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Cover Document
Jan. 02, 2026
Cover [Abstract]  
Entity Address, Address Description 8176 Park Lane
Entity Address, City or Town Dallas,
Entity Address, State or Province TX
Document Type 8-K
Document Period End Date Jan. 02, 2026
Entity Registrant Name KOSMOS ENERGY LTD.
Entity Incorporation, State or Country Code DE
Entity File Number 001-35167
Entity Tax Identification Number 98-0686001
Entity Address, Postal Zip Code 75231
Title of 12(b) Security Common Stock $0.01 par value
Trading Symbol KOS
Security Exchange Name NYSE
City Area Code 214
Local Phone Number 445 9600
Written Communications false
Soliciting Material false
Pre-commencement Tender Offer false
Pre-commencement Issuer Tender Offer false
Entity Emerging Growth Company false
Amendment Flag false
Entity Central Index Key 0001509991