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Income Taxes - Additional Information (Detail) - USD ($) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Operating Loss Carryforwards [Line Items] |  |  |  |
Intercompany dividend | $ 8,825,000 | $ 10,000,000 | $ 30,650,000 |
Statutory tax rate | 34.00% | 34.00% | 35.00% |
Long-term deferred tax assets | $ 11,116,000 | $ 6,216,000 |  |
Unremitted foreign earnings available for distribution | 14,299,000 | 22,672,000 |  |
Deferred tax liability | 424,000 | 137,000 |  |
Amount of Unremitted foreign earnings permanently invested | 154,581,000 | 131,327,000 |  |
Amount subject to tax upon repatriation | (405,000) | 1,968,000 | $ (9,000) |
Amount of restricted stock and stock options tax benefits credited to additional paid-in capital |  | 318,000 | 253,000 |
Net increase (decrease) change in the valuation allowance | 7,445,000 | 11,219,000 | 101,000 |
Accrued interest or penalties for income tax liabilities | 51,000 | 0 |  |
Tax benefit reserve | 662,000 | 560,000 | 560,000 | $ 560,000
Impact of effective tax rate | 662,000 | $ 560,000 | $ 560,000 |
Deferred tax assets, reserve offset | 445,000 |  |  |
Income tax payable | 217,000 |  |  |
Estimated tax benefit | 445,000 |  |  |
Tax Credit Carry Forwards Expiring On 2023 [Member] |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |
Foreign tax credit carryforwards expire amount | $ 2,940,000 |  |  |
U.S. foreign tax credit carryforwards expiration | 2023 |  |  |
Tax Credit Carry Forwards Expiring On 2026 [Member] |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |
Foreign tax credit carryforwards expire amount | $ 4,087,000 |  |  |
U.S. foreign tax credit carryforwards expiration | 2026 |  |  |
Change in Accounting Method Accounted for as Change in Estimate [Member] |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |
Increase in provision for income taxes | $ 169,000 |  |  |
United States [Member] |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |
Cash in banks | 21,733,000 |  |  |
Outside United States [Member] |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |
Cash in banks | 27,612,000 |  |  |
Amount subject to tax upon repatriation | 27,332,000 |  |  |
Retained earnings to be available for distribution | 17,151,000 |  |  |
Outside United States [Member] | Permanently Invested [Member] |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |
Retained earnings to be available for distribution | $ 10,461,000 |  |  |

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