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Subsequent Event - Additional Information (Detail) (USD $)
3 Months Ended 9 Months Ended 0 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Oct. 16, 2014
Subsequent Event
Dividend Declared
Subsequent Event [Line Items]          
Dividends declared $ 0.38 $ 0.36 $ 1.14 $ 1.08 $ 0.38
Dividend payable date         Dec. 12, 2014
Dividend payable, stockholders of record date         Nov. 26, 2014
Dividend announcement date         Oct. 16, 2014