Quarterly report pursuant to Section 13 or 15(d)

Shareholders' Deficit - Additional Information (Detail)

v3.3.0.814
Shareholders' Deficit - Additional Information (Detail) - USD ($)
 1 Months Ended 2 Months Ended 3 Months Ended 9 Months Ended
May. 07, 2014
Feb. 28, 2014
Jun. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Sep. 30, 2015
Sep. 30, 2014
Dec. 31, 2014
Feb. 03, 2014
Jul. 30, 2012
Stockholders Equity [Line Items]                        
Dividends paid       $ 0 $ 0     $ 0 $ 30,400,000      
Dividends received primarily relating to forward transactions       0 0     $ 0 3,400,000      
Share repurchase program authorized amount                     $ 1,500,000,000 $ 1,000,000,000
Share repurchase program expiration date               Jun. 30, 2017        
Accumulated deficit       (410,800,000)       $ (410,800,000)   $ (665,400,000)    
Additional paid-in-capital       436,300,000       436,300,000   $ 409,100,000    
Non-cash forward transaction issuance costs             $ 35,800,000          
Non-cash interest expense       $ 1,600,000 1,600,000     4,800,000 4,200,000      
Repurchase of common stock, amount $ 266,000,000             $ 10,700,000 1,278,400,000      
Repurchase of common stock, shares     4,300,000 0       0        
Amounts reclassified from accumulated other comprehensive income (loss) to income, tax expense unrealized gain (loss) on available-for-sale investments         2,400,000     $ 800,000 3,400,000      
Foreign Currency Translation Adjustments [Member]                        
Stockholders Equity [Line Items]                        
Other comprehensive income (loss) before reclassifications, Tax expense (benefits)       $ (2,700,000) (800,000)     (7,000,000) 700,000      
Unrealized Gain (Loss) on Derivatives [Member]                        
Stockholders Equity [Line Items]                        
Other comprehensive income (loss) before reclassifications, Tax expense (benefits)       (300,000) 500,000     200,000 200,000      
Amounts reclassified from accumulated other comprehensive income (loss) to income, tax expense (benefits) unrealized gain (loss) on derivatives       100,000       (100,000)        
Unrealized Gain (Loss) on Available-For-Sale Investments [Member]                        
Stockholders Equity [Line Items]                        
Other comprehensive income (loss) before reclassifications, Tax expense (benefits)         $ (2,500,000)     $ (1,000,000) $ (3,500,000)      
Capped call transactions [Member]                        
Stockholders Equity [Line Items]                        
Capped call transactions with financial institutions   $ 123,800,000                    
Capped call transactions price per common share   $ 120.79                    
Increase (decrease) in additional paid-in capital, other             (123,800,000)          
Capped call transactions [Member] | Convertible Notes [Member]                        
Stockholders Equity [Line Items]                        
Convertible notes initial conversion price   $ 86.28                    
Repurchase Agreement 2014 [Member]                        
Stockholders Equity [Line Items]                        
Agreement expiration date               Jun. 30, 2014        
Prepaid forward share repurchase transactions [Member]                        
Stockholders Equity [Line Items]                        
Forward share repurchase transactions amount   $ 685,800,000         $ 685,800,000          
Share repurchase transaction, shares to be purchased   9,900,000         9,900,000          
Settlement date of forward transactions               Aug. 15, 2019        
Accumulated deficit             $ (653,900,000)          
Additional paid-in-capital             $ (31,900,000)          
Average cost per share of shares repurchased             $ 69.02          
Share repurchase program, remaining authorized capacity       $ 232,900,000       $ 232,900,000        
Open market purchases [Member]                        
Stockholders Equity [Line Items]                        
Repurchase of common stock, shares         0 9,800,000            
Shares repurchased aggregate cost           $ 581,300,000            
Average cost per share of shares repurchased           $ 59.41