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INVESTMENTS IN NON-CONSOLIDATED AFFILIATES (Details) (USD $) In Millions, unless otherwise specified	1 Months Ended	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2009 jointventure
INVESTMENTS IN NON-CONSOLIDATED AFFILIATES
Number of joint ventures		2
Impairment charge		$ 90.1
Impairment charge, net of tax		81.7
Proceeds from the sale of the joint venture	37.6
Expected proceeds from the sale of the joint ventures	$ 74.8

X

- Definition

This item represents the amount of additional net sales proceeds expected to be received on disposal of an equity method investment

+ References

No definition available.

+ Details

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Namespace Prefix:	exh_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Amount represents an other than temporary impairment of an equity method investment net of the associated tax impact.

+ References

No definition available.

+ Details

Name:	exh_EquityMethodInvestmentOtherThanTemporaryImpairmentNetOfTax
Namespace Prefix:	exh_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Represents the number of joint ventures.

+ References

No definition available.

+ Details

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Namespace Prefix:	exh_
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X

- Definition

This item represents the amount of net sales proceeds received on disposal of an equity method investment.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 323

-SubTopic 10

-Section 35

-Paragraph 35

-URI http://asc.fasb.org/extlink&oid=6903645&loc=d3e32847-111569

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Namespace Prefix:	us-gaap_
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- Definition

This item represents an other than temporary decline in value that has been recognized against an investment accounted for under the equity method of accounting. The excess of the carrying amount over the fair value of the investment represents the amount of the write down which is or was reflected in earnings. The written down value is a new cost basis with the adjusted value of the investment becoming its new carrying value subject to the equity accounting method. Evidence of a loss in value might include, but would not necessarily be limited to, absence of an ability to recover the carrying amount of the investment or inability of the investee to sustain an earnings capacity which would justify the carrying amount of the investment.

+ References

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

-Publisher AICPA

-Name Accounting Principles Board Opinion (APB)

-Number 18

-Paragraph 19

-Subparagraph h

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.



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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 323

-SubTopic 10

-Section 35

-Paragraph 32

-URI http://asc.fasb.org/extlink&oid=6903645&loc=d3e32787-111569

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