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Investments in Non-Consolidated Affiliates (Details) (USD $) In Millions, unless otherwise specified	1 Months Ended		3 Months Ended							12 Months Ended
	Jan. 31, 2015	Mar. 31, 2012	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
Investments in Non-Consolidated Affiliates
Initial payment received from the sale of the joint venture		$ 37.6exh_EquityMethodInvestmentSalesProceedsInitialPayment
Installment payments, including annual charges, received from the sale of the joint venture	5.0exh_EquityMethodInvestmentSalesProceedsInstallmentPayment		5.0exh_EquityMethodInvestmentSalesProceedsInstallmentPayment	4.9exh_EquityMethodInvestmentSalesProceedsInstallmentPayment	4.9exh_EquityMethodInvestmentSalesProceedsInstallmentPayment	4.8exh_EquityMethodInvestmentSalesProceedsInstallmentPayment	4.8exh_EquityMethodInvestmentSalesProceedsInstallmentPayment	4.7exh_EquityMethodInvestmentSalesProceedsInstallmentPayment	4.7exh_EquityMethodInvestmentSalesProceedsInstallmentPayment	14.7exh_EquityMethodInvestmentSalesProceedsInstallmentPayment	19.0exh_EquityMethodInvestmentSalesProceedsInstallmentPayment	14.1exh_EquityMethodInvestmentSalesProceedsInstallmentPayment
Remaining principal amount due from sale of joint venture										$ 26exh_EquityMethodInvestmentExpectedNetSalesProceeds
PIGAP II
Ownership interest of each equity method investee
Ownership Interest (as a percent)										30.00%us-gaap_EquityMethodInvestmentOwnershipPercentage / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = exh_PIGPIIMember
El Furrial
Ownership interest of each equity method investee
Ownership Interest (as a percent)										33.30%us-gaap_EquityMethodInvestmentOwnershipPercentage / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = exh_ElFurrialMember

X

- Definition

The additional cash inflows expected to be received on disposal of an equity method investment.

+ References

No definition available.

+ Details

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- Definition

The cash inflows from initial proceeds received on disposal of an equity method investment.

+ References

No definition available.

+ Details

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- Definition

The cash inflows from installment payments received during the period on disposal of an equity method investment.

+ References

No definition available.

+ Details

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X

- Definition

The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 323

-SubTopic 10

-Section 50

-Paragraph 3

-Subparagraph (a)(1)

-URI http://asc.fasb.org/extlink&oid=6382943&loc=d3e33918-111571

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