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Long-Term Debt (Details 3) (USD $) In Millions, unless otherwise specified	1 Months Ended		12 Months Ended
	Mar. 31, 2013 Partnership's revolving credit facility and term loan facility	Nov. 30, 2010 Partnership's revolving credit facility and term loan facility	Dec. 31, 2013 Partnership's revolving credit facility and term loan facility	Dec. 31, 2012 Partnership's revolving credit facility and term loan facility	Dec. 31, 2011 Partnership's revolving credit facility and term loan facility	Dec. 31, 2013 Partnership's revolving credit facility and term loan facility LIBOR	Dec. 31, 2013 Partnership's revolving credit facility and term loan facility LIBOR Low end of range	Dec. 31, 2013 Partnership's revolving credit facility and term loan facility LIBOR High end of range	Dec. 31, 2013 Partnership's revolving credit facility and term loan facility Base rate loans	Dec. 31, 2013 Partnership's revolving credit facility and term loan facility Base rate loans Low end of range	Dec. 31, 2013 Partnership's revolving credit facility and term loan facility Base rate loans High end of range	Dec. 31, 2013 Partnership's revolving credit facility and term loan facility Federal Funds	Dec. 31, 2013 Partnership's revolving credit facility and term loan facility one-month LIBOR	Dec. 31, 2013 Partnership's revolving credit facility	Mar. 31, 2013 Partnership's revolving credit facility	Mar. 31, 2012 Partnership's revolving credit facility	Mar. 31, 2011 Partnership's revolving credit facility	Nov. 30, 2010 Partnership's revolving credit facility	Nov. 30, 2010 Partnership's term loan facility
Long-Term Debt
Expiration period of credit facility		5 years
Revolving credit facility borrowing capacity		$ 550.0													$ 650.0	$ 750.0	$ 550.0	$ 400.0	$ 150.0
Write-off of deferred financing costs	0.7
Transaction costs			4.3	0.5	1.0
Undrawn capacity under revolving credit facility														387.0
Available borrowings under revolving credit facility														$ 387.0
Debt instrument, variable rate basis						LIBOR			base rate			Federal Funds Effective Rate	one-month LIBOR
Debt instrument, basis spread on variable rate (as a percent)						2.00%	2.00%	3.00%		1.00%	2.00%	0.50%	1.00%
Weighted average annual interest rate (as a percent)			2.20%
Minimum EBITDA to total interest expense ratio			2.75
Maximum total debt to EBITDA ratio			5.25
Maximum revised total debt to EBITDA ratio			5.5
Revised total debt to EBITDA ratio, applicable period after acquisition	6 months
Maximum senior secured debt to EBITDA ratio			4.0

X

- Definition

Represents the revised maximum ratio of total debt to EBITDA following occurrence of certain events under the partnership credit agreement.

+ References

No definition available.

+ Details

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X

- Definition

Represents the applicable period of the revised maximum ratio of total debt to EBITDA after the closure of acquisition under the partnership credit agreement.

+ References

No definition available.

+ Details

Name:	exh_DebtInstrumentFinancialCovenantMaximumRevisedTotalDebtToEBITDARatioPeriodAfterAcquisitionClosure
Namespace Prefix:	exh_
Data Type:	xbrli:durationItemType
Balance Type:	na
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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
Balance Type:	na
Period Type:	duration

X

- Definition

Represents the maximum ratio of total debt to EBITDA under the partnership credit agreement.

+ References

No definition available.

+ Details

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Namespace Prefix:	exh_
Data Type:	xbrli:pureItemType
Balance Type:	na
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X

- Definition

Represents the minimum ratio of adjusted EBITDA to total interest expense under the partnership credit agreement.

+ References

No definition available.

+ Details

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Namespace Prefix:	exh_
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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

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
Balance Type:	na
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X

- Definition

The reference rate for the variable rate of the debt instrument, such as LIBOR or the US Treasury rate and the maturity of the reference rate used, such as three months or six months LIBOR.

+ References

No definition available.

+ Details

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X

- Details

Name:	us-gaap_DebtInstrumentLineItems
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Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Amount of debt issuance costs (for example, but not limited to, legal, accounting, broker, and regulatory fees).

+ References

No definition available.

+ Details

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- Definition

Weighted average interest rate of debt outstanding.

+ References

No definition available.

+ Details

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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

Name:	us-gaap_LineOfCreditFacilityExpirationPeriod
Namespace Prefix:	us-gaap_
Data Type:	xbrli:durationItemType
Balance Type:	na
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X

- 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

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- 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

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Balance Type:	credit
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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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