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Stockholders' Equity - Additional Information (Detail) (USD $)
In Thousands, except Share data, unless otherwise specified
 0 Months Ended 3 Months Ended 12 Months Ended
Jul. 25, 2011
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Equity [Abstract]                        
Common stock, value of shares authorized to repurchase $ 200,000                      
Stock repurchase, shares                   107,000 434,600  
Value of shares repurchased                   2,875 11,501 2,007
Average price of repurchased shares                   $ 26.87 $ 26.46  
Cash dividend paid   $ 0.16 $ 0.16 $ 0.16 $ 0.16 $ 0.16 $ 0.16 $ 0.15 $ 0.15 $ 0.64 $ 0.62 $ 0.60
Dividend payment to common shareholders                   $ 33,975 $ 32,686 $ 31,373
Dividend declared date                   Feb. 10, 2014    
Cash dividend to be paid                   $ 0.16    
Dividend to be paid date                   Mar. 14, 2014    
Dividend declared, shareholders of record date                   Mar. 03, 2014