| Cover | Aug. 06, 2020 | May 07, 2020 |
| Schedule of Capitalization, Equity [Line Items] | ||
| Document Type | 8-K | |
| Amendment Flag | false | |
| Document Period End Date | Aug. 6, 2020 | |
| Entity File Number | 001-39120 | |
| Entity Registrant Name | US ECOLOGY, INC. | |
| Entity Central Index Key | 0001783400 | |
| Entity Tax Identification Number | 84-2421185 | |
| Entity Incorporation, State or Country Code | DE | |
| Entity Address, Address Line One | 101 S. Capitol Blvd. | |
| Entity Address, Address Line Two | Suite 1000 | |
| Entity Address, City or Town | Boise | |
| Entity Address, State or Province | ID | |
| Entity Address, Postal Zip Code | 83702 | |
| City Area Code | (208) | |
| Local Phone Number | 331-8400 | |
| Written Communications | false | |
| Soliciting Material | false | |
| Pre-commencement Tender Offer | false | |
| Pre-commencement Issuer Tender Offer | false | |
| Entity Emerging Growth Company | false | |
| Common Stock, $0.01 par value | ||
| Schedule of Capitalization, Equity [Line Items] | ||
| Title of 12(b) Security | Common Stock, $0.01 par value | |
| Trading Symbol | ECOL | |
| Security Exchange Name | NASDAQ | |
| Warrants to Purchase Common Stock | ||
| Schedule of Capitalization, Equity [Line Items] | ||
| Title of 12(b) Security | Warrants to Purchase Common Stock | |
| Trading Symbol | ECOLW | |
| Security Exchange Name | NASDAQ |
