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Fair Value Measurements (Details) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2011 | Dec. 31, 2010
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Summarizes the valuation of interest rate swaps and impaired assets |  |
Interest rate swaps asset (liability) | $ (19,446) | $ (29,025)
Foreign currency derivatives asset (liability) |  | (462)
Impaired long-lived assets | 1,642 | 70,637
Aftermarket services goodwill | 0 |
Fabrication goodwill | 0 |
Quoted Market Prices in Active Markets (Level 1) [Member] |  |
Summarizes the valuation of interest rate swaps and impaired assets |  |
Interest rate swaps asset (liability) | 0 | 0
Foreign currency derivatives asset (liability) |  | 0
Impaired long-lived assets | 0 | 0
Aftermarket services goodwill | 0 |
Fabrication goodwill | 0 |
Significant Other Observable Inputs (level 2) [Member] |  |
Summarizes the valuation of interest rate swaps and impaired assets |  |
Interest rate swaps asset (liability) | (19,446) | (29,025)
Foreign currency derivatives asset (liability) |  | (462)
Impaired long-lived assets | 0 | 0
Aftermarket services goodwill | 0 |
Fabrication goodwill | 0 |
Significant Unobservable Inputs (Level 3) [Member] |  |
Summarizes the valuation of interest rate swaps and impaired assets |  |
Interest rate swaps asset (liability) | 0 | 0
Foreign currency derivatives asset (liability) |  | 0
Impaired long-lived assets | 1,642 | 70,637
Aftermarket services goodwill | 0 |
Fabrication goodwill | $ 0 |

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- Definition After market services goodwill fair value disclosure. + References No definition available. + Details
Name: | exh_AfterMarketServicesGoodwillFairValueDisclosure
Namespace Prefix: | exh_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Fabrication goodwill fair value disclosure. + References No definition available. + Details
Name: | exh_FabricationGoodwillFairValueDisclosure
Namespace Prefix: | exh_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Foreign currency derivatives fair value disclosure. + References No definition available. + Details
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Namespace Prefix: | exh_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Interest rate swaps asset liability fair value disclosure. + References No definition available. + Details
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Namespace Prefix: | exh_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Long-lived asset impairment fair value disclosure. + References No definition available. + Details
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Namespace Prefix: | exh_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Details
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