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Common Stock and Treasury Stock - Additional Information (Detail) (USD $)
 1 Months Ended 12 Months Ended 96 Months Ended 12 Months Ended 1 Months Ended 12 Months Ended
Sep. 21, 2012
Feb. 29, 2012
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2013
Jul. 31, 2013
Feb. 24, 2014
Subsequent Event
Dec. 31, 2013
Restricted share awards (RSAs)
Dec. 31, 2012
Restricted share awards (RSAs)
Dec. 31, 2011
Restricted share awards (RSAs)
Dec. 31, 2013
Long-term incentive program performance share awards
Sep. 13, 2012
Maximum
Dec. 31, 2013
Maximum
Maximum stock authorized to purchase under stock repurchase program   $ 262,100,000     $ 210,000,000               $ 113,000,000  
Increase in maximum stock authorized to purchase under stock repurchase program   52,100,000         100,000,000 100,000,000            
Stock authorized to purchase under stock repurchase program, shares                         2,500,000  
Cash settlement of common stock warrants 29,600,000     29,596,000                    
Common stock warrants repurchased 2,492,600                          
Repurchase of common stock, shares     1,656,808 1,437,692   11,176,680                
Repurchase of common stock, value     80,912,000 57,836,000   325,800,000                
Remaining value of shares authorized for purchase under the stock repurchase program                           $ 109,700,000
Number shares issued pursuant to stock option exercises     826,061 847,301 361,093                  
Number shares issued pursuant to restricted share award grants                 8,663 56,389 6,300      
Stock issued during the period restricted share awards                 8,663          
Stock issued during the period performance share award                       327,576