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Investments in Foreign Joint Ventures - Additional Information (Detail)	3 Months Ended		6 Months Ended
	Jun. 30, 2018 USD ($)	Jun. 30, 2017 USD ($)	Jun. 30, 2018 USD ($) Joint_Ventures	Jun. 30, 2017 USD ($)
Schedule Of Equity Method Investments [Line Items]
Interest in joint venture foreign | Joint_Ventures			1
Net sales	$ 2,075,000	$ 1,331,000	$ 3,951,000	$ 2,546,000
Affiliated Entity
Schedule Of Equity Method Investments [Line Items]
Net sales	$ 0	$ 0	$ 0	$ 0
BOMAY
Schedule Of Equity Method Investments [Line Items]
Equity method investment, ownership percentage	40.00%		40.00%
Joint venture expiration year			2018
Joint venture term			12 years
Baoji Oilfield Machinery Co. Ltd.
Schedule Of Equity Method Investments [Line Items]
Interest in Joint Venture	51.00%		51.00%
AA Energies, Inc.
Schedule Of Equity Method Investments [Line Items]
Interest in Joint Venture	9.00%		9.00%

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