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