 230

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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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

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Cash outflow in the form of ordinary dividends to common shareholders, generally out of earnings.

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-Name Accounting Standards Codification

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