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Shareholders' Equity - Additional Information (Detail) (USD $)
 1 Months Ended 3 Months Ended 12 Months Ended 1 Months Ended 12 Months Ended 1 Months Ended
Jul. 28, 2013
Dec. 31, 2012
Sep. 30, 2012
Jul. 01, 2012
Apr. 01, 2012
Dec. 31, 2013
vote_per_share
Right
Dec. 31, 2012
Dec. 31, 2011
Apr. 30, 2008
2008 Stock Repurchase Program [Member]
Dec. 31, 2013
2008 Stock Repurchase Program [Member]
Nov. 30, 2011
2011 Stock Repurchase Program [Member]
Dec. 31, 2013
2011 Stock Repurchase Program [Member]
Equity [Line Items]                        
Authorized shares           400,000            
Preferred stock, par value           $ 0.01            
Vote entitled for each common share outstanding           1            
Stock split conversion ratio 2         2            
Common stock, par value   $ 0.002 [1]       $ 0.002 [1] $ 0.002 [1]          
Number of preferred stock purchase right for dividend distribution           1            
Outstanding common shares percentage to be acquired           15.00%            
Repurchase of authorized common stock                 $ 50,000,000   $ 80,000,000  
Repurchase of shares                   3,578,000   892,000
Repurchase of shares, value                   50,000,000   27,908,000
Repurchase of shares during period                   827,000    
Repurchase of shares during period, value           47,908,000   10,000,000   20,000,000    
Cash dividend declared per common share   $ 0.055 $ 0.055 $ 0.055 $ 0.050              
Additional dividend declared and paid   $ 0.055                    
Special dividend declared and paid   $ 0.50                    
Payment of dividends           0 66,213,000 15,114,000        
Dividend declared           $ 0            
[1] Prior period amounts have been adjusted to reflect the two-for-one stock split effected in the form of a stock dividend which occurred in the third quarter of 2013.