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Cash Dividend Distribution - Additional Information (Detail) (USD $)
In Millions, except Per Share data, unless otherwise specified
 1 Months Ended 6 Months Ended 1 Months Ended
Apr. 30, 2013
Feb. 22, 2013
Jan. 15, 2013
Jun. 30, 2013
Jul. 30, 2013
Subsequent Events [Member]
Dividends Payable [Line Items]          
Cash dividend distribution $ 6.3 $ 6.3 $ 4.8    
Cash dividend declared, per share $ 0.143 $ 0.143 $ 0.109    
Dividend paid date       Jan. 15, 2013  
Dividend paid date Jul. 15, 2013 Apr. 15, 2013     Oct. 15, 2013
Cash dividend declared         $ 6.3
Cash dividend declared, per share         $ 0.143