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Schedule II - Valuation and Qualifying Accounts (Detail) - Valuation Allowances for Deferred Tax Assets [Member] - USD ($) $ in Thousands | 12 Months Ended
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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

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