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Long-Lived Asset Impairment (Detail) (USD $) In Millions, unless otherwise specified | 3 Months Ended | 12 Months Ended
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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 | $ 11.9 us-gaap_ImpairmentOfLongLivedAssetsToBeDisposedOf / us-gaap_StatementBusinessSegmentsAxis = exh_FabricationMember | $ 11.9 us-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 |  | 280 exh_LongLivedAssetsToBeRetired / us-gaap_ImpairedLongLivedAssetsHeldAndUsedByTypeAxis = exh_IdleCompressorUnitsMember | 310 exh_LongLivedAssetsToBeRetired / us-gaap_ImpairedLongLivedAssetsHeldAndUsedByTypeAxis = exh_IdleCompressorUnitsMember | 930 exh_LongLivedAssetsToBeRetired / us-gaap_ImpairedLongLivedAssetsHeldAndUsedByTypeAxis = exh_IdleCompressorUnitsMember
Horsepower retired from the contract operations business |  | 76,000 exh_LongLivedAssetsToBeRetiredHorsepower / us-gaap_ImpairedLongLivedAssetsHeldAndUsedByTypeAxis = exh_IdleCompressorUnitsMember | 131,000 exh_LongLivedAssetsToBeRetiredHorsepower / us-gaap_ImpairedLongLivedAssetsHeldAndUsedByTypeAxis = exh_IdleCompressorUnitsMember | 318,000 exh_LongLivedAssetsToBeRetiredHorsepower / us-gaap_ImpairedLongLivedAssetsHeldAndUsedByTypeAxis = exh_IdleCompressorUnitsMember
Long-lived asset impairment |  | 14.9 us-gaap_ImpairmentOfLongLivedAssetsHeldForUse / us-gaap_ImpairedLongLivedAssetsHeldAndUsedByTypeAxis = exh_IdleCompressorUnitsMember | 33.3 us-gaap_ImpairmentOfLongLivedAssetsHeldForUse / us-gaap_ImpairedLongLivedAssetsHeldAndUsedByTypeAxis = exh_IdleCompressorUnitsMember | 97.1 us-gaap_ImpairmentOfLongLivedAssetsHeldForUse / us-gaap_ImpairedLongLivedAssetsHeldAndUsedByTypeAxis = exh_IdleCompressorUnitsMember
Idle compressor units previously impaired |  |  |  |
Long-Lived Asset Impairment |  |  |  |
Long-lived asset impairment |  |  | 12.7 us-gaap_ImpairmentOfLongLivedAssetsHeldForUse / us-gaap_ImpairedLongLivedAssetsHeldAndUsedByTypeAxis = exh_IdleCompressorUnitsPreviouslyImpairedMember | 34.8 us-gaap_ImpairmentOfLongLivedAssetsHeldForUse / us-gaap_ImpairedLongLivedAssetsHeldAndUsedByTypeAxis = exh_IdleCompressorUnitsPreviouslyImpairedMember
Other long lived assets |  |  |  |
Long-Lived Asset Impairment |  |  |  |
Long-lived asset impairment |  | $ 1.8 us-gaap_ImpairmentOfLongLivedAssetsHeldForUse / us-gaap_ImpairedLongLivedAssetsHeldAndUsedByTypeAxis = exh_OtherLongLivedAssetsMember | $ 0.7 us-gaap_ImpairmentOfLongLivedAssetsHeldForUse / us-gaap_ImpairedLongLivedAssetsHeldAndUsedByTypeAxis = exh_OtherLongLivedAssetsMember | $ 4.7 us-gaap_ImpairmentOfLongLivedAssetsHeldForUse / us-gaap_ImpairedLongLivedAssetsHeldAndUsedByTypeAxis = exh_OtherLongLivedAssetsMember

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- Definition The number of long-lived assets that the entity determined to retire and either sell or re-utilize key components. + References No definition available. + Details
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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 No definition available. + Details
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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 Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=8077374&loc=d3e2420-110228 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6391110&loc=d3e2921-110230 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 958 -SubTopic 225 -Section 45 -Paragraph 11 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=28367520&loc=d3e92212-112881 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Impairment -URI http://asc.fasb.org/extlink&oid=6515133 + Details
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- Definition The aggregate amount of write-downs for impairments recognized during the period for long-lived assets held for abandonment, exchange or sale. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 45 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=8077374&loc=d3e2611-110228 + Details
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