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Investments in Foreign Joint Ventures - Additional Information (Detail) (USD $) | 6 Months Ended |
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Jun. 30, 2014 Joint_Ventures | Dec. 31, 2013
Schedule Of Equity Method Investments [Line Items] |  |
Interest in joint venture foreign | 2 |
Withdrawal from joint venture | $ 636,000 |
Proceeds from Interest in joint venture received | 46,000 |
Accumulated statutory reserves in equity method investments | 1,860,000 | 1,860,000
BOMAY |  |
Schedule Of Equity Method Investments [Line Items] |  |
Interest in Joint Venture | 40.00% |
Baoji Oilfield Machinery Co. Ltd. |  |
Schedule Of Equity Method Investments [Line Items] |  |
Interest in Joint Venture | 51.00% |
AA Energies, Inc. |  |
Schedule Of Equity Method Investments [Line Items] |  |
Interest in Joint Venture | 9.00% |
MIEFE |  |
Schedule Of Equity Method Investments [Line Items] |  |
Interest in Joint Venture | 41.00% |
MIEFE's general manager |  |
Schedule Of Equity Method Investments [Line Items] |  |
Interest in Joint Venture | 8.00% |
Sonepar of France |  |
Schedule Of Equity Method Investments [Line Items] |  |
Interest in Joint Venture | 51.00% |
AAG |  |
Schedule Of Equity Method Investments [Line Items] |  |
Interest in Joint Venture | 49.00% |
Withdrawal from joint venture | 636,000 |
Proceeds from Interest in joint venture received | $ 46,000 |
LTDA |  |
Schedule Of Equity Method Investments [Line Items] |  |
Interest in Joint Venture | 51.00% |

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- Definition The cash inflow from the sale of an investment interest in a joint venture that the reporting entity has not previously accounted for using consolidation or the equity method of accounting. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3179-108585 + Details
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