Annual report pursuant to Section 13 and 15(d)

Shareholders' (Deficit) Equity - Additional Information (Detail)

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Shareholders' (Deficit) Equity - Additional Information (Detail) - USD ($)
 1 Months Ended 2 Months Ended 3 Months Ended 12 Months Ended
May 07, 2014
Feb. 28, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Feb. 03, 2014
Jul. 30, 2012
Stockholders Equity [Line Items]                  
Common shares, shares outstanding         93,100,000 92,700,000 92,200,000    
Preference shares authorized         7,500,000        
Preference shares par value         $ 0.002        
Dividends paid         $ 0 $ 0 $ 30,400,000    
Dividends received primarily relating to forward transactions         $ 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         $ (66,300,000) (326,300,000)      
Repurchase of common stock, amount $ 266,000,000       $ 13,200,000 $ 16,600,000 $ 1,291,900,000    
Repurchase of common stock, shares     4,300,000   200,000 400,000 20,200,000    
Share repurchase program, remaining authorized capacity         $ 232,900,000        
Other comprehensive income (loss) before foreign currency translation adjustments reclassifications, Tax expense (benefits)         5,200,000 $ (7,200,000) $ (7,300,000)    
Other comprehensive Unrealized Gain (Loss) on Derivatives before reclassifications, Tax expense (benefits)         (300,000) (600,000) 600,000    
Other comprehensive Unrealized Gain (Loss) on Available-For-Sale Investments before reclassifications, Tax expense (benefits)           (900,000) 4,600,000    
Amounts reclassified from accumulated other comprehensive income (loss) to income, tax expense (benefits) unrealized gain (loss) on available-for-sale investments         $ 100,000 800,000 $ (4,500,000)    
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          
Non-cash forward transaction issuance costs       $ 35,800,000          
Non-cash interest expense relating to amortization of non-cash issuance costs         $ 6,500,000 $ 6,500,000 $ 5,800,000    
Shares Repurchased Including Forward Purchasing Transactions [Member]                  
Stockholders Equity [Line Items]                  
Repurchase of common stock, shares         0 0 19,700,000    
Amount paid related to share repurchased             $ 1,267,100,000    
Average cost per share of shares repurchased             $ 64.25