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Advances to and Investments in Foreign Joint Venture Operations - Additional Information (Detail) - USD ($) | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Apr. 30, 2007 | Dec. 31, 2006
Schedule Of Equity Method Investments [Line Items] |  |  |  |
Foreign joint ventures' operations related expenses | $ 142,000 | $ 250,000 |  |
BOMAY |  |  |  |
Schedule Of Equity Method Investments [Line Items] |  |  |  |
Equity method investment, ownership percentage | 40.00% |  |  |
Investment in joint ventures |  |  | $ 1,000,000 | $ 1,000,000
Equity income/loss from foreign joint venture operations | $ 950,000 | 430,000 |  |
Dividends received | 1,100,000 | 780,000 |  |
BOMAY | Affiliated Entity |  |  |  |
Schedule Of Equity Method Investments [Line Items] |  |  |  |
Accounts receivable from foreign joint venture | $ 0 | $ 40,000 |  |

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