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Investments in Foreign Joint Ventures (Details Textual) (USD $) In Millions, unless otherwise specified			6 Months Ended
	Jun. 30, 2012	Dec. 31, 2011	Jun. 30, 2012 BOMAY [Member]	Jun. 30, 2012 Baoji Oilfield Machinery [Member]	Jun. 30, 2012 AA Energies [Member]	Jun. 30, 2012 MIEFE [Member]	Jun. 30, 2012 MIEFE's general manager [Member]	Jun. 30, 2012 Oakwell Engineering [Member]	Jun. 30, 2012 AAG [Member]	Jun. 30, 2012 Ltda [Member]
Investments In Foreign Joint Ventures (Textual) [Abstract]
Interest in Joint Venture			40.00%	51.00%	9.00%	41.00%	8.00%	51.00%	49.00%	51.00%
Accumulated statutory reserves in equity method investments	$ 1.6	$ 1.3

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Interest in joint venture.

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