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Income Taxes - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Components Of Income Tax Expense Benefit [Line Items] |  |  |  |  |
Corporate income tax rate |  |  | 35.00% | 35.00% | 35.00%
Additional income tax expense benefit | $ 8,300 |  |  |  |
Tax cuts and jobs act of 2017 change in tax rate deferred tax assets and liability expected to reserve in future |  |  | $ 8,600 |  |
Change of intention for foreign earnings |  |  | 0 | $ 1,300 |
Tax cuts and jobs act of 2017 change in provisional income tax benefit |  |  | 300 |  |
Change in estimate, increase in net income |  |  |  | $ 2,400 |
Change in estimate, increase in earnings per share |  |  |  | $ 0.13 |
Net increase in valuation allowance |  |  | 4,600 |  |
Unremitted foreign earnings | 335,700 |  | $ 335,700 | $ 372,500 |
Minimum percentage of income tax benefit |  |  | 50.00% |  |
Gross unrecognized tax benefit | 22,500 |  | $ 22,500 | 18,400 |
Interest and penalties on unrecognized tax benefits |  |  | 2,300 | 2,100 | $ 200
Accrued interest and penalties related to unrecognized tax benefits | 5,300 |  | 5,300 | $ 3,000 |
Minimum [Member] |  |  |  |  |
Components Of Income Tax Expense Benefit [Line Items] |  |  |  |  |
Decrease in unrecognized tax benefits | 2,400 |  | 2,400 |  |
Maximum [Member] |  |  |  |  |
Components Of Income Tax Expense Benefit [Line Items] |  |  |  |  |
Decrease in unrecognized tax benefits | 3,600 |  | 3,600 |  |
State [Member] |  |  |  |  |
Components Of Income Tax Expense Benefit [Line Items] |  |  |  |  |
Operating loss carry forwards, net of tax | 11,600 |  | 11,600 |  |
Foreign Jurisdictions [Member] |  |  |  |  |
Components Of Income Tax Expense Benefit [Line Items] |  |  |  |  |
Operating loss carry forwards, net of tax | $ 167,300 |  | $ 167,300 |  |
Scenario, Forecast [Member] |  |  |  |  |
Components Of Income Tax Expense Benefit [Line Items] |  |  |  |  |
Corporate income tax rate |  | 21.00% |  |  |

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