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Subsequent Event - Additional Information (Detail) (USD $)
3 Months Ended 1 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Apr. 17, 2014
Subsequent Event
Dividend Declared
Subsequent Event [Line Items]      
Dividends declared $ 0.38 $ 0.36 $ 0.38
Dividend payable date     Jun. 13, 2014
Dividend payable, stockholders of record date     May 23, 2014
Dividend announcement date     Apr. 17, 2014