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Debt - Additional Information 4 (Detail) (USD $)
 6 Months Ended 1 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended
Jun. 30, 2013
Feb. 22, 2013
1.875% Convertible Senior Notes due 2013 [Member]
May 16, 2008
1.875% Convertible Senior Notes due 2013 [Member]
Jun. 30, 2013
1.875% Convertible Senior Notes due 2013 [Member]
May 01, 2013
1.875% Convertible Senior Notes due 2013 [Member]
Feb. 01, 2013
1.875% Convertible Senior Notes due 2013 [Member]
Jun. 30, 2013
1.875% Convertible Senior Notes due 2013 [Member]
Class A Common Stock [Member]
Jun. 30, 2013
1.875% Convertible Senior Notes due 2013 [Member]
Class A Common Stock [Member]
Line of Credit Facility [Line Items]                
Convertible senior notes issued     $ 550,000,000          
Equity component related to repurchases, convertible, effective interest rate     1.875% 1.875%        
Debt instrument, issuance date     May 16, 2008          
Interest payable dates       May 1 and November 1        
Debt instrument, maturity date     May 01, 2013 May 01, 2013        
Conversion rate, in shares     24.1196          
Common stock principal amount     1,000          
Per share conversion price     $ 41.46          
Conversion premium     20.00%          
Last reported selling price     $ 34.55          
Issuance of stock for conversion of debt 18,134,000 18,100,000            
Issuance of common stock   437,134            
Exercised share warrants net   71,054            
Settlement of future conversion obligations           100.00%    
Additional conversion notices aggregate value       450,600,000        
Converted Notes held by subsidiary       81,200,000        
Convertible indenture notes       1,764.02        
Convertible price per notes       $ 1,000        
Convertible notes aggregate value       794,800,000        
Aggregate principal amount       142,000        
Proceeds from settlement of convertible bond hedges 182,853,000     182,900,000        
Initial strike price of warrants               $ 67.37
Common stock warrants outstanding         13,200,000      
Company paid in cash to unwind shares             $ 23,600,000  
Underlying shares of the Company's Class A common stock             2,800,000  
Common stock warrants expiration period               60 days
Common stock warrants expiration period beginning date               Aug. 01, 2013