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Income Taxes - Additional Information (Detail) - USD ($) $ in Thousands | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Dec. 31, 2017
Income Taxes [Line Items] |  |  |
U.S. federal corporate statutory tax rate | 21.00% |  | 35.00%
Liability for uncertain tax positions totaled | $ 900 |  | $ 900
Deferred income tax expense | (1,079) | $ (164) |
Foreign Subsidiaries [Member] |  |  |
Income Taxes [Line Items] |  |  |
Deferred income tax expense | $ 500 |  | $ 0
Federal Authorities [Member] |  |  |
Income Taxes [Line Items] |  |  |
Open tax years | 2014 2015 2016 2017 2018 |  |
State and Foreign Authorities [Member] |  |  |
Income Taxes [Line Items] |  |  |
Open tax years | 2012 2013 2014 2015 2016 2017 2018 |  |

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