XML 16 R54.htm IDEA: XBRL DOCUMENT
v2.4.0.6

Background and Significant Accounting Policies (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2012 item | Dec. 31, 2011 | Dec. 31, 2010
Principles of Consolidation |  |  |
Number of primary business lines | 3 |  |
Concentrations of Credit Risk |  |  |
Minimum period after receivable balances are past due that significant accounts are reviewed individually for collectibility | 90 days |  |
Bad debt expenses | $ 8,754 | $ 1,488 | $ 4,749
Minimum |  |  |
Revenue Recognition |  |  |
Duration of fabrication projects | 3 months |  |
Maximum |  |  |
Revenue Recognition |  |  |
Duration of fabrication projects | 36 months |  |

X
- Details
Name: | exh_ConcentrationsOfCreditRiskAbstract
Namespace Prefix: | exh_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Duration of fabrication projects. + References No definition available. + Details
Name: | exh_DurationOfFabricationProjects
Namespace Prefix: | exh_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Number of primary business lines reported by the entity. + References No definition available. + Details
Name: | exh_NumberOfPrimaryBusinessLines
Namespace Prefix: | exh_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Minimum period after receivable balances are past due that significant accounts are reviewed individually for collectibility. + References No definition available. + Details
Name: | exh_PeriodForEvaluatingCreditRisk
Namespace Prefix: | exh_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | exh_PrinciplesOfConsolidationAbstract
Namespace Prefix: | exh_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | exh_SummaryOfSignificantAccountingPoliciesLineItems
Namespace Prefix: | exh_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of the current period expense charged against operations, the offset which is generally to the allowance for doubtful accounts for the purpose of reducing receivables, including notes receivable, to an amount that approximates their net realizable value (the amount expected to be collected). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 5 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 28 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3602-108585 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.5) -URI http://asc.fasb.org/extlink&oid=6880815&loc=d3e20235-122688 + Details
Name: | us-gaap_ProvisionForDoubtfulAccounts
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration