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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 |  |  |
Period over which fleet assets are to be disposed of |  | 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

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- Definition Represents the settlement period used as an input to measure fair value. + References No definition available. + Details
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- 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
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Namespace Prefix: | exh_
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Balance Type: | na
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- Definition The minimum period of time the entity expects it to take to dispose of the impaired long-lived assets. + References No definition available. + Details
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Namespace Prefix: | exh_
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- Details
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- 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
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