| Cover | Jun. 29, 2021 |
| Affiliate, Collateralized Security [Line Items] | |
| Document Type | 8-K |
| Amendment Flag | false |
| Document Period End Date | Jun. 29, 2021 |
| 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 | |
| Affiliate, Collateralized Security [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 | |
| Affiliate, Collateralized Security [Line Items] | |
| Title of 12(b) Security | Warrants to Purchase Common Stock |
| Trading Symbol | ECOLW |
| Security Exchange Name | NASDAQ |
