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Other - Additional Information (Detail) (USD $)
3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Other [Line Items]    
Quarterly dividend declared $ 0.03750 $ 0.03125
Dividend declaration date Mar. 11, 2014  
Dividend payable date May 15, 2014  
Dividend declared, date of record May 01, 2014  
Dividend payable $ 505,000