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Percentage of voting equity interests acquired in the business combination.

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The pro forma basic net income per share for a period as if the business combination or combinations had been completed at the beginning of a period.

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The pro forma diluted net income per share for a period as if the business combination or combinations had been completed at the beginning of a period.

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The pro forma net Income or Loss for the period as if the business combination or combinations had been completed at the beginning of a period.

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The pro forma revenue for a period as if the business combination or combinations had been completed at the beginning of the period.

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Aggregate revenue recognized during the period (derived from goods sold, services rendered, insurance premiums, or other activities that constitute an entity's earning process). For financial services companies, also includes investment and interest income, and sales and trading gains.

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BUSINESS COMBINATION (Details) (USD $)	3 Months Ended		9 Months Ended
BUSINESS COMBINATION (Details) (USD $)	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013 US Ecology Michigan	Sep. 30, 2012 US Ecology Michigan	May 31, 2012 US Ecology Michigan
BUSINESS ACQUISITIONS
Percentage of outstanding shares acquired							100.00%
Pro forma combined:
Revenue						$ 124,233,000
Net income						19,402,000
Earnings per share - Basic (in dollars per share)						$ 1.06
Earnings per share - Diluted (in dollars per share)						$ 1.06
Additional information
Revenue	53,090,000	45,739,000	141,766,000	118,732,000	9,400,000
Operating income	$ 15,512,000	$ 12,393,000	$ 37,577,000	$ 29,824,000	$ 255,000