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v2.4.1.9

Fair Value Measurements (Details 2) | 12 Months Ended
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Dec. 31, 2013 | Dec. 31, 2014
Long-term receivable from the sale of Canadian Operations |  |
Fair value measurement of assets and liabilities |  |
Discount rate (as a percent) | 13.00%us-gaap_FairValueInputsDiscountRate / us-gaap_FairValueByAssetClassAxis = exh_LongTermReceivableFromSaleOfDiscontinuedOperationsMember |
Settlement period | 5 years 6 months |
Impaired long-lived assets |  |
Fair value measurement of assets and liabilities |  |
Weighted average disposal period of impaired assets |  | 4 years
Impaired long-lived assets | Weighted average |  |
Fair value measurement of assets and liabilities |  |
Discount rate (as a percent) |  | 9.00%us-gaap_FairValueInputsDiscountRate / us-gaap_FairValueByAssetClassAxis = exh_ImpairedLongLivedAssetsMember / us-gaap_RangeAxis = us-gaap_WeightedAverageMember

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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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- 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=36462937&loc=d3e19207-110258 + Details
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- Details
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- Details
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Data Type: | na
Balance Type: |
Period Type: |