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Discontinued Operations (Details) (USD $)	1 Months Ended	3 Months Ended
	Aug. 31, 2012	Mar. 31, 2015	Mar. 31, 2014	Dec. 31, 2014
Summary of operating results of the discontinued operations
Expenses and selling, general and administrative		$ 156,000exh_DisposalGroupIncludingDiscontinuedOperationExpensesAndSellingGeneralAndAdministrative	$ 197,000exh_DisposalGroupIncludingDiscontinuedOperationExpensesAndSellingGeneralAndAdministrative
Recovery attributable to expropriation and impairments		(16,506,000)exh_DisposalGroupIncludingDiscontinuedOperationLossRecoveryAttributableToExpropriationImpairmentsAndInventoryWriteDowns	(16,421,000)exh_DisposalGroupIncludingDiscontinuedOperationLossRecoveryAttributableToExpropriationImpairmentsAndInventoryWriteDowns
Other (income) loss, net		(2,321,000)us-gaap_DiscontinuedOperationAmountOfOtherIncomeLossFromDispositionOfDiscontinuedOperationsBeforeIncomeTax	(2,533,000)us-gaap_DiscontinuedOperationAmountOfOtherIncomeLossFromDispositionOfDiscontinuedOperationsBeforeIncomeTax
Provision for (benefit from) income taxes		(42,000)us-gaap_DiscontinuedOperationTaxEffectOfDiscontinuedOperation	30,000us-gaap_DiscontinuedOperationTaxEffectOfDiscontinuedOperation
Income (loss) from discontinued operations, net of tax		18,713,000us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax	18,727,000us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax
Summary of balance sheet data for discontinued operations
Cash		408,000us-gaap_DisposalGroupIncludingDiscontinuedOperationCashAndCashEquivalents		431,000us-gaap_DisposalGroupIncludingDiscontinuedOperationCashAndCashEquivalents
Accounts receivable		2,000us-gaap_TradeReceivablesHeldForSaleNet		71,000us-gaap_TradeReceivablesHeldForSaleNet
Other current assets		43,000us-gaap_DisposalGroupIncludingDiscontinuedOperationOtherCurrentAssets		35,000us-gaap_DisposalGroupIncludingDiscontinuedOperationOtherCurrentAssets
Total current assets associated with discontinued operations		453,000us-gaap_AssetsOfDisposalGroupIncludingDiscontinuedOperationCurrent		537,000us-gaap_AssetsOfDisposalGroupIncludingDiscontinuedOperationCurrent
Deferred tax assets				17,469,000us-gaap_DisposalGroupIncludingDiscontinuedOperationDeferredTaxAssetsNoncurrent
Total assets associated with discontinued operations		453,000us-gaap_AssetsOfDisposalGroupIncludingDiscontinuedOperation		18,006,000us-gaap_AssetsOfDisposalGroupIncludingDiscontinuedOperation
Accounts payable		2,000us-gaap_DisposalGroupIncludingDiscontinuedOperationAccountsPayable		215,000us-gaap_DisposalGroupIncludingDiscontinuedOperationAccountsPayable
Accrued liabilities		1,769,000us-gaap_DisposalGroupIncludingDiscontinuedOperationAccruedLiabilities		1,851,000us-gaap_DisposalGroupIncludingDiscontinuedOperationAccruedLiabilities
Total current liabilities associated with discontinued operations		1,771,000us-gaap_LiabilitiesOfDisposalGroupIncludingDiscontinuedOperationCurrent		2,066,000us-gaap_LiabilitiesOfDisposalGroupIncludingDiscontinuedOperationCurrent
Other long-term liabilities		340,000us-gaap_DisposalGroupIncludingDiscontinuedOperationOtherNoncurrentLiabilities		317,000us-gaap_DisposalGroupIncludingDiscontinuedOperationOtherNoncurrentLiabilities
Total liabilities associated with discontinued operations		2,111,000us-gaap_LiabilitiesOfDisposalGroupIncludingDiscontinuedOperation		2,383,000us-gaap_LiabilitiesOfDisposalGroupIncludingDiscontinuedOperation
Venezuela
Discontinued Operations
Sale price of expropriated assets	441,700,000exh_SalePriceOfExpropriatedAssets / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = exh_VenezuelaOperationsMember
Installment payments, including an annual charge, received from sale of expropriated assets		18,700,000exh_ProceedsFromSaleOfExpropriatedAssetsInstallmentPayment / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = exh_VenezuelaOperationsMember	17,800,000exh_ProceedsFromSaleOfExpropriatedAssetsInstallmentPayment / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = exh_VenezuelaOperationsMember
Remaining expected proceeds from sale of expropriated assets		99,000,000exh_ExpectedProceedsFromSaleOfExpropriatedAssets / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = exh_VenezuelaOperationsMember
Summary of operating results of the discontinued operations
Expenses and selling, general and administrative		84,000exh_DisposalGroupIncludingDiscontinuedOperationExpensesAndSellingGeneralAndAdministrative / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = exh_VenezuelaOperationsMember	124,000exh_DisposalGroupIncludingDiscontinuedOperationExpensesAndSellingGeneralAndAdministrative / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = exh_VenezuelaOperationsMember
Recovery attributable to expropriation and impairments		(16,506,000)exh_DisposalGroupIncludingDiscontinuedOperationLossRecoveryAttributableToExpropriationImpairmentsAndInventoryWriteDowns / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = exh_VenezuelaOperationsMember	(16,421,000)exh_DisposalGroupIncludingDiscontinuedOperationLossRecoveryAttributableToExpropriationImpairmentsAndInventoryWriteDowns / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = exh_VenezuelaOperationsMember
