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Stockholder's Equity - Additional Information (Detail) (USD $)
In Thousands, except Share data, unless otherwise specified
 0 Months Ended 3 Months Ended 6 Months Ended 0 Months Ended
Jul. 25, 2011
Jun. 30, 2014
Mar. 31, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Jul. 28, 2014
Subsequent Event [Member]
Stockholders Equity [Line Items]              
Common stock, value of shares authorized to repurchase $ 200,000            
Stock repurchase, shares         728,000    
Value of shares repurchased         20,809    
Average price of repurchased shares         $ 28.59    
Cash dividend paid   $ 0.165 $ 0.160 $ 0.160 $ 0.325 $ 0.320  
Dividend payment to common shareholders         $ 17,326 $ 16,951  
Dividend declared date         Jul. 28, 2014    
Cash dividend to be paid             $ 0.165
Dividend to be paid date         Sep. 12, 2014    
Dividend declared, shareholders of record date         Sep. 02, 2014