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Document and Entity Information - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2023
Feb. 20, 2024
Jun. 30, 2023
Cover [Abstract]      
Document Type 10-K    
Amendment Flag false    
Document Period End Date Dec. 31, 2023    
Document Fiscal Year Focus 2023    
Document Fiscal Period Focus FY    
Trading Symbol MGRC    
Entity Registrant Name McGRATH RENTCORP    
Security Exchange Name NASDAQ    
Title of 12(b) Security Common Stock    
Entity Interactive Data Current Yes    
Entity File Number 000-13292    
Entity Incorporation, State or Country Code CA    
Entity Tax Identification Number 94-2579843    
Entity Address, Address Line One 5700 Las Positas Road    
Entity Address, City or Town Livermore    
Entity Address, State or Province CA    
Entity Address, Postal Zip Code 94551-7800    
City Area Code 925    
Local Phone Number 606-9200    
Document Annual Report true    
Document Transition Report false    
Entity Central Index Key 0000752714    
Current Fiscal Year End Date --12-31    
Entity Well-known Seasoned Issuer Yes    
Entity Current Reporting Status Yes    
Entity Voluntary Filers No    
Entity Filer Category Large Accelerated Filer    
Entity Shell Company false    
Entity Small Business false    
Entity Emerging Growth Company false    
ICFR Auditor Attestation Flag true    
Entity Common Stock, Shares Outstanding   24,496,233  
Document Financial Statement Error Correction [Flag] false    
Entity Public Float     $ 2,264,372,153
Auditor Firm ID 248    
Auditor Name GRANT THORNTON LLP    
Auditor Location San Francisco, California    
Documents Incorporated by Reference

DOCUMENTS INCORPORATED BY REFERENCE

The information required by Part III (Items 10, 11, 12, 13 and 14) of this Annual Report on Form 10-K will either be incorporated herein by reference to the Company’s Definitive Proxy Statement to be filed pursuant to Regulation 14A of the Exchange Act for its 2024 Annual or Special Meeting of Shareholders or included in an amendment to this Annual Report on Form 10-K, which, in either case, will be filed no later than 120 days after December 31, 2023.