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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
Jul. 25, 2011
Mar. 31, 2014
Mar. 31, 2013
Equity [Abstract]      
Common stock, value of shares authorized to repurchase $ 200,000    
Stock repurchase, shares   32,000  
Value of shares repurchased   945  
Average price of repurchased shares   $ 29.81  
Cash dividend paid   $ 0.16 $ 0.16
Dividend payment to common shareholders   $ 8,553 $ 8,448
Dividend declared date   May 05, 2014  
Cash dividend to be paid   $ 0.165  
Dividend to be paid date   Jun. 13, 2014  
Dividend declared, shareholders of record date   Jun. 02, 2014