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Schedule II - Valuation and Qualifying Accounts (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Valuation Allowances for Deferred Tax Assets [Member]      
Valuation And Qualifying Accounts Disclosure [Line Items]      
Balance at Beginning of Year $ 213,847 $ 193,987 $ 159,540
Charged (Credited) to Statement of Operation 123,977 19,860 34,447
Charged to Other Accounts - Liabilities and Equity 0 0 0
Deductions, Net 0 0 0
Balance at End of Year 337,824 213,847 193,987
Valuation Allowance for Rebates and Discounts [Member]      
Valuation And Qualifying Accounts Disclosure [Line Items]      
Balance at Beginning of Year 1,102 0  
Charged (Credited) to Statement of Operation 16,497 1,102  
Charged to Other Accounts - Liabilities and Equity (14,867) 0  
Deductions, Net (2,184) 0  
Balance at End of Year $ 548 $ 1,102 $ 0