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Debt - Additional Information (Detail)
1 Months Ended
May 31, 2020
USD ($)
$ / shares
Oct. 31, 2018
USD ($)
Jun. 30, 2020
USD ($)
Dec. 31, 2019
USD ($)
Debt Instrument [Line Items]        
Carrying value of equity component     $ 1,500,000,000  
1.25% Senior Subordinated Convertible Notes Due in May 2027        
Debt Instrument [Line Items]        
Convertible notes stated rate     1.25% 1.25%
Debt discount     $ 13,269,000 $ 0
Carrying value of equity component     600,000,000 0
1.25% Senior Subordinated Convertible Notes Due in May 2027 | Senior Subordinated Notes        
Debt Instrument [Line Items]        
Debt face amount $ 600,000,000.0      
Convertible notes stated rate 1.25%      
Debt instrument, conversion ratio 7.2743      
Debt instrument, convertible, conversion price, per share (in dollars per share) | $ / shares $ 137.47      
Proceeds from issuance of notes $ 585,800,000      
Debt discount 13,500,000      
Debt issuance costs $ 700,000      
The 2018 Credit Facility        
Debt Instrument [Line Items]        
Debt issuance costs   $ 1,000,000.0    
Maximum borrowing capacity   200,000,000.0    
To repay early, minimum required amount outstanding with certain other conditions have not been met   $ 100,000,000.0    
Outstanding amount     $ 0 $ 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%