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Debt Facilities - Additional Information 1 (Detail)
1 Months Ended 6 Months Ended
Apr. 30, 2015
USD ($)
Mar. 31, 2015
$ / shares
shares
Jun. 30, 2015
USD ($)
$ / shares
shares
Jun. 30, 2014
USD ($)
Apr. 30, 2015
GBP (£)
Apr. 30, 2015
USD ($)
Apr. 30, 2015
CHF (SFr)
Apr. 30, 2015
EUR (€)
Apr. 30, 2015
JPY (¥)
Debt Instrument [Line Items]                  
Prepayment of principal balance of outstanding term loan     $ 518,629,000 $ 27,094,000          
Senior credit facility [Member]                  
Debt Instrument [Line Items]                  
Line of credit facility, maximum borrowing capacity           $ 1,500,000,000      
Senior credit facility [Member] | Term loan facility [Member]                  
Debt Instrument [Line Items]                  
Line of credit facility, maximum borrowing capacity           500,000,000      
U.S. term loan [Member]                  
Debt Instrument [Line Items]                  
Line of credit facility, maximum borrowing capacity         £ 92,586,000 490,000,000 SFr 47,780,000 € 184,945,000 ¥ 11,924,000,000
Prepayment of principal balance of outstanding term loan $ 490,000,000                
Credit facility, frequency of payment     Quarterly            
Debt instrument, repayment terms     The Company will repay the Term Loan Facility in equal quarterly installments on the last business day of each March, June, September and December, commencing on June 30, 2015, equal to the amount of 2.00% of the result of the respective Term Loan Facility on April 30, 2015 divided by 0.98.            
Revolving credit facility [Member] | Senior credit facility [Member]                  
Debt Instrument [Line Items]                  
Line of credit facility, maximum borrowing capacity           $ 1,000,000,000      
4.75% Convertible subordinated notes [Member]                  
Debt Instrument [Line Items]                  
Subordinated notes converted into common stock | shares     1,964,879            
Convertible debt interest rate     4.75% 4.75%          
Convertible debt maturity date     Jun. 15, 2016            
Capped call premium, total     $ 49,664,000            
Convertible subordinated notes, converted number of common stock | shares     4,432,638            
Capped call redemption | shares   1,232,808              
4.75% Convertible subordinated notes [Member] | Minimum [Member]                  
Debt Instrument [Line Items]                  
Conversion price per share | $ / shares     $ 84.32            
4.75% Convertible subordinated notes [Member] | Minimum [Member] | Capped Call [Member]                  
Debt Instrument [Line Items]                  
Conversion price per share | $ / shares   $ 80.36              
4.75% Convertible subordinated notes [Member] | Maximum [Member]                  
Debt Instrument [Line Items]                  
Conversion price per share | $ / shares     $ 114.82            
4.75% Convertible subordinated notes [Member] | Maximum [Member] | Capped Call [Member]                  
Debt Instrument [Line Items]                  
Conversion price per share | $ / shares   $ 109.34