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Advances to and Investments in Foreign Joint Ventures' Operations - Additional Information (Detail) | 1 Months Ended | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | ---
Nov. 30, 2017 USD ($) | Dec. 31, 2017 USD ($) | Sep. 30, 2017 USD ($) | Jun. 30, 2017 USD ($) | Mar. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | Sep. 30, 2016 USD ($) | Jun. 30, 2016 USD ($) | Mar. 31, 2016 USD ($) | Dec. 31, 2017 USD ($) Joint_Ventures | Dec. 31, 2016 USD ($) Joint_Ventures | Apr. 30, 2007 USD ($) | Dec. 31, 2006 USD ($)
Schedule Of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends received |  |  |  |  |  |  |  |  |  | $ 781,000 | $ 589,000 |  |
Net sales |  | $ 12,872,000 | $ 13,268,000 | $ 12,960,000 | $ 8,030,000 | $ 9,397,000 | $ 8,673,000 | $ 11,444,000 | $ 8,298,000 | $ 47,130,000 | $ 37,812,000 |  |
Interest in joint venture foreign | Joint_Ventures |  |  |  |  |  |  |  |  |  | 2 | 2 |  |
Foreign joint ventures' operations related expenses |  |  |  |  |  |  |  |  |  | $ 250,000 | $ 245,000 |  |
Equity Method Investments |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule Of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Accumulated statutory reserves in equity method investments |  | $ 2,809,000 |  |  |  | 2,887,000 |  |  |  | $ 2,809,000 | 2,887,000 |  |
BOMAY |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule Of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Equity method investment, ownership percentage |  | 40.00% |  |  |  |  |  |  |  | 40.00% |  |  |
Investment in joint ventures |  |  |  |  |  |  |  |  |  |  |  | $ 1,000,000 | $ 1,000,000
Equity income from foreign joint ventures' operations |  |  |  |  |  |  |  |  |  | $ 430,000 | 800,000 |  |
Dividends received |  |  |  |  |  |  |  |  |  | 780,000 | 590,000 |  |
BOMAY | Affiliated Entity |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule Of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  |  | 0 | 110,000 |  |
Accounts receivable from foreign joint venture |  | $ 0 |  |  |  | 40,000 |  |  |  | $ 0 | 40,000 |  |
MIEFE |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule Of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Equity method investment, ownership percentage |  | 41.00% |  |  |  |  |  |  |  | 41.00% |  |  |
Equity income from foreign joint ventures' operations |  |  |  |  |  |  |  |  |  | $ 220,000 | (270,000) |  |
Dividends received |  |  |  |  |  |  |  |  |  | 0 | 0 |  |
Written down of equity method investment |  |  |  |  |  |  |  |  |  | 0 |  |  |
Reversal of accrued losses | $ 220,000 |  |  |  |  |  |  |  |  |  |  |  |
MIEFE | Accrued in Accounts Payable and Other Liabilities |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule Of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Remaining investment from joint venture |  | $ 50,000 |  |  |  | 270,000 |  |  |  | 50,000 | 270,000 |  |
MIEFE | Affiliated Entity |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule Of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  |  | 0 | 0 |  |
Accounts receivable from foreign joint venture |  | $ 0 |  |  |  | $ 0 |  |  |  | $ 0 | $ 0 |  |

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