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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