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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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