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Long-Lived Asset Impairment (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended	12 Months Ended
	Jun. 30, 2013	Dec. 31, 2013	Dec. 31, 2014 hp CompressorUnit	Dec. 31, 2012 hp CompressorUnit
Fabrication
Long-Lived Asset Impairment
Impairment of long-lived asset held for sale	$ 11.9us-gaap_ImpairmentOfLongLivedAssetsToBeDisposedOf / us-gaap_StatementBusinessSegmentsAxis = exh_FabricationMember	$ 11.9us-gaap_ImpairmentOfLongLivedAssetsToBeDisposedOf / us-gaap_StatementBusinessSegmentsAxis = exh_FabricationMember
Idle compressor units
Long-Lived Asset Impairment
Number of long-lived assets that the entity determined to retire and either sell or re-utilize key components		280exh_LongLivedAssetsToBeRetired / us-gaap_ImpairedLongLivedAssetsHeldAndUsedByTypeAxis = exh_IdleCompressorUnitsMember	310exh_LongLivedAssetsToBeRetired / us-gaap_ImpairedLongLivedAssetsHeldAndUsedByTypeAxis = exh_IdleCompressorUnitsMember	930exh_LongLivedAssetsToBeRetired / us-gaap_ImpairedLongLivedAssetsHeldAndUsedByTypeAxis = exh_IdleCompressorUnitsMember
Horsepower retired from the contract operations business		76,000exh_LongLivedAssetsToBeRetiredHorsepower / us-gaap_ImpairedLongLivedAssetsHeldAndUsedByTypeAxis = exh_IdleCompressorUnitsMember	131,000exh_LongLivedAssetsToBeRetiredHorsepower / us-gaap_ImpairedLongLivedAssetsHeldAndUsedByTypeAxis = exh_IdleCompressorUnitsMember	318,000exh_LongLivedAssetsToBeRetiredHorsepower / us-gaap_ImpairedLongLivedAssetsHeldAndUsedByTypeAxis = exh_IdleCompressorUnitsMember
Long-lived asset impairment		14.9us-gaap_ImpairmentOfLongLivedAssetsHeldForUse / us-gaap_ImpairedLongLivedAssetsHeldAndUsedByTypeAxis = exh_IdleCompressorUnitsMember	33.3us-gaap_ImpairmentOfLongLivedAssetsHeldForUse / us-gaap_ImpairedLongLivedAssetsHeldAndUsedByTypeAxis = exh_IdleCompressorUnitsMember	97.1us-gaap_ImpairmentOfLongLivedAssetsHeldForUse / us-gaap_ImpairedLongLivedAssetsHeldAndUsedByTypeAxis = exh_IdleCompressorUnitsMember
Idle compressor units previously impaired
Long-Lived Asset Impairment
Long-lived asset impairment			12.7us-gaap_ImpairmentOfLongLivedAssetsHeldForUse / us-gaap_ImpairedLongLivedAssetsHeldAndUsedByTypeAxis = exh_IdleCompressorUnitsPreviouslyImpairedMember	34.8us-gaap_ImpairmentOfLongLivedAssetsHeldForUse / us-gaap_ImpairedLongLivedAssetsHeldAndUsedByTypeAxis = exh_IdleCompressorUnitsPreviouslyImpairedMember
Other long lived assets
Long-Lived Asset Impairment
Long-lived asset impairment		$ 1.8us-gaap_ImpairmentOfLongLivedAssetsHeldForUse / us-gaap_ImpairedLongLivedAssetsHeldAndUsedByTypeAxis = exh_OtherLongLivedAssetsMember	$ 0.7us-gaap_ImpairmentOfLongLivedAssetsHeldForUse / us-gaap_ImpairedLongLivedAssetsHeldAndUsedByTypeAxis = exh_OtherLongLivedAssetsMember	$ 4.7us-gaap_ImpairmentOfLongLivedAssetsHeldForUse / us-gaap_ImpairedLongLivedAssetsHeldAndUsedByTypeAxis = exh_OtherLongLivedAssetsMember

X

- Definition

The number of long-lived assets that the entity determined to retire and either sell or re-utilize key components.

+ References

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- Definition

The capacity of long-lived assets that the entity determined to retire and either sell or re-utilize key components, expressed in horsepower.

+ References

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- Definition

The aggregate amount of write-downs for impairments recognized during the period for long lived assets held for use (including those held for disposal by means other than sale).

+ References

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The aggregate amount of write-downs for impairments recognized during the period for long-lived assets held for abandonment, exchange or sale.

+ References

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-Publisher FASB

-Name Accounting Standards Codification

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