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Revolving Line of Credit (Detail)
Oct. 20, 2021
USD ($)
May 08, 2018
USD ($)
Dec. 31, 2021
USD ($)
Line of Credit Facility [Line Items]      
Unsecured revolving line of credit $ 900,000,000 $ 600,000,000  
Revolving credit facility, expiration date   Aug. 19, 2026  
Credit facility restrictive covenant, maximum consolidated leverage ratio   3.50  
Credit facility restrictive covenant, maximum consolidated leverage ratio step up   4.00  
Interest coverage ratio   3.00  
Installment payments 3,750,000    
Borrowings outstanding $ 300,000,000    
Revolving Credit Facility      
Line of Credit Facility [Line Items]      
Borrowings outstanding     $ 50,000,000
Interest rate of borrowings outstanding     1.352%
Secured Debt      
Line of Credit Facility [Line Items]      
Interest rate of borrowings outstanding     1.354%
Loans Payable     $ 300,000,000
Loans Payable, Noncurrent     $ 285,000,000
Federal Fund Rate      
Line of Credit Facility [Line Items]      
Debt instrument basis spread on variable rate   0.50%  
LIBOR      
Line of Credit Facility [Line Items]      
Debt instrument basis spread on variable rate   1.00%  
LIBOR | Minimum      
Line of Credit Facility [Line Items]      
Debt instrument basis spread on variable rate   1.00%  
LIBOR | Maximum      
Line of Credit Facility [Line Items]      
Debt instrument basis spread on variable rate   1.75%  
Base Rate | Minimum      
Line of Credit Facility [Line Items]      
Debt instrument basis spread on variable rate   0.00%  
Base Rate | Maximum      
Line of Credit Facility [Line Items]      
Debt instrument basis spread on variable rate   0.75%