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BASIS OF PRESENTATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details 2) | 9 Months Ended
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Sep. 30, 2012
Minimum |
Revenue Recognition |
Duration of production and processing equipment fabrication project | 3 months
Maximum |
Revenue Recognition |
Duration of production and processing equipment fabrication project | 36 months

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- Definition Duration of production and processing equipment fabrication project. + References No definition available. + Details
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Namespace Prefix: | exh_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | exh_SummaryOfSignificantAccountingPoliciesLineItems
Namespace Prefix: | exh_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration