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DEBT - Additional Information (Detail)
1 Months Ended 12 Months Ended
May 31, 2020
USD ($)
$ / shares
Oct. 31, 2018
USD ($)
Aug. 31, 2017
USD ($)
$ / shares
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Oct. 15, 2018
$ / shares
Debt Instrument [Line Items]            
Carrying value of equity component       $ 1,100,000,000    
1.25% Senior Subordinated Convertible Notes Due in May 2027            
Debt Instrument [Line Items]            
Carrying value of equity component       $ 600,000,000 $ 0  
Debt instrument, interest rate, stated percentage, per annum       1.25%    
Debt Instrument, unamortized discount       $ 12,312,000 0  
1.25% Senior Subordinated Convertible Notes Due in May 2027 | Senior Subordinated Notes            
Debt Instrument [Line Items]            
Debt instrument, aggregate principal amount $ 600,000,000.0          
Conversion rate of shares 7.2743          
Debt instrument, convertible, conversion price, per share (in dollars per share) | $ / shares $ 137.47          
Proceeds from Issuance of Secured Debt $ 585,800,000          
Debt Instrument, unamortized discount 13,500,000          
Debt issuance costs $ 700,000          
0.599% Senior Subordinated Convertible Notes Due in August 2024            
Debt Instrument [Line Items]            
Carrying value of equity component       $ 495,000,000 495,000,000  
Debt instrument, aggregate principal amount     $ 495,000,000.0      
Debt instrument, interest rate, stated percentage, per annum       0.599%    
Conversion rate of shares     8.0212      
Debt instrument, convertible, conversion price, per share (in dollars per share) | $ / shares     $ 124.67      
Debt Instrument, unamortized discount     $ 9,900,000 $ 5,116,000 6,533,000  
Debt instrument percentage of face value     98.00%      
Principal amount on conversion rate     $ 1,000,000      
Net proceeds from offering debt     481,700,000      
Repurchase of note principal amount       100.00%    
Debt issuance costs       $ 3,400,000    
1.50% Senior Subordinated Convertible Notes Due in October 2020            
Debt Instrument [Line Items]            
Carrying value of equity component       $ 0 374,993,000  
Debt instrument, interest rate, stated percentage, per annum       1.50%    
Debt instrument, convertible, conversion price, per share (in dollars per share) | $ / shares           $ 94.15
Debt Instrument, unamortized discount       $ 0 $ 12,078,000  
Principal amount on conversion rate     $ 1,000      
The 2018 Credit Facility            
Debt Instrument [Line Items]            
Debt issuance costs   $ 1,000,000.0        
Maximum borrowing capacity   $ 200,000,000.0        
Outstanding amount       $ 0    
The 2018 Credit Facility | Minimum            
Debt Instrument [Line Items]            
Percentage of commitment fees payable on undrawn amount   0.15%        
The 2018 Credit Facility | Minimum | LIBOR Rate            
Debt Instrument [Line Items]            
Debt instrument interest rate percentage   1.00%        
The 2018 Credit Facility | Minimum | Base Rate            
Debt Instrument [Line Items]            
Debt instrument interest rate percentage   0.00%        
The 2018 Credit Facility | Maximum            
Debt Instrument [Line Items]            
Percentage of commitment fees payable on undrawn amount   0.35%        
The 2018 Credit Facility | Maximum | LIBOR Rate            
Debt Instrument [Line Items]            
Debt instrument interest rate percentage   1.95%        
The 2018 Credit Facility | Maximum | Base Rate            
Debt Instrument [Line Items]            
Debt instrument interest rate percentage   0.95%