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Fabrication Contracts (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013
Costs, estimated earnings and billings on uncompleted contracts |  |
Costs incurred on uncompleted contracts | $ 811,977 exh_CostsIncurredOnUncompletedContracts | $ 713,889 exh_CostsIncurredOnUncompletedContracts
Estimated earnings | 134,569 exh_EstimatedEarningsOnUncompletedContracts | 109,494 exh_EstimatedEarningsOnUncompletedContracts
Total cost incurred and estimated earnings on uncompleted contracts | 946,546 exh_CostIncurredAndEstimatedEarningsOnUncompletedContracts | 823,383 exh_CostIncurredAndEstimatedEarningsOnUncompletedContracts
Less - billings to date | (901,885)exh_BillingsToDateOnUncompletedContracts | (794,133)exh_BillingsToDateOnUncompletedContracts
Total cost and estimated earnings versus billings | $ 44,661 exh_CostsAndEstimatedEarningsOnUncompletedContractsNet | $ 29,250 exh_CostsAndEstimatedEarningsOnUncompletedContractsNet

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- Definition Represents billing to date incurred on uncompleted contracts. + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Represents costs incurred and estimated earnings on uncompleted contracts. + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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- Definition Represents costs incurred and estimated earnings on uncompleted contracts after billings. + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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- Definition Represents costs incurred on uncompleted contracts. + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Represents estimated earnings on uncompleted contracts. + References No definition available. + Details
Name: | exh_EstimatedEarningsOnUncompletedContracts
Namespace Prefix: | exh_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Details
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