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Document and Entity Information - USD ($)
 12 Months Ended
Dec. 31, 2021
Feb. 22, 2022
Jun. 30, 2021
Cover [Abstract]      
Document Type 10-K    
Amendment Flag false    
Document Period End Date Dec. 31, 2021    
Document Fiscal Year Focus 2021    
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   24,260,364  
Entity Public Float     $ 1,958,763,168
Auditor Firm ID 248    
Auditor Name GRANT THORNTON LLP    
Auditor Location San Jose, California    
Documents Incorporated by Reference

DOCUMENTS INCORPORATED BY REFERENCE

McGrath RentCorp’s definitive proxy statement with respect to its 2022 Annual Meeting of Shareholders to be held on June 8, 2022 which will be filed with the Securities and Exchange Commission within 120 days after the end of its fiscal year ended December 31, 2021, is incorporated by reference into Part III (Items 10, 11, 12, and 13).