Valuation and Qualifying Accounts and Reserves (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Allowance for uncollectible accounts [Member]
Valuation and Qualifying Accounts Disclosure [Line Items]
Balance at Beginning of Year	$ 88,814
Charged to Expense	21,448
Deductions	552
Balance at End of Year	109,710	$ 88,814
Allowance for uncollectible accounts [Member] | Previously reported [Member]
Valuation and Qualifying Accounts Disclosure [Line Items]
Balance at Beginning of Year	90,754	86,369	$ 12,110
Charged to Expense		17,829	77,153
Deductions		13,444	2,894
Balance at End of Year		90,754	86,369
Valuation allowance for deferred tax assets [Member]
Valuation and Qualifying Accounts Disclosure [Line Items]
Balance at Beginning of Year	29,846
Charged to Expense	0
Deductions	1,433
Balance at End of Year	28,413	29,846
Valuation allowance for deferred and prepaid tax assets [Member]
Valuation and Qualifying Accounts Disclosure [Line Items]
Balance at Beginning of Year	$ 29,846	48,662	61,338
Charged to Expense		3,991	10,794
Deductions		22,807	23,470
Balance at End of Year		$ 29,846	$ 48,662