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Selected Quarterly Financial Data (Details) (USD $)	1 Months Ended	3 Months Ended								12 Months Ended			3 Months Ended
	Jan. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2012
Summarized quarterly financial data
Revenue from external customers		$ 793,628,000us-gaap_SalesRevenueNet	$ 723,832,000us-gaap_SalesRevenueNet	$ 739,270,000us-gaap_SalesRevenueNet	$ 643,008,000us-gaap_SalesRevenueNet	$ 739,018,000us-gaap_SalesRevenueNet	$ 775,584,000us-gaap_SalesRevenueNet	$ 835,906,000us-gaap_SalesRevenueNet	$ 809,896,000us-gaap_SalesRevenueNet	$ 2,899,738,000us-gaap_SalesRevenueNet	$ 3,160,404,000us-gaap_SalesRevenueNet	$ 2,794,246,000us-gaap_SalesRevenueNet
Gross profit		175,708,000us-gaap_GrossProfit	165,593,000us-gaap_GrossProfit	143,390,000us-gaap_GrossProfit	152,060,000us-gaap_GrossProfit	159,092,000us-gaap_GrossProfit	167,049,000us-gaap_GrossProfit	166,145,000us-gaap_GrossProfit	145,808,000us-gaap_GrossProfit
Net income attributable to Exterran stockholders		19,143,000us-gaap_NetIncomeLoss	34,050,000us-gaap_NetIncomeLoss	12,377,000us-gaap_NetIncomeLoss	32,596,000us-gaap_NetIncomeLoss	22,647,000us-gaap_NetIncomeLoss	40,977,000us-gaap_NetIncomeLoss	9,335,000us-gaap_NetIncomeLoss	50,205,000us-gaap_NetIncomeLoss	98,166,000us-gaap_NetIncomeLoss	123,164,000us-gaap_NetIncomeLoss	(39,486,000)us-gaap_NetIncomeLoss
Net income attributable to Exterran common stockholders per share:
Basic (in dollars per share)		$ 0.28us-gaap_EarningsPerShareBasic	$ 0.51us-gaap_EarningsPerShareBasic	$ 0.19us-gaap_EarningsPerShareBasic	$ 0.49us-gaap_EarningsPerShareBasic	$ 0.34us-gaap_EarningsPerShareBasic	$ 0.62us-gaap_EarningsPerShareBasic	$ 0.14us-gaap_EarningsPerShareBasic	$ 0.77us-gaap_EarningsPerShareBasic	$ 1.46us-gaap_EarningsPerShareBasic	$ 1.88us-gaap_EarningsPerShareBasic	$ (0.62)us-gaap_EarningsPerShareBasic
Diluted (in dollars per share)		$ 0.27us-gaap_EarningsPerShareDiluted	$ 0.48us-gaap_EarningsPerShareDiluted	$ 0.19us-gaap_EarningsPerShareDiluted	$ 0.47us-gaap_EarningsPerShareDiluted	$ 0.34us-gaap_EarningsPerShareDiluted	$ 0.62us-gaap_EarningsPerShareDiluted	$ 0.14us-gaap_EarningsPerShareDiluted	$ 0.76us-gaap_EarningsPerShareDiluted	$ 1.40us-gaap_EarningsPerShareDiluted	$ 1.86us-gaap_EarningsPerShareDiluted	$ (0.62)us-gaap_EarningsPerShareDiluted
Selected Quarterly Financial Information
Equity in income of non-consolidated affiliates	5,000,000exh_EquityMethodInvestmentSalesProceedsInstallmentPayment		5,000,000exh_EquityMethodInvestmentSalesProceedsInstallmentPayment	4,900,000exh_EquityMethodInvestmentSalesProceedsInstallmentPayment	4,900,000exh_EquityMethodInvestmentSalesProceedsInstallmentPayment	4,800,000exh_EquityMethodInvestmentSalesProceedsInstallmentPayment	4,800,000exh_EquityMethodInvestmentSalesProceedsInstallmentPayment	4,700,000exh_EquityMethodInvestmentSalesProceedsInstallmentPayment	4,700,000exh_EquityMethodInvestmentSalesProceedsInstallmentPayment	14,700,000exh_EquityMethodInvestmentSalesProceedsInstallmentPayment	19,000,000exh_EquityMethodInvestmentSalesProceedsInstallmentPayment	14,100,000exh_EquityMethodInvestmentSalesProceedsInstallmentPayment
Restructuring charges		2,200,000us-gaap_RestructuringAndRelatedCostIncurredCost			4,800,000us-gaap_RestructuringAndRelatedCostIncurredCost					7,553,000us-gaap_RestructuringAndRelatedCostIncurredCost		6,471,000us-gaap_RestructuringAndRelatedCostIncurredCost
Long-lived asset impairment		20,700,000us-gaap_AssetImpairmentCharges	12,400,000us-gaap_AssetImpairmentCharges	9,800,000us-gaap_AssetImpairmentCharges	3,800,000us-gaap_AssetImpairmentCharges	3,900,000us-gaap_AssetImpairmentCharges	4,500,000us-gaap_AssetImpairmentCharges	16,600,000us-gaap_AssetImpairmentCharges	3,600,000us-gaap_AssetImpairmentCharges	46,679,000us-gaap_AssetImpairmentCharges	28,637,000us-gaap_AssetImpairmentCharges	136,614,000us-gaap_AssetImpairmentCharges
Venezuela
Selected Quarterly Financial Information
