CLOSURE AND POST-CLOSURE LIABILITIES (Anticipated Payments) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Environmental Property Sale, Disposal or Abandonment Costs
2015	$ 5,858
2016	13,622
2017	6,453
2018	4,962
2019	7,455
Thereafter	257,983
Undiscounted closure and post-closure liabilities	296,333
Less: Discount at credit-adjusted risk-free rate	(153,553)clh_DiscountReserves
Less: Undiscounted estimated closure and post-closure liabilities relating to airspace not yet consumed	(92,079)
Present value of closure and post-closure liabilities	$ 50,701us-gaap_AssetRetirementObligation	$ 47,085us-gaap_AssetRetirementObligation	$ 44,047us-gaap_AssetRetirementObligation

Anticipated Payment for Asset Retirement Obligations, After Year Five

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- Definition

Anticipated Payment for Asset Retirement Obligations year Five

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Anticipated Payment for Asset Retirement Obligations year Four

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Anticipated Payment for Asset Retirement Obligations year One

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Anticipated Payment for Asset Retirement Obligations year Three

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Anticipated Payment for Asset Retirement Obligations year Two

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Discount Reserves

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- Definition

Reserves to be Provided Over Remaining Site Lives

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- Definition

Undiscounted Closure and Post-Closure Liabilities

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- Definition

The carrying amount of a liability for an asset retirement obligation. An asset retirement obligation is a legal obligation associated with the disposal or retirement of a tangible long-lived asset that results from the acquisition, construction or development, or the normal operations of a long-lived asset, except for certain obligations of lessees.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 410

-SubTopic 20

-Section 50

-Paragraph 1

-Subparagraph (c)

-URI http://asc.fasb.org/extlink&oid=6392692&loc=d3e7535-110849

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

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Asset Retirement Obligation

-URI http://asc.fasb.org/extlink&oid=6505190

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