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Long-Term Debt (Details 2) (Revolving credit facility due July 2016, USD $) In Millions, unless otherwise specified | 1 Months Ended | 3 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Jul. 31, 2011 | Mar. 31, 2012 | Dec. 31, 2014 | Dec. 31, 2013
Long-Term Debt |  |  |  |
Expiration period of credit facility | 5 years |  |  |
Revolving credit facility borrowing capacity | $ 1,100.0 us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity | $ 900.0 us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity |  |
Write-off of deferred financing costs |  | 1.3 us-gaap_WriteOffOfDeferredDebtIssuanceCost |  |
Weighted average annual interest rate (as a percent) |  |  | 1.70%us-gaap_DebtWeightedAverageInterestRate | 1.70%us-gaap_DebtWeightedAverageInterestRate
Outstanding borrowings |  |  | 375.5 us-gaap_LineOfCredit |
Outstanding letters of credit |  |  | 93.9 us-gaap_LettersOfCreditOutstandingAmount |
Undrawn capacity under revolving credit facility |  |  | 430.6 us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity |
Available borrowings under revolving credit facility |  |  | 430.6 exh_LineOfCreditFacilityCurrentAvailableBorrowingCapacity |
Percentage of equity interests in first tier foreign subsidiaries |  |  | 65.00%exh_PercentageOfEquityInterestsInFirstTierForeignSubsidiaries |
Maximum additional commitment amount |  |  | $ 300.0 exh_LineOfCreditFacilityAdditionalCommitmentsMaximum |
Minimum adjusted EBITDA to total interest expense ratio |  |  | 2.25 exh_DebtInstrumentFinancialCovenantMinimumAdjustedEBITDAToTotalInterestExpensesRatio |
Maximum consolidated total debt to adjusted EBITDA ratio |  |  | 5.0 exh_DebtInstrumentFinancialCovenantMaximumConsolidatedTotalDebtToAdjustedEBITDARatio |
Maximum senior secured debt to EBITDA ratio |  |  | 4.0 exh_DebtInstrumentFinancialCovenantMaximumSeniorSecuredDebtToAdjustedEBITDA |
LIBOR |  |  |  |
Long-Term Debt |  |  |  |
Debt instrument, basis spread on variable rate (as a percent) |  |  | 1.50%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 / us-gaap_CreditFacilityAxis = exh_RevolvingCreditFacilityDueJuly2016Member / us-gaap_VariableRateAxis = us-gaap_LondonInterbankOfferedRateLIBORMember |
LIBOR | Minimum |  |  |  |
Long-Term Debt |  |  |  |
Debt instrument, basis spread on variable rate (as a percent) |  |  | 1.50%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 / us-gaap_CreditFacilityAxis = exh_RevolvingCreditFacilityDueJuly2016Member / us-gaap_RangeAxis = us-gaap_MinimumMember / us-gaap_VariableRateAxis = us-gaap_LondonInterbankOfferedRateLIBORMember |
LIBOR | Maximum |  |  |  |
Long-Term Debt |  |  |  |
Debt instrument, basis spread on variable rate (as a percent) |  |  | 2.50%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 / us-gaap_CreditFacilityAxis = exh_RevolvingCreditFacilityDueJuly2016Member / us-gaap_RangeAxis = us-gaap_MaximumMember / us-gaap_VariableRateAxis = us-gaap_LondonInterbankOfferedRateLIBORMember |
Base rate loans | Minimum |  |  |  |
Long-Term Debt |  |  |  |
Debt instrument, basis spread on variable rate (as a percent) |  |  | 0.50%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 / us-gaap_CreditFacilityAxis = exh_RevolvingCreditFacilityDueJuly2016Member / us-gaap_RangeAxis = us-gaap_MinimumMember / us-gaap_VariableRateAxis = us-gaap_BaseRateMember |
Base rate loans | Maximum |  |  |  |
Long-Term Debt |  |  |  |
Debt instrument, basis spread on variable rate (as a percent) |  |  | 1.50%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 / us-gaap_CreditFacilityAxis = exh_RevolvingCreditFacilityDueJuly2016Member / us-gaap_RangeAxis = us-gaap_MaximumMember / us-gaap_VariableRateAxis = us-gaap_BaseRateMember |
Federal Funds |  |  |  |
Long-Term Debt |  |  |  |
Debt instrument, basis spread on variable rate (as a percent) |  |  | 0.50%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 / us-gaap_CreditFacilityAxis = exh_RevolvingCreditFacilityDueJuly2016Member / us-gaap_VariableRateAxis = exh_DebtInstrumentVariableRateBaseFederalFundsMember |
one-month LIBOR |  |  |  |
Long-Term Debt |  |  |  |
Debt instrument, basis spread on variable rate (as a percent) |  |  | 1.00%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 / us-gaap_CreditFacilityAxis = exh_RevolvingCreditFacilityDueJuly2016Member / us-gaap_VariableRateAxis = exh_DebtInstrumentVariableRateBaseOneMonthLIBORMember |

X
- Definition Represents the maximum ratio of consolidated total debt to adjusted EBITDA. + References No definition available. + Details
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Namespace Prefix: | exh_
Data Type: | xbrli:pureItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the maximum ratio of senior secured debt to adjusted EBITDA. + References No definition available. + Details
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Namespace Prefix: | exh_
Data Type: | xbrli:pureItemType
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X
- Definition Represents the minimum ratio of adjusted EBITDA to total interest expense. + References No definition available. + Details
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Namespace Prefix: | exh_
Data Type: | xbrli:pureItemType
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X
- Definition The maximum amount of additional aggregate commitments allowed under the credit facility which is subject to certain conditions and with the approval of the lenders. + References No definition available. + Details
Name: | exh_LineOfCreditFacilityAdditionalCommitmentsMaximum
Namespace Prefix: | exh_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount of current borrowing capacity under the credit facility considering any current restrictions on the amount that could be borrowed (for example, borrowings may be limited by the amount of current assets) and considering any amounts currently outstanding. + References No definition available. + Details
Name: | exh_LineOfCreditFacilityCurrentAvailableBorrowingCapacity
Namespace Prefix: | exh_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Represents the percentage of equity interests in first tier foreign subsidiaries held by the entity used to secure borrowings. + References No definition available. + Details
Name: | exh_PercentageOfEquityInterestsInFirstTierForeignSubsidiaries
Namespace Prefix: | exh_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Percentage points added to the reference rate to compute the variable rate on the debt instrument. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
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X
- Details
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Period Type: | duration

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- Definition Weighted average interest rate of debt outstanding. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
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X
- Definition The total amount of the contingent obligation under letters of credit outstanding as of the reporting date. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.16) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 20, 22 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.16) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
Name: | us-gaap_LineOfCredit
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Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Period remaining on line of credit facility before it terminates, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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- Definition Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5 + Details
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Namespace Prefix: | us-gaap_
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Balance Type: | credit
Period Type: | instant

X
- Definition Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5 + Details
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Balance Type: | credit
Period Type: | instant

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- Definition Write-off of amounts previously capitalized as debt issuance cost in an extinguishment of debt. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.8) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 + Details
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