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Equity - Additional Information (Detail) (USD $)
 3 Months Ended 9 Months Ended
Sep. 30, 2013
Dec. 31, 2012
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Equity Disclosure          
Preferred stock, shares authorized (in shares) 50,000,000 50,000,000   50,000,000  
Preferred stock, par value (in dollars per share) $ 0.001 $ 0.001   $ 0.001  
Preferred stock, shares designated (in shares) 7,700,000 7,700,000   7,700,000  
Preferred stock, conversion terms       Each outstanding share of convertible perpetual preferred stock is convertible at the holder’s option at any time into shares of the Company’s common stock at the specified conversion rate, subject to customary adjustments in certain circumstances. Each holder is entitled to an annual dividend payable semi-annually in cash, common stock or a combination thereof, at the Company’s election. The convertible perpetual preferred stock is not redeemable by the Company at any time. After the specified conversion date, the Company may cause all outstanding shares of the convertible perpetual preferred stock to convert automatically into common stock at the then-prevailing conversion rate if certain conditions are met.  
Purchase of treasury stock       $ (29,661,000)  
Retirement of treasury stock       0  
Stockholder settlement gross   5,000,000      
Additional paid-in capital—stockholder receivable (5,000,000) (5,000,000)   (5,000,000)  
Restricted common stock under incentive compensation plans, vesting period (in years)       4 years  
Stock-based compensation 6,800,000   9,100,000 77,500,000 30,700,000
Stock-based compensation, capitalized 1,300,000   1,800,000 4,300,000 5,700,000
8.5% Convertible perpetual preferred stock
          
Equity Disclosure          
Preferred stock, dividend rate, percentage       8.50% 8.50%
6.0% Convertible perpetual preferred stock
          
Equity Disclosure          
Preferred stock, dividend rate, percentage       6.00% 6.00%
7.0% Convertible perpetual preferred stock
          
Equity Disclosure          
Preferred stock, dividend rate, percentage       7.00% 7.00%
Treasury Stock
          
Equity Disclosure          
Purchase of treasury stock (in shares)       5,600,000 1,500,000
Purchase of treasury stock       (29,661,000) (11,100,000)
Retirement of treasury stock (in shares)       5,600,000 1,500,000
Retirement of treasury stock       29,661,000 11,100,000
Stockholder Rights Plan | Series A Junior Participating Preferred Stock
          
Equity Disclosure          
Number of Rights issued per common share 1     1  
Right expiration date       Apr. 29, 2013  
Separation of Former Executives
          
Equity Disclosure          
Stock-based compensation       $ 48,500,000