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Investments in Foreign Joint Ventures - Schedule of Activity in Investment in Foreign Joint Ventures (Parenthetical) (Detail) - USD ($)	1 Months Ended
	Mar. 31, 2018	Dec. 31, 2017
Equity Method Investments
Schedule Of Equity Method Investments [Line Items]
Accumulated statutory reserves in equity method investments	$ 2,809,000	$ 2,809,000
BOMAY
Schedule Of Equity Method Investments [Line Items]
Dividend payable, date declared	2018-03
Distribution of dividends	$ 2,910,000
Dividend payable, date to be paid	2018-06
BOMAY | Prepaid Expenses and Other Current Assets
Schedule Of Equity Method Investments [Line Items]
Accrued dividend receivable	$ 1,050,000

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Amount of paid and unpaid common stock dividends declared with the form of settlement in cash.

+ References

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-Name Accounting Standards Codification
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