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Income Taxes - Additional Information (Detail) - USD ($) $ in Thousands | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Income Taxes [Line Items] |  |  |  |
Income tax benefit from new interpretation of tax law |  | $ 600 |  |
Long-term net deferred tax assets | $ 9,800 | 13,100 |  |
Long-term net deferred tax liabilities | 100 | 200 |  |
Valuation allowance | $ 2,193 | 1,534 | $ 1,565 | $ 2,200
Operating loss carryforwards, expired | 2020 |  |  |
Operating loss carryforwards related to a prior acquisition | $ 3,500 |  |  |
U.S. federal and state capital loss carryforwards | 3,400 |  |  |
Deferred tax assets, Capital loss carryforwards expires in 2018 | 400 |  |  |
Deferred tax assets, Capital loss carryforwards expires in 2020 | 1,600 |  |  |
Deferred tax assets, Capital loss carryforwards expires in 2021 | 1,400 |  |  |
Net tax deficiencies from tax deductions less than book deductions resulting from employee stock option exercises | 100 | 200 |  |
Undistributed earnings of company's foreign subsidiaries | 27,800 |  |  |
Unrecognized tax benefits | 1,774 | 1,910 | 2,136 | $ 2,012
Unrecognized tax benefits will be recognized within next twelve months | 1,100 |  |  |
Accrued interest and penalties related to uncertain tax positions | 100 | $ 200 | $ 200 |
Domestic Tax Authority [Member] |  |  |  |
Income Taxes [Line Items] |  |  |  |
Operating loss carryforwards | 700 |  |  |
Foreign Tax Authority [Member] |  |  |  |
Income Taxes [Line Items] |  |  |  |
Operating loss carryforwards | $ 20,400 |  |  |

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