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Reportable Segments (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015 segment	Mar. 31, 2014
Reportable Segments
Number of business segments	4us-gaap_NumberOfReportableSegments
Revenue and other financial information by reportable segment
Revenue from external customers	$ 729,082us-gaap_SalesRevenueNet	$ 643,008us-gaap_SalesRevenueNet
Gross margin	269,012exh_GrossMargin	233,486exh_GrossMargin
North America contract operations
Revenue and other financial information by reportable segment
Revenue from external customers	202,261us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = exh_NorthAmericaContractOperationsMember	156,523us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = exh_NorthAmericaContractOperationsMember
Gross margin	119,582exh_GrossMargin / us-gaap_StatementBusinessSegmentsAxis = exh_NorthAmericaContractOperationsMember	85,442exh_GrossMargin / us-gaap_StatementBusinessSegmentsAxis = exh_NorthAmericaContractOperationsMember
International contract operations
Revenue and other financial information by reportable segment
Revenue from external customers	120,691us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = exh_InternationalContractOperationsMember	111,040us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = exh_InternationalContractOperationsMember
Gross margin	76,352exh_GrossMargin / us-gaap_StatementBusinessSegmentsAxis = exh_InternationalContractOperationsMember	70,008exh_GrossMargin / us-gaap_StatementBusinessSegmentsAxis = exh_InternationalContractOperationsMember
Aftermarket services
Revenue and other financial information by reportable segment
Revenue from external customers	86,856us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = exh_AftermarketServicesMember	88,048us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = exh_AftermarketServicesMember
Gross margin	20,922exh_GrossMargin / us-gaap_StatementBusinessSegmentsAxis = exh_AftermarketServicesMember	20,227exh_GrossMargin / us-gaap_StatementBusinessSegmentsAxis = exh_AftermarketServicesMember
Fabrication
Revenue and other financial information by reportable segment
Revenue from external customers	319,274us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = exh_FabricationMember	287,397us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = exh_FabricationMember
Gross margin	$ 52,156exh_GrossMargin / us-gaap_StatementBusinessSegmentsAxis = exh_FabricationMember	$ 57,809exh_GrossMargin / us-gaap_StatementBusinessSegmentsAxis = exh_FabricationMember

X

- Definition

Aggregate revenue less cost of goods and services sold or operating expenses directly attributable to the revenue generation activity, excluding depreciation and amortization expense. Gross margin is a non-GAAP financial measure.

+ References

No definition available.

+ Details

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X

- Definition

Number of segments reported by the entity. A reportable segment is a component of an entity for which there is an accounting requirement to report separate financial information on that component in the entity's financial statements.

+ References

No definition available.

+ Details

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X

- Definition

Total revenue from sale of goods and services rendered during the reporting period, in the normal course of business, reduced by sales returns and allowances, and sales discounts.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 225

-SubTopic 10

-Section S99

-Paragraph 2

-Subparagraph (SX 210.5-03.1)

-URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 1

-Article 5

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