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Dividends - Additional Information (Detail) (USD $)	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Mar. 31, 2012	Jun. 30, 2012	Jun. 30, 2011
Dividends [Line Items]
Total cash dividend paid	$ 10,956,000	$ 10,847,000	$ 21,803,000	$ 20,902,000
Dividend record date	Apr. 27, 2012	Feb. 24, 2012	Jul. 27, 2012
Dividend per common share to be paid	$ 0.16250	$ 0.16125	$ 0.16375
Dividend declared date			Jul. 10, 2012
Dividend payable date			Aug. 24, 2012

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

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 04

-Article 3



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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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