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Investments in Foreign Joint Ventures - Additional Information (Details) - USD ($)	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Schedule of Equity Method Investments [Line Items]
Revenues	$ 17,664,000	$ 13,838,000
Affiliated Entity
Schedule of Equity Method Investments [Line Items]
Revenues	$ 0	$ 0
Bomay
Schedule of Equity Method Investments [Line Items]
Equity method investment, ownership percentage	40.00%
Bomay | Baoji Oilfield Machinery Co., Ltd.
Schedule of Equity Method Investments [Line Items]
Equity method investment, ownership percentage	51.00%
Bomay | AA Energies, Inc.
Schedule of Equity Method Investments [Line Items]
Equity method investment, ownership percentage	9.00%

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