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Income Taxes - Additional Information (Detail) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Income Taxes [Line Items] |  |  |  |
Decrease in deferred tax liabilities | $ 22,345 |  |  |
Gross tax research other tax credit carryforwards | 36,496 |  |  |
Gross unrecognized tax benefits excluding interest and penalties | 27,345 | $ 25,465 | $ 4,332 | $ 19,610
Net unrecognized tax benefit excluding interest and penalties that would impact effective tax rate | 18,276 |  |  |
Net benefit to income tax expense, excluding interest and penalties, due to discrete reserve releases | 3,100 |  |  |
Accrued interest on unrecognized tax benefits | 327 | 491 | 157 |
Net unrecognized tax benefits, excluding interest and penalties, related to foreign tax positions | $ 1,025 |  |  |
Income tax examination, description | The U.S. statute of limitations remains open for tax years 2014 through present. The statute of limitations for the Company’s tax filings in other jurisdictions varies between fiscal years 2012 through the present. The Company also has certain federal credit carry-forwards and state tax loss and credit carry-forwards that are open to examination for tax years 2000 through the present. |  |  |
Change in valuation allowance | $ 1,102 | $ 6,400 | $ (20,636) |
Undistributed earnings of foreign subsidiaries | 560,000 |  |  |
Tax expense related to repatriation of foreign earnings | $ 27,610 |  |  |
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 | $ 12,559 |  |  |
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 | $ 43,431 |  |  |
Federal State and Foreign [Member] | 2017 [Member] |  |  |  |
Income Taxes [Line Items] |  |  |  |
Operating loss carry forwards | $ 37,098 |  |  |
Earliest Tax Year [Member] |  |  |  |
Income Taxes [Line Items] |  |  |  |
Open tax year | 2014 |  |  |

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- Definition A brief description of status of the tax examination, significant findings to date, and the entity's position with respect to the findings. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (d)(2) -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32718-109319 + Details
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