v3.26.1
Document and Entity Information
Aug. 14, 2026
Cover [Abstract]  
Entity Registrant Name MARTIN MARIETTA MATERIALS INC
Amendment Flag false
Entity Central Index Key 0000916076
Document Type 8-K
Document Period End Date Aug. 14, 2026
Entity Incorporation State Country Code NC
Entity File Number 001-12744
Entity Tax Identification Number 56-1848578
Entity Address, Address Line One 4123 Parklake Avenue
Entity Address, City or Town Raleigh
Entity Address, State or Province NC
Entity Address, Postal Zip Code 27612
City Area Code 919
Local Phone Number 781-4550
Written Communications false
Soliciting Material false
Pre Commencement Tender Offer false
Pre Commencement Issuer Tender Offer false
Security 12b Title Common Stock, $0.01 par value per share
Trading Symbol MLM
Security Exchange Name NYSE
Entity Emerging Growth Company false