Net proceeds from sale of previously nationalized assets		18,500,000exh_ProceedsFromSaleOfExpropriatedAssetsInstallmentPayment / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = exh_VenezuelaOperationsMember	18,200,000exh_ProceedsFromSaleOfExpropriatedAssetsInstallmentPayment / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = exh_VenezuelaOperationsMember	18,100,000exh_ProceedsFromSaleOfExpropriatedAssetsInstallmentPayment / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = exh_VenezuelaOperationsMember	17,800,000exh_ProceedsFromSaleOfExpropriatedAssetsInstallmentPayment / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = exh_VenezuelaOperationsMember	17,600,000exh_ProceedsFromSaleOfExpropriatedAssetsInstallmentPayment / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = exh_VenezuelaOperationsMember	17,400,000exh_ProceedsFromSaleOfExpropriatedAssetsInstallmentPayment / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = exh_VenezuelaOperationsMember		34,300,000exh_ProceedsFromSaleOfExpropriatedAssetsInstallmentPayment / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = exh_VenezuelaOperationsMember	72,600,000exh_ProceedsFromSaleOfExpropriatedAssetsInstallmentPayment / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = exh_VenezuelaOperationsMember	69,300,000exh_ProceedsFromSaleOfExpropriatedAssetsInstallmentPayment / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = exh_VenezuelaOperationsMember	16,800,000exh_ProceedsFromSaleOfExpropriatedAssetsInstallmentPayment / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = exh_VenezuelaOperationsMember
Prepayment of second quarter installment payment received									17,200,000exh_ProceedsFromSaleOfExpropriatedAssetsPrepaymentOfInstallmentPayment / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = exh_VenezuelaOperationsMember
Canada
Selected Quarterly Financial Information
Impairment of discontinued operations								3,900,000exh_DisposalGroupIncludingDiscontinuedOperationAssetImpairmentCharges / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = exh_CanadaOperationsMember	2,100,000exh_DisposalGroupIncludingDiscontinuedOperationAssetImpairmentCharges / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = exh_CanadaOperationsMember		6,400,000exh_DisposalGroupIncludingDiscontinuedOperationAssetImpairmentCharges / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = exh_CanadaOperationsMember	80,200,000exh_DisposalGroupIncludingDiscontinuedOperationAssetImpairmentCharges / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = exh_CanadaOperationsMember
Contract Water Treatment Business
Selected Quarterly Financial Information
Impairment of discontinued operations							2,400,000exh_DisposalGroupIncludingDiscontinuedOperationAssetImpairmentCharges / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = exh_ContractWaterTreatmentBusinessMember				2,400,000exh_DisposalGroupIncludingDiscontinuedOperationAssetImpairmentCharges / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = exh_ContractWaterTreatmentBusinessMember	46,800,000exh_DisposalGroupIncludingDiscontinuedOperationAssetImpairmentCharges / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = exh_ContractWaterTreatmentBusinessMember	46,800,000exh_DisposalGroupIncludingDiscontinuedOperationAssetImpairmentCharges / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = exh_ContractWaterTreatmentBusinessMember
Fabrication
Summarized quarterly financial data
Revenue from external customers										1,284,008,000us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = exh_FabricationMember	1,660,944,000us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = exh_FabricationMember	1,348,417,000us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = exh_FabricationMember
Selected Quarterly Financial Information
Long-lived asset impairment								$ 11,900,000us-gaap_ImpairmentOfLongLivedAssetsToBeDisposedOf / us-gaap_StatementBusinessSegmentsAxis = exh_FabricationMember			$ 11,900,000us-gaap_ImpairmentOfLongLivedAssetsToBeDisposedOf / us-gaap_StatementBusinessSegmentsAxis = exh_FabricationMember

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