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Income Taxes - Additional Information (Detail) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018 | Dec. 31, 2018
Income Taxes [Line Items] |  |  |  |  |
Liability for uncertain tax positions | $ 500 |  | $ 500 |  | $ 900
Deferred income taxes on undistributed earnings |  |  | (595) | $ (1,079) |
Income tax expense (benefit) | $ 739 | $ 1,337 | $ (2,569) | $ 6,764 |
Effective income tax rate | 27.70% | (11.50%) | (38.10%) | (524.70%) |
Zhongli [Member] |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |
Income tax expense (benefit) |  |  | $ (4,400) |  |
Foreign Subsidiaries [Member] |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |
Deferred income taxes on undistributed earnings |  |  | $ 0 |  | $ 600
Federal Authorities [Member] |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |
Open tax years |  |  | 2014 2015 2016 2017 2018 2019 |  |
State and Foreign Authorities [Member] |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |
Open tax years |  |  | 2014 2015 2016 2017 2018 2019 |  |

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