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Reconciliation Between Income Tax Expenses (Parenthetical) (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017
Income Tax Disclosure [Abstract] |  |
One-time charge to true-up deferred taxes | $ 1,913 |
One-time benefit due to re-measurement of net deferred tax liabilities |  | $ (79,834)
Deemed repatriation tax amount |  | 14,512
Reduction in deferred tax assets with regard to foreign tax credit carryforwards | $ 17,267 | $ 20,433

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