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Income Taxes - Significant Components of Deferred Income Tax Assets and Liabilities (Detail) - USD ($) $ in Thousands | Dec. 31, 2023 | Dec. 31, 2022
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Income Tax Disclosure [Abstract] |  |
Allowance for uncollectible accounts | $ 139,998 | $ 152,526
Reserves and accruals | 59,218 | 66,969
Stock-based compensation | 3,022 | 3,694
Operating loss and other carryforwards | 34,739 | 28,773
Capital loss carryforwards | 422,809 | 422,793
Operating lease assets | 19,133 | 19,096
Property and equipment | 2,056 | 2,481
Other | 5,520 | 256
Deferred tax assets before valuation allowance | 686,495 | 696,588
Less: Valuation allowance | (435,940) | (429,260)
Deferred tax assets, net of valuation allowance | 250,555 | 267,328
Gross deferred tax liabilities: |  |
Amortization | (162,538) | (176,398)
Operating lease liabilities | (17,342) | (16,510)
Other | (2,131) | (2,133)
Total deferred tax liabilities | (182,011) | (195,041)
Net deferred tax assets | $ 68,544 | $ 72,287

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