Income Taxes - Significant Components of Deferred Income Tax Assets and Liabilities (Detail) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
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