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Stockholder's Equity - Additional Information (Detail) (USD $)
In Thousands, except Share data, unless otherwise specified
 1 Months Ended 3 Months Ended 9 Months Ended
Jul. 25, 2011
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Sep. 30, 2013
Sep. 30, 2012
Equity [Abstract]                  
Common stock, value of shares authorized to repurchase $ 200,000                
Stock repurchase, shares               107,000  
Value of shares repurchased               2,875  
Average price of repurchased shares               $ 26.87  
Cash dividend paid   $ 0.16 $ 0.16 $ 0.16 $ 0.16 $ 0.15 $ 0.15 $ 0.48 $ 0.46
Dividend payment to common shareholders               $ 25,458 $ 24,261
Dividend declared date               Oct. 28, 2013  
Cash dividend to be paid   $ 0.16              
Dividend to be paid date               Dec. 13, 2013  
Dividend declared, shareholders of record date               Dec. 02, 2013