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Income Taxes - Additional Information (Details) - USD ($) $ in Thousands |  | 3 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Dec. 31, 2017 | Sep. 30, 2018 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Income Taxes [Line Items] |  |  |  |  |  |
Federal corporate income tax rate |  |  | 21.00% | 35.00% | 35.00% |
Deferred tax assets and liabilities income tax rate expected to reverse in future |  |  | 26.40% |  |  |
Increase in deferred tax provision for income taxes, including adjustments to valuation allowances |  |  | $ 1,000 |  |  |
Increase in valuation allowance | $ 2,200 |  |  |  |  |
Increase in cumulative foreign tax credit carry forward | 2,200 |  |  |  |  |
Increase (decrease) in provision for income tax |  | $ 1,100 |  |  |  |
Income taxes provided for additional outside basis difference inherent in entities as result of reinvestment |  |  | $ 8,200 |  |  |
Operating loss carryforwards expiration term |  |  | 20 years |  |  |
Deferred tax assets, valuation allowance | 1,636 |  | $ 5,112 | $ 1,636 | $ 1,131 | $ 933
Valuation allowance, deferred tax asset, increase (decrease), amount |  |  | 3,476 | 505 | 198 |
Unrecognized tax benefits | 820 |  | 216 | 820 | $ 1,185 | $ 400
Unrecognized tax benefits that would impact effective tax rate | 700 |  | 200 | 700 |  |
Unrecognized tax benefits, income tax penalties and interest accrued | 200 |  | $ 0 | 200 |  |
Earliest Tax Year | Internal Revenue Service (IRS) |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |
Open tax year |  |  | 2014 |  |  |
Earliest Tax Year | State and Foreign Jurisdictions |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |
Open tax year |  |  | 2014 |  |  |
Latest Tax Year | Internal Revenue Service (IRS) |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |
Open tax year |  |  | 2017 |  |  |
Latest Tax Year | State and Foreign Jurisdictions |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |
Open tax year |  |  | 2017 |  |  |
Foreign Tax Authority |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |
Operating loss carryforwards | 4,100 |  | $ 3,500 | 4,100 |  |
Deferred tax assets, valuation allowance | 1,100 |  | 1,100 | 1,100 |  |
Valuation allowance, deferred tax asset, increase (decrease), amount |  |  | 3,500 |  |  |
Domestic Tax Authority |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |
Operating loss carryforwards |  |  | $ 8,900 |  |  |
Net operating loss carry-forwards, expiration year |  |  | 2034 |  |  |
State and Local Jurisdiction |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |
Tax credit carry-forward, amount |  |  | $ 2,600 |  |  |
Deferred tax assets, tax credit carry-forwards | $ 1,785 |  | $ 2,041 | $ 1,785 |  |
State and Local Jurisdiction | Earliest Tax Year |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |
Tax credit carry-forwards, expiration year |  |  | 2021 |  |  |
State and Local Jurisdiction | Latest Tax Year |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |
Tax credit carry-forwards, expiration year |  |  | 2027 |  |  |

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