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Investments in Foreign Joint Ventures - Additional Information (Detail)	3 Months Ended			6 Months Ended
	Jun. 30, 2016 USD ($)	Mar. 31, 2016 USD ($)	Jun. 30, 2015 USD ($)	Jun. 30, 2016 USD ($) Joint_Ventures	Jun. 30, 2015 USD ($)
Schedule Of Equity Method Investments [Line Items]
Interest in joint venture foreign | Joint_Ventures				2
Net sales	$ 11,444,000		$ 12,302,000	$ 19,742,000	$ 27,613,000
Affiliated Entity
Schedule Of Equity Method Investments [Line Items]
Net sales	$ 0		$ 0	$ 40,000	$ 150,000
BOMAY
Schedule Of Equity Method Investments [Line Items]
Equity method investment, ownership percentage	40.00%			40.00%
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%
MIEFE
Schedule Of Equity Method Investments [Line Items]
Equity method investment, ownership percentage	41.00%			41.00%
Written down of equity method investment		$ 0
Losses recognized from investment				$ 270,000
MIEFE | Accrued in Other Current Liabilities
Schedule Of Equity Method Investments [Line Items]
Remaining investment from joint venture	$ 270,000			$ 270,000
MIEFE's general manager
Schedule Of Equity Method Investments [Line Items]
Interest in Joint Venture	8.00%			8.00%
Sonepar of France
Schedule Of Equity Method Investments [Line Items]
Interest in Joint Venture	51.00%			51.00%

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