XML 36 R1.htm IDEA: XBRL DOCUMENT v3.20.4
Document and Entity Information - USD ($)
 12 Months Ended
Dec. 31, 2020
Feb. 12, 2021
Jun. 30, 2020
Cover [Abstract]      
Document Type 10-K    
Amendment Flag false    
Document Fiscal Year Focus 2020    
Document Period End Date Dec. 31, 2020    
Document Annual Report true    
Document Transition Report false    
Entity File Number 1-12744    
Entity Registrant Name MARTIN MARIETTA MATERIALS, INC.    
Document Fiscal Period Focus FY    
Trading Symbol MLM    
Entity Central Index Key 0000916076    
Entity Incorporation, State or Country Code NC    
Entity Tax Identification Number 56-1848578    
Entity Address, Address Line One 2710 Wycliff Road    
Entity Address, City or Town Raleigh    
Entity Address, State or Province NC    
Entity Address, Postal Zip Code 27607-3033    
City Area Code 919    
Local Phone Number 781-4550    
Title of 12(b) Security Common Stock (par value $.01 per share)    
Security Exchange Name NYSE    
Entity Well-known Seasoned Issuer Yes    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Interactive Data Current Yes    
Entity Filer Category Large Accelerated Filer    
Entity Shell Company false    
Entity Common Stock, Shares Outstanding   62,286,775  
Entity Public Float     $ 11,377,742,588
Entity Emerging Growth Company false    
Entity Small Business false    
Current Fiscal Year End Date --12-31    
ICFR Auditor Attestation Flag true    
Documents Incorporated by Reference

DOCUMENTS INCORPORATED BY REFERENCE

 

Document

 

Parts Into Which Incorporated

Proxy Statement for the Annual Meeting of Shareholders to be held May 13, 2021 (Proxy Statement)

 

Part III