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Debt - Credit Facilities (Detail) - USD ($)
$ in Thousands
Jun. 30, 2021
Dec. 31, 2020
Jun. 30, 2020
Dec. 31, 2019
Debt Disclosure [Abstract]        
Credit facility maximum borrowing capacity $ 5,036,000      
Borrowings outstanding 0      
Outstanding letters of credit 16,000      
Current availability 5,020,000      
Cash and cash equivalents 601,446 $ 598,086 $ 549,129 $ 1,088,855
Total liquidity $ 5,621,000