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Document and Entity Information - USD ($)
$ in Billions
 12 Months Ended
Dec. 31, 2023
Feb. 23, 2024
Jun. 30, 2023
Cover [Abstract]      
Document Type 10-K    
Amendment Flag false    
Document Period End Date Dec. 31, 2023    
Document Annual Report true    
Document Transition Report false    
Document Fiscal Year Focus 2023    
Document Fiscal Period Focus FY    
Trading Symbol MEG    
Entity Registrant Name Montrose Environmental Group, Inc.    
Entity Central Index Key 0001643615    
Current Fiscal Year End Date --12-31    
Entity Filer Category Large Accelerated Filer    
Entity Small Business false    
Entity Emerging Growth Company false    
Entity Common Stock, Shares Outstanding   30,380,674  
Entity Public Float     $ 1.3
Entity Well-known Seasoned Issuer Yes    
Entity Voluntary Filers No    
Entity Interactive Data Current Yes    
Entity Current Reporting Status Yes    
ICFR Auditor Attestation Flag true    
Document Financial Statement Error Correction [Flag] false    
Entity Shell Company false    
Entity File Number 001-39394    
Entity Tax Identification Number 46-4195044    
Entity Incorporation State Country Code DE    
Entity Address Address Line1 5120 Northshore Drive    
Entity Address City Or Town North Little Rock    
Entity Address State Or Province AR    
Entity Address Postal Zip Code 72118    
City Area Code 501    
Local Phone Number 900-6400    
Security12b Title Common Stock, par value $0.000004 per share    
Security Exchange Name NYSE    
Auditor Firm ID 34    
Auditor Name Deloitte & Touche LLP    
Auditor Location Costa Mesa, California    
Documents Incorporated by Reference

Portions of the registrant’s Proxy Statement for the 2024 Annual Meeting of Stockholders are incorporated herein by reference in Part III of this Annual Report on Form 10-K to the extent stated herein. Such proxy statement will be filed with the Securities and Exchange Commission within 120 days of the registrant’s fiscal year ended December 31, 2023.