XML 26 R42.htm IDEA: XBRL DOCUMENT
v2.4.0.8

Basis of Presentation and Summary of Significant Accounting Policies (Details) (USD $) In Millions, unless otherwise specified | 9 Months Ended
--- | ---
Sep. 30, 2014
Revenue Recognition |
Recorded revenue | $ 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