XML 44 R50.htm IDEA: XBRL DOCUMENT
v2.4.0.8

Fair Value Measurements (Details 2) | 3 Months Ended | 1 Months Ended
--- | --- | ---
Jun. 30, 2012 Impaired fleet assets | Jun. 30, 2012 Impaired fleet assets Minimum | Jul. 31, 2013 Long-term receivable from the sale of Canadian Operations
Fair Value Measurements |  |  |
Disposition of impaired assets, time required |  | 12 months |
Weighted average disposal period of impaired assets | 4 years |  |
Discount rate (as a percent) | 10.40% |  | 13.00%
Settlement period |  |  | 5 years 6 months

X
- Definition Represents the period of time required to dispose of assets that the entity impaired. + References No definition available. + Details
Name: | exh_DispositionOfImpairedAssetsTimeRequired
Namespace Prefix: | exh_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the settlement period used as an input to measure fair value. + References No definition available. + Details
Name: | exh_FairValueInputsSettlementPeriod
Namespace Prefix: | exh_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Weighted average disposal period used to find the present value of an amount to be paid or received in the future as an input to measure fair value. + References No definition available. + Details
Name: | exh_FairValueInputsWeightedAverageDisposalPeriod
Namespace Prefix: | exh_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_FairValueInputsAssetsQuantitativeInformationLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Interest rate used to find the present value of an amount to be paid or received in the future as an input to measure fair value. For example, but not limited to, weighted average cost of capital (WACC), cost of capital, cost of equity and cost of debt. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bbb) -URI http://asc.fasb.org/extlink&oid=25499696&loc=d3e19207-110258 + Details
Name: | us-gaap_FairValueInputsDiscountRate
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration