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Dividends Declared (Detail) (USD $)
3 Months Ended 9 Months Ended 1 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Jul. 25, 2013
July 2013
Jul. 25, 2013
August 2013
Jul. 25, 2013
September 2013
Oct. 10, 2013
Subsequent event
October 2013
Oct. 10, 2013
Subsequent event
November 2013
Oct. 10, 2013
Subsequent event
December 2013
Dividends Payable [Line Items]                    
Record Date         Aug. 05, 2013 Aug. 30, 2013 Sep. 30, 2013 Oct. 31, 2013 Nov. 29, 2013 Dec. 31, 2013
Payment Date         Aug. 15, 2013 Sep. 13, 2013 Oct. 15, 2013 Nov. 15, 2013 Dec. 16, 2013 Jan. 15, 2014
Dividend Declared Per Share $ 0.16 $ 0.15 $ 0.47 $ 0.45 $ 0.05333 $ 0.05333 $ 0.05333 $ 0.05333 $ 0.05333 $ 0.05333