| Cover | Feb. 23, 2023 |
| Cover [Abstract] | |
| Document Type | 8-K |
| Document Period End Date | Jan. 09, 2024 |
| Entity Registrant Name | LANTHEUS HOLDINGS, INC. |
| Entity Incorporation, State or Country Code | DE |
| Entity File Number | 001-36569 |
| Entity Tax Identification Number | 35-2318913 |
| Entity Address, Address Line One | 201 Burlington Road, South Building |
| Entity Address, City or Town | Bedford |
| Entity Address, State or Province | MA |
| Entity Address, Postal Zip Code | 01730 |
| City Area Code | 978 |
| Local Phone Number | 671-8001 |
| Written Communications | false |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
| Title of 12(b) Security | Common stock, par value $0.01 per share |
| Trading Symbol | LNTH |
| Security Exchange Name | NASDAQ |
| Entity Emerging Growth Company | false |
| Amendment Flag | false |
| Entity Central Index Key | 0001521036 |