Other (income) loss, net		(2,321,000)us-gaap_DiscontinuedOperationAmountOfOtherIncomeLossFromDispositionOfDiscontinuedOperationsBeforeIncomeTax / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = exh_VenezuelaOperationsMember	(2,386,000)us-gaap_DiscontinuedOperationAmountOfOtherIncomeLossFromDispositionOfDiscontinuedOperationsBeforeIncomeTax / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = exh_VenezuelaOperationsMember
Income (loss) from discontinued operations, net of tax		18,743,000us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = exh_VenezuelaOperationsMember	18,683,000us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = exh_VenezuelaOperationsMember
Summary of balance sheet data for discontinued operations
Cash		408,000us-gaap_DisposalGroupIncludingDiscontinuedOperationCashAndCashEquivalents / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = exh_VenezuelaOperationsMember		431,000us-gaap_DisposalGroupIncludingDiscontinuedOperationCashAndCashEquivalents / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = exh_VenezuelaOperationsMember
Accounts receivable		2,000us-gaap_TradeReceivablesHeldForSaleNet / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = exh_VenezuelaOperationsMember		2,000us-gaap_TradeReceivablesHeldForSaleNet / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = exh_VenezuelaOperationsMember
Other current assets		43,000us-gaap_DisposalGroupIncludingDiscontinuedOperationOtherCurrentAssets / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = exh_VenezuelaOperationsMember		35,000us-gaap_DisposalGroupIncludingDiscontinuedOperationOtherCurrentAssets / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = exh_VenezuelaOperationsMember
Total current assets associated with discontinued operations		453,000us-gaap_AssetsOfDisposalGroupIncludingDiscontinuedOperationCurrent / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = exh_VenezuelaOperationsMember		468,000us-gaap_AssetsOfDisposalGroupIncludingDiscontinuedOperationCurrent / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = exh_VenezuelaOperationsMember
Total assets associated with discontinued operations		453,000us-gaap_AssetsOfDisposalGroupIncludingDiscontinuedOperation / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = exh_VenezuelaOperationsMember		468,000us-gaap_AssetsOfDisposalGroupIncludingDiscontinuedOperation / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = exh_VenezuelaOperationsMember
Accounts payable				214,000us-gaap_DisposalGroupIncludingDiscontinuedOperationAccountsPayable / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = exh_VenezuelaOperationsMember
Accrued liabilities		1,114,000us-gaap_DisposalGroupIncludingDiscontinuedOperationAccruedLiabilities / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = exh_VenezuelaOperationsMember		1,124,000us-gaap_DisposalGroupIncludingDiscontinuedOperationAccruedLiabilities / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = exh_VenezuelaOperationsMember
Total current liabilities associated with discontinued operations		1,114,000us-gaap_LiabilitiesOfDisposalGroupIncludingDiscontinuedOperationCurrent / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = exh_VenezuelaOperationsMember		1,338,000us-gaap_LiabilitiesOfDisposalGroupIncludingDiscontinuedOperationCurrent / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = exh_VenezuelaOperationsMember
Other long-term liabilities		340,000us-gaap_DisposalGroupIncludingDiscontinuedOperationOtherNoncurrentLiabilities / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = exh_VenezuelaOperationsMember		317,000us-gaap_DisposalGroupIncludingDiscontinuedOperationOtherNoncurrentLiabilities / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = exh_VenezuelaOperationsMember
Total liabilities associated with discontinued operations		1,454,000us-gaap_LiabilitiesOfDisposalGroupIncludingDiscontinuedOperation / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = exh_VenezuelaOperationsMember		1,655,000us-gaap_LiabilitiesOfDisposalGroupIncludingDiscontinuedOperation / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = exh_VenezuelaOperationsMember
Contract Water Treatment Business
Summary of operating results of the discontinued operations
Expenses and selling, general and administrative		72,000exh_DisposalGroupIncludingDiscontinuedOperationExpensesAndSellingGeneralAndAdministrative / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = exh_ContractWaterTreatmentBusinessMember	73,000exh_DisposalGroupIncludingDiscontinuedOperationExpensesAndSellingGeneralAndAdministrative / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = exh_ContractWaterTreatmentBusinessMember
Other (income) loss, net			(147,000)us-gaap_DiscontinuedOperationAmountOfOtherIncomeLossFromDispositionOfDiscontinuedOperationsBeforeIncomeTax / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = exh_ContractWaterTreatmentBusinessMember
