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Income Taxes - Additional Information (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017
Income Taxes [Line Items] |  |
Recognition of a valuation allowance against deferred tax assets in the U.S | $ 4,083 | $ 3,654
Effective tax rate | 21.00% | 34.00%
Earliest Tax Year |  |
Income Taxes [Line Items] |  |
Income tax examination by federal and state tax authorities | 2014 |
Latest Tax Year |  |
Income Taxes [Line Items] |  |
Income tax examination by federal and state tax authorities | 2018 |

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