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Income Taxes - Additional Information (Detail) - USD ($) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2018 | Dec. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Income Taxes |  |  |  |  |
Estimated one-time tax provision |  | $ 44,000,000 |  | $ 44,000,000 |
Transition tax |  |  | $ 28,935,000 |  |
Measurement period adjustment to reduce transition tax | $ 3,100,000 |  | 3,100,000 |  |
Provision for transition tax |  | 40,300,000 | 37,200,000 | $ 40,300,000 |
Transition tax paid |  |  | $ 8,300,000 |  |
Effective U.S corporate tax rate |  |  | 21.00% | 35.00% | 35.00%
Tax provision charge related to re-measurement of net deferred tax assets |  | 3,700,000 |  | $ 3,700,000 |
Undistributed foreign earnings |  |  | $ 197,400,000 |  |
Retained earnings |  | 526,633,000 | 549,134,000 | 526,633,000 |
Unrecognized tax benefits |  |  | 4,764,000 |  |
Unrecognized tax benefits would impact the effective tax rate |  |  | 4,200,000 |  |
Interest accrued |  | 600,000 | 705,000 | 600,000 |
Valuation allowances |  | 1,015,000 | 1,507,000 | 1,015,000 |
U.S |  |  |  |  |
Income Taxes |  |  |  |  |
Cash and cash equivalents and short-term investments |  | 293,800,000 | 173,600,000 | 293,800,000 |
Operating loss carryforwards |  | 0 | $ 0 | 0 |
U.S | Earliest Tax Year |  |  |  |  |
Income Taxes |  |  |  |  |
Tax years subject to examination |  |  | 2015 |  |
Foreign |  |  |  |  |
Income Taxes |  |  |  |  |
Cash and cash equivalents and short-term investments |  | 381,400,000 | $ 402,500,000 | 381,400,000 |
Retained earnings |  | 360,900,000 | 397,400,000 | 360,900,000 |
Operating loss carryforwards |  | 2,500,000 | $ 3,600,000 | 2,500,000 |
China | Tax Year 2008 |  |  |  |  |
Income Taxes |  |  |  |  |
Tax years settled which were under tax examination |  |  | 2008 |  |
China | Tax Year 2009 |  |  |  |  |
Income Taxes |  |  |  |  |
Tax years settled which were under tax examination |  |  | 2009 |  |
China | Tax Year 2010 |  |  |  |  |
Income Taxes |  |  |  |  |
Tax years settled which were under tax examination |  |  | 2010 |  |
China | Tax Year 2011 |  |  |  |  |
Income Taxes |  |  |  |  |
Tax years settled which were under tax examination |  |  | 2011 |  |
China | Tax Year 2012 |  |  |  |  |
Income Taxes |  |  |  |  |
Tax years settled which were under tax examination |  |  | 2012 |  |
China | Tax Year 2013 |  |  |  |  |
Income Taxes |  |  |  |  |
Tax years settled which were under tax examination |  |  | 2013 |  |
China | Tax Year 2014 |  |  |  |  |
Income Taxes |  |  |  |  |
Tax years settled which were under tax examination |  |  | 2014 |  |
China | Tax Year 2015 |  |  |  |  |
Income Taxes |  |  |  |  |
Tax years settled which were under tax examination |  |  | 2015 |  |
China | Tax Year 2016 |  |  |  |  |
Income Taxes |  |  |  |  |
Tax years settled which were under tax examination |  |  | 2016 |  |
Italy | Earliest Tax Year |  |  |  |  |
Income Taxes |  |  |  |  |
Tax years subject to examination |  |  | 2013 |  |
Poland | Earliest Tax Year |  |  |  |  |
Income Taxes |  |  |  |  |
Tax years subject to examination |  |  | 2014 |  |
Spain | Earliest Tax Year |  |  |  |  |
Income Taxes |  |  |  |  |
Tax years subject to examination |  |  | 2015 |  |
Germany | Earliest Tax Year |  |  |  |  |
Income Taxes |  |  |  |  |
Tax years subject to examination |  |  | 2016 |  |
United Kingdom | Earliest Tax Year |  |  |  |  |
Income Taxes |  |  |  |  |
Tax years subject to examination |  |  | 2016 |  |
Other Long-term Liabilities |  |  |  |  |
Income Taxes |  |  |  |  |
Transition tax |  | $ 36,800,000 | $ 28,900,000 | $ 36,800,000 |

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- Definition Cash includes currency on hand as well as demand deposits with banks or financial institutions. It also includes other kinds of accounts that have the general characteristics of demand deposits in that the customer may deposit additional funds at any time and effectively may withdraw funds at any time without prior notice or penalty. Cash equivalents, excluding items classified as marketable securities, include short-term, highly liquid Investments that are both readily convertible to known amounts of cash, and so near their maturity that they present minimal risk of changes in value because of changes in interest rates. Generally, only investments with original maturities of three months or less qualify under that definition. Original maturity means original maturity to the entity holding the investment. For example, both a three-month US Treasury bill and a three-year Treasury note purchased three months from maturity qualify as cash equivalents. However, a Treasury note purchased three years ago does not become a cash equivalent when its remaining maturity is three months. Short-term investments, exclusive of cash equivalents, generally consist of marketable securities intended to be sold within one year (or the normal operating cycle if longer) and may include trading securities, available-for-sale securities, or held-to-maturity securities (if maturing within one year), as applicable. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.1) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32537-109319 + Details
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