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Basis of Presentation and Summary of Significant Accounting Policies (Details) (USD $) In Millions, unless otherwise specified | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2014 | Jun. 30, 2014
Revenue Recognition |  |
Recorded revenue | $ 3.5 | $ 3.5
Minimum |  |
Revenue Recognition |  |
Duration of fabrication projects |  | 3 months
Maximum |  |
Revenue Recognition |  |
Duration of fabrication projects |  | 36 months

X
- Definition Represents revenues recognized in conjunction with the settlement of a claim on a construction project. + References No definition available. + Details
Name: | exh_ClaimsRevenue
Namespace Prefix: | exh_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Duration of fabrication projects. + References No definition available. + Details
Name: | exh_DurationOfFabricationProjects
Namespace Prefix: | exh_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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