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Income Taxes - Additional Information (Detail) - USD ($) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Income Taxes [Line Items] |  |  |  |
U.S. federal corporate income tax rate | 21.00% | 35.00% | 35.00% |
Adjustment to provisional tax benefit | $ 625,000 |  |  |
Increase of effective tax rate | 0.40% |  |  |
Additional deferred tax provision | $ 2,614 | $ 22,345 |  |
Gross tax research other tax credit carryforwards | 29,858,000 |  |  |
Accrued interest on unrecognized tax benefits | 568,000 | 327,000 | $ 491,000 |
Gross unrecognized tax benefits excluding interest and penalties | 32,684,000 | 27,345,000 | 25,465,000 | $ 4,332,000
Net unrecognized tax benefits, excluding interest and penalties, related to foreign tax positions | 2,150,000 |  |  |
Change in valuation allowance | 4,307,000 | 1,102,000 | $ 6,400,000 |
Undistributed earnings of foreign subsidiaries | 521,000,000 | 560,000,000 |  |
Tax expense related to repatriation of foreign earnings | $ 4,624,000 | $ 27,610,000 |  |
Minimum [Member] |  |  |  |
Income Taxes [Line Items] |  |  |  |
Income tax holiday tax rate | 7.50% |  |  |
Maximum [Member] |  |  |  |
Income Taxes [Line Items] |  |  |  |
Income tax holiday tax rate | 16.00% |  |  |
Indefinite [Member] |  |  |  |
Income Taxes [Line Items] |  |  |  |
Gross tax research other tax credit carryforwards | $ 15,081,000 |  |  |
Federal State and Foreign [Member] |  |  |  |
Income Taxes [Line Items] |  |  |  |
Tax credit expiration period | 2035 |  |  |
Federal State and Foreign [Member] | Indefinite [Member] |  |  |  |
Income Taxes [Line Items] |  |  |  |
Operating loss carry forwards | $ 36,057,000 |  |  |
Federal State and Foreign [Member] | 2017 [Member] |  |  |  |
Income Taxes [Line Items] |  |  |  |
Operating loss carry forwards | $ 43,715,000 |  |  |

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