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Income Taxes - Significant Components of Deferred Income Tax Assets and Liabilities (Detail) - USD ($)
$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Income Tax Disclosure [Abstract]    
Allowance for uncollectible accounts $ 135,280 $ 79,755
Reserves and accruals 55,549 64,445
Stock-based compensation 3,303 7,517
Operating loss and other carryforwards 29,045 16,767
Capital loss carryforwards 428,805 447,854
Operating lease assets 18,960 15,042
Property and equipment 1,967 3,044
Other 686 571
Deferred tax assets before valuation allowance 673,595 634,995
Less: Valuation allowance (441,529) (458,708)
Deferred tax assets, net of valuation allowance 232,066 176,287
Gross deferred tax liabilities:    
Amortization (168,505) (152,969)
Accounting method changes 0 (16,352)
Operating lease liabilities (16,439) (14,057)
Other (187) (183)
Total deferred tax liabilities (185,131) (183,561)
Net deferred tax (liabilities) assets $ (46,935) $ (7,274)