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v2.4.1.9

Supplemental Guarantor Financial Information (Details) (USD $) In Millions, unless otherwise specified | Mar. 31, 2015 | Dec. 31, 2014
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7.25% senior notes due December 2018 |  |
Long-Term Debt |  |
Aggregate principal amount | $ 350.0 us-gaap_DebtInstrumentFaceAmount / us-gaap_LongtermDebtTypeAxis = exh_SeniorNotesDueDecember2018Member |
Interest rate (as a percent) | 7.25%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_LongtermDebtTypeAxis = exh_SeniorNotesDueDecember2018Member | 7.25%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_LongtermDebtTypeAxis = exh_SeniorNotesDueDecember2018Member
Guarantor Subsidiaries |  |
Long-Term Debt |  |
Ownership interest (as a percent) | 100.00%us-gaap_MinorityInterestOwnershipPercentageByParent / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |

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