XML 99 R119.htm IDEA: XBRL DOCUMENT
v2.4.0.6

Subsequent Event (Details Textual) (USD $) In Millions, unless otherwise specified | 1 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2011 MMcf hp CompressorUnits Person | Aug. 31, 2010 Person CompressorUnits hp | Dec. 31, 2011 MMcf Compressor CompressorUnits Customers hp
Subsequent Event (Textual) [Abstract] |  |  |
Number of customers to the partnership contract operations | 34 | 43 | 40
Number of compressor units used to provide compression services | 407 | 580 | 400
Horsepower of compressor units used to provide compression services | 289,000 | 255,000 | 188,000
Percentage of the combined contract operations | 8.00% | 6.00% | 5.00%
Capacity of natural gas processing plan | 8 |  | 10
Number of customer units included in assets sale | 207 |  | 140
Horsepower of compressor units | 98,000 |  | 75,000
Total consideration excluding transaction costs |  |  | $ 184

X
- Definition Capacity of natural gas processing plan. + References No definition available. + Details
Name: | exh_CapacityOfNaturalGasProcessingPlan
Namespace Prefix: | exh_
Data Type: | num:volumeItemType
Balance Type: | na
Period Type: | duration

X
- Definition Horse power of compressor units. + References No definition available. + Details
Name: | exh_HorsePowerOfCompressorUnits
Namespace Prefix: | exh_
Data Type: | num:powerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Horse power of compressor units used to provide compression services. + References No definition available. + Details
Name: | exh_HorsePowerOfCompressorUnitsUsedToProvideCompressionServices
Namespace Prefix: | exh_
Data Type: | num:powerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Number of compressor units used to provide compression services. + References No definition available. + Details
Name: | exh_NumberOfCompressorUnitsUsedToProvideCompressionServices
Namespace Prefix: | exh_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Number of customers to the partnership contract operations. + References No definition available. + Details
Name: | exh_NumberOfCustomersToPartnershipContractOperations
Namespace Prefix: | exh_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Number of customer units included in assets sale. + References No definition available. + Details
Name: | exh_NumberOfCustomerUnitsIncludedInAssetsSale
Namespace Prefix: | exh_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Percentage of combined contract operations. + References No definition available. + Details
Name: | exh_PercentageOfCombinedContractOperations
Namespace Prefix: | exh_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | exh_SubsequentEventTextualAbstract
Namespace Prefix: | exh_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of transactions with related party during the financial reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 850 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6457730&loc=d3e39549-107864 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 57 -Paragraph 2 -Subparagraph c -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 850 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6457730&loc=d3e39622-107864 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 850 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6457730&loc=d3e39603-107864 + Details
Name: | us-gaap_RelatedPartyTransactionAmountsOfTransaction
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration