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Commitments and Contingencies (Details 2) (USD $) In Millions, unless otherwise specified	3 Months Ended	12 Months Ended	27 Months Ended
	Mar. 31, 2014 case	Dec. 31, 2013 case	Mar. 31, 2014
Business acquisition, contingent consideration
Accrued liability for the outcomes of non-income based tax audits	$ 10.5	$ 16.1	$ 10.5
Litigation and Claims
Number of heavy equipment statutes cases tried and completed in Texas state district court	3	3
Number of other state district court cases in which the entity filed motions for summary judgment	2	2
Ad valorem tax benefit	2.3		17.1
Ad valorem tax benefit agreed to by a number of appraisal review boards and county appraisal districts	3.3		3.3
Ad valorem tax benefit in litigation	13.8		13.8
Maximum
Business acquisition, contingent consideration
Contingent payments	$ 46		$ 46

X

- Definition

The amount of ad valorem tax expense (benefit) included as a component of cost of goods sold (excluding depreciation and amortization).

+ References

No definition available.

+ Details

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Namespace Prefix:	exh_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

The amount of ad valorem tax expense (benefit) agreed to by one or more appraisal review boards and/or county appraisal districts.

+ References

No definition available.

+ Details

Name:	exh_AdValoremTaxExpenseBenefitApproved
Namespace Prefix:	exh_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

The amount of ad valorem tax expense (benefit) in litigation in various courts.

+ References

No definition available.

+ Details

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Namespace Prefix:	exh_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Represents the number of heavy equipment statutes cases tried and completed to which the entity is a party.

+ References

No definition available.

+ Details

Name:	exh_NumberOfHeavyEquipmentStatuesCasesTriedAndCompletedToWhichEntityIsParty
Namespace Prefix:	exh_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Number of state district court cases in which the entity filed motion for summary judgment.

+ References

No definition available.

+ Details

Name:	exh_NumberOfStateDistrictCourtCasesInWhichEntityFiledMotionForSummaryJudgment
Namespace Prefix:	exh_
Data Type:	xbrli:integerItemType
Balance Type:	na
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X

- Details

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Data Type:	xbrli:stringItemType
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Period Type:	duration

X

- Definition

For contingent consideration arrangements recognized in connection with a business combination, this element represents an estimate of the high-end of the potential range (undiscounted) of the consideration which may be paid.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 805

-SubTopic 30

-Section 50

-Paragraph 1

-Subparagraph (c)(3)

-URI http://asc.fasb.org/extlink&oid=7488404&loc=d3e6927-128479

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
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X

- Definition

Amount of loss contingency liability.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 450

-SubTopic 20

-Section 50

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=25496072&loc=d3e14326-108349

+ Details

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Balance Type:	credit
Period Type:	instant

X

- Details

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