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Subsequent Event - Additional Information (Detail) - $ / shares
3 Months Ended
Apr. 20, 2016
Mar. 31, 2016
Mar. 31, 2015
Subsequent Event [Line Items]      
Dividends Declared Per Common Share (in USD per share)   $ 0.38 $ 0.38
Subsequent Event | Dividend Declared      
Subsequent Event [Line Items]      
Dividends Declared Per Common Share (in USD per share) $ 0.38