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Stock Repurchase Plan - Additional Information (Detail) (USD $)
 1 Months Ended 9 Months Ended 12 Months Ended 64 Months Ended 1 Months Ended
Sep. 21, 2012
Feb. 29, 2012
Sep. 30, 2012
Dec. 31, 2011
Sep. 30, 2012
Sep. 30, 2012
Maximum
Sep. 13, 2012
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          
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 4,600,000   29,596,000        
Common stock warrants repurchased 2,492,600            
Remaining value of shares authorized for purchase under the stock repurchase program           $ 76,300,000  
Remaining authorized shares for repurchase under the stock repurchase program           1,800,000