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Valuation and Qualifying Accounts and Reserves (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Valuation and Qualifying Accounts Disclosure [Line Items]      
Balance at Beginning of Year $ 61,000    
Balance at End of Year 11,400 $ 61,000  
Allowance for uncollectible accounts [Member]      
Valuation and Qualifying Accounts Disclosure [Line Items]      
Balance at Beginning of Year 86,369 12,110 $ 10,207
Charged to Expense 17,829 77,153 4,471
Deductions 13,444 2,894 2,568
Balance at End of Year 90,754 86,369 12,110
Valuation allowance for deferred and prepaid tax assets [Member]      
Valuation and Qualifying Accounts Disclosure [Line Items]      
Balance at Beginning of Year 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 61,338
Valuation allowance for deferred tax assets [Member]      
Valuation and Qualifying Accounts Disclosure [Line Items]      
Balance at Beginning of Year   $ 61,338 65,377
Charged to Expense     0
Deductions     4,039
Balance at End of Year     $ 61,338