Provision for (benefit from) income taxes		(42,000)us-gaap_DiscontinuedOperationTaxEffectOfDiscontinuedOperation / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = exh_ContractWaterTreatmentBusinessMember	30,000us-gaap_DiscontinuedOperationTaxEffectOfDiscontinuedOperation / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = exh_ContractWaterTreatmentBusinessMember
Income (loss) from discontinued operations, net of tax		(30,000)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = exh_ContractWaterTreatmentBusinessMember	44,000us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = exh_ContractWaterTreatmentBusinessMember
Summary of balance sheet data for discontinued operations
Accounts receivable				69,000us-gaap_TradeReceivablesHeldForSaleNet / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = exh_ContractWaterTreatmentBusinessMember
Total current assets associated with discontinued operations				69,000us-gaap_AssetsOfDisposalGroupIncludingDiscontinuedOperationCurrent / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = exh_ContractWaterTreatmentBusinessMember
Deferred tax assets				17,469,000us-gaap_DisposalGroupIncludingDiscontinuedOperationDeferredTaxAssetsNoncurrent / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = exh_ContractWaterTreatmentBusinessMember
Total assets associated with discontinued operations				17,538,000us-gaap_AssetsOfDisposalGroupIncludingDiscontinuedOperation / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = exh_ContractWaterTreatmentBusinessMember
Accounts payable		2,000us-gaap_DisposalGroupIncludingDiscontinuedOperationAccountsPayable / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = exh_ContractWaterTreatmentBusinessMember		1,000us-gaap_DisposalGroupIncludingDiscontinuedOperationAccountsPayable / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = exh_ContractWaterTreatmentBusinessMember
Accrued liabilities		655,000us-gaap_DisposalGroupIncludingDiscontinuedOperationAccruedLiabilities / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = exh_ContractWaterTreatmentBusinessMember		727,000us-gaap_DisposalGroupIncludingDiscontinuedOperationAccruedLiabilities / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = exh_ContractWaterTreatmentBusinessMember
Total current liabilities associated with discontinued operations		657,000us-gaap_LiabilitiesOfDisposalGroupIncludingDiscontinuedOperationCurrent / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = exh_ContractWaterTreatmentBusinessMember		728,000us-gaap_LiabilitiesOfDisposalGroupIncludingDiscontinuedOperationCurrent / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = exh_ContractWaterTreatmentBusinessMember
Total liabilities associated with discontinued operations		$ 657,000us-gaap_LiabilitiesOfDisposalGroupIncludingDiscontinuedOperation / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = exh_ContractWaterTreatmentBusinessMember		$ 728,000us-gaap_LiabilitiesOfDisposalGroupIncludingDiscontinuedOperation / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = exh_ContractWaterTreatmentBusinessMember

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Amount of expense including selling, general and administrative expenses attributable to the disposal group, including a component of the entity (discontinued operation) during the reporting period.

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Tax effect allocated to a disposal group that is classified as a component of the entity reported as a separate component of income before extraordinary items. Includes the tax effects of the following: income (loss) from operations during the phase-out period, gain (loss) on disposal, provision (or any reversals of earlier provisions) for loss on disposal, and adjustments of a prior period gain (loss) on disposal.

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Amount classified as cash and cash equivalents attributable to disposal group held for sale or disposed of.

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Amount classified as deferred tax assets attributable to disposal group held for sale or disposed of, expected to be disposed of after one year or the normal operating cycle, if longer.

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Amount classified as other assets attributable to disposal group held for sale or disposed of, expected to be disposed of within one year or the normal operating cycle, if longer.

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Amount classified as other liabilities attributable to disposal group held for sale or disposed of, expected to be disposed of beyond one year or the normal operating cycle, if longer.

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Amount of income (loss) from a disposal group, net of income tax before extraordinary items allocable to noncontrolling interests. Includes, net of tax, income (loss) from operations during the phase-out period, gain (loss) on disposal, provision (or any reversals of earlier provisions) for loss on disposal, and adjustments of a prior period gain (loss) on disposal.

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