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Cover - USD ($)
$ in Billions
 12 Months Ended
Dec. 31, 2021
Feb. 22, 2022
Jun. 30, 2021
Document Information [Line Items]      
Document Type 10-K    
Document Annual Report true    
Document Period End Date Dec. 31, 2021    
Current Fiscal Year End Date --12-31    
Document Transition Report false    
Entity File Number 001-39548    
Entity Registrant Name BENTLEY SYSTEMS, INCORPORATED    
Entity Incorporation, State or Country Code DE    
Entity Tax Identification Number 95-3936623    
Entity Address, Address Line One 685 Stockton Drive    
Entity Address, City or Town Exton    
Entity Address, State or Province PA    
Entity Address, Postal Zip