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Income Taxes - Additional Information (Detail) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Income Tax Reconciliation [Line Items] |  |  |  |
Income taxes |  | $ 13,152,000 | $ 5,698,000 | $ 5,031,000
Cash taxes paid net of refunds |  | $ 3,400,000 | $ 6,900,000 | $ 12,300,000
Tax Cuts and Jobs Act incomplete accouning transition tax unrepatriated earnings foreign subsidiaries payable period |  | 8 years |  |
U.S. federal statutory tax rate |  | 35.00% | 35.00% | 35.00%
Deferred tax assets, provisional decrease |  | $ 6,100 |  |
Deferred tax liability, provisional decrease |  | 2,900 |  |
Adjustment to deferred income tax expense |  | 3,200 |  |
Provisional transition tax expense |  | 3,800 |  |
Transition tax expense, affects tax rate |  | 2,600 |  |
Net operating loss carryforwards, indefinite |  | $ 10,000,000 |  |
Foreign net operating loss carryforwards expiration period start year |  | 2024 |  |
Foreign net operating loss carryforwards expiration period end year |  | 2027 |  |
Valuation allowance |  | $ 3,965,000 | $ 3,805,000 |
Net increase in valuation allowance from the prior year |  | 200,000 |  |
Recognized accrued interest and penalties reversed |  | 100,000 | 100,000 | $ 100,000
Payment of interest accrued |  | 0 | 0 | 100,000
Accrued penalties payment |  | 0 | 0 | 0
Unrecognized tax benefits that would impact effective tax rate |  | 0 | $ 0 | $ 200,000
Foreign Country [Member] |  |  |  |
Income Tax Reconciliation [Line Items] |  |  |  |
Net operating loss carryforwards |  | 11,300,000 |  |
Net operating loss carryforwards, definite |  | 1,000,000 |  |
Scenario Plan [Member] |  |  |  |
Income Tax Reconciliation [Line Items] |  |  |  |
U.S. federal statutory tax rate | 21.00% |  |  |
ASU 2016-09 [Member] |  |  |  |
Income Tax Reconciliation [Line Items] |  |  |  |
Excess tax benefit from stock-based compensation awards |  | $ 200,000 |  |

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