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Subsequent Events - 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
Aug. 01, 2014
Subsequent Events [Member]
Subsequent Event [Line Items]          
Date of announcement of dividend         Oct. 31, 2014
Dividends declared per share (in dollars per share) $ 0.11 $ 0.11 $ 0.33 $ 0.33 $ 0.11
Date of payment of dividend         Nov. 28, 2014
Date of record of dividend         Nov. 14, 2014