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Schedule II - Valuation and Qualifying Accounts (Detail) - Valuation Allowances for Deferred Tax Assets [Member] - 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 $ 159,540 $ 128,995 $ 116,718
Charged (Credited) to Statement of Operation 34,447 11,039 12,277
Charged to Other Accounts - Equity 0 19,506 0
Deductions, Net 0 0 0
Balance at End of Year $ 193,987 $ 159,540 $ 128,995