XML 41 R55.htm IDEA: XBRL DOCUMENT v2.4.0.8

Commitments and Contingencies (Details 2) (USD $) In Millions, unless otherwise specified	2 Months Ended	9 Months Ended	21 Months Ended
	Sep. 30, 2013 case	Sep. 30, 2013	Sep. 30, 2013
Ad valorem tax
Number of heavy equipment statutes cases tried and completed to which the entity is a party	1
Number of heavy equipment statutes cases tried and completed in Texas state district court	2
Ad valorem tax benefit		$ 6.0	$ 12.8
Ad valorem tax benefit agreed to by a number of appraisal review boards and county appraisal districts	3.3	3.3	3.3
Ad valorem tax benefit in litigation	9.5	9.5	9.5
Maximum
Business acquisition, contingent consideration
Contingent payments	$ 46	$ 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

Name:	exh_AdValoremTaxExpenseBenefit
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

Name:	exh_AdValoremTaxExpenseBenefitInLitigation
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.

+ References

No definition available.

+ Details

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

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

- Details

Name:	exh_OtherTaxAbstract
Namespace Prefix:	exh_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	us-gaap_BusinessAcquisitionContingentConsiderationLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
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

Name:	us-gaap_BusinessCombinationContingentConsiderationArrangementsRangeOfOutcomesValueHigh
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant