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Common Stock and Treasury Stock - Additional Information (Detail) (USD $)
 1 Months Ended 9 Months Ended 12 Months Ended 84 Months Ended 1 Months Ended 12 Months Ended
Sep. 21, 2012
Sep. 13, 2012
Feb. 29, 2012
Sep. 30, 2012
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2012
Dec. 31, 2012
Maximum
Dec. 31, 2012
Restricted share awards (RSAs)
Dec. 31, 2011
Restricted share awards (RSAs)
Dec. 31, 2010
Restricted share awards (RSAs)
Maximum stock authorized to purchase under stock repurchase program   $ 113,000,000 $ 262,100,000     $ 210,000,000            
Increase in maximum stock authorized to purchase under stock repurchase program     52,100,000                  
Repurchase of common stock, shares         1,437,692     9,519,872        
Repurchase of common stock, value         57,836,000     244,900,000        
Stock authorized to purchase under stock repurchase program, shares   2,500,000                    
Cash settlement of common stock warrants 5,600,000     29,600,000 29,596,000              
Common stock warrants repurchased 2,492,600                      
Remaining value of shares authorized for purchase under the stock repurchase program                 $ 78,900,000      
Remaining authorized shares for repurchase under the stock repurchase program                 1,800,000      
Number shares issued pursuant to stock option exercises         847,301 361,093 235,986          
Number shares issued pursuant to restricted share award grants                   56,389 6,300 25,950
Stock issued during the period restricted share awards                   226,594