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Schedule II - Valuation and Qualifying Accounts (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Movement in Valuation Allowances And Reserves [Roll Forward]      
Balance at Beginning of Period $ 94,561    
Balance at End of Period 126,589 $ 94,561  
Loss Reserve [Member]      
Movement in Valuation Allowances And Reserves [Roll Forward]      
Balance at Beginning of Period 94,561 90,775 $ 92,571
Expected Credit Losses 71,422 39,270 39,762
Write-offs, Net of Recoveries (39,394) (35,484) (41,558)
Balance at End of Period 126,589 94,561 90,775
Deferred income tax valuation allowance [Member]      
Movement in Valuation Allowances And Reserves [Roll Forward]      
Balance at Beginning of Period 2,574,056 2,477,703 2,513,738
Increase 301,539 96,353 0
Decrease 0 0 (36,035)
Balance at End of Period $ 2,875,595 $ 2,574,056 $ 2,477,703