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Income Taxes - Additional Information (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Income Taxes [Line Items] |  |  |
Provisional estimate recorded related to re-measurement of deferred tax balance | $ 34,600 |  |
Provisional amount recorded in connection with the transition tax offset by foreign tax credits | 7,700 |  |
Amount expected to be utilized of tax credit carry forwards expiring in the and beyond the stated year | 2,000 |  |
Valuation allowance | 20,178 | $ 18,907 |
Unrecognized tax benefits, impact on effective tax rate | 2,800 | 500 | $ 500
Accrued interest and penalties | 100 | 100 | 200
Increase (decrease) in income tax expense |  | $ (100) | $ (2,300)
Unrecognized tax benefits, gross | 100 |  |
Foreign Countries |  |  |
Income Taxes [Line Items] |  |  |
Valuation allowance | 18,700 |  |
Foreign Countries |  |  |
Income Taxes [Line Items] |  |  |
Net operating loss carryforwards, foreign | 26,400 |  |
California enterprise zone |  |  |
Income Taxes [Line Items] |  |  |
California enterprise zone tax credits | 3,500 |  |
California enterprise zone | California Enterprise Zone |  |  |
Income Taxes [Line Items] |  |  |
Valuation allowance | $ 1,500 |  |

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- Definition Amount before allocation of valuation allowances of deferred tax asset attributable to deductible foreign operating loss carryforwards. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32621-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32632-109319 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 25 -Paragraph 20 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=96869850&loc=d3e28680-109314 + Details
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- Definition The increase (decrease) during the reporting period in the amounts payable to taxing authorities for taxes that are based on the reporting entity's earnings, net of amounts receivable from taxing authorities for refunds of overpayments or recoveries of income taxes, and in deferred and other tax liabilities and assets. + References No definition available. + Details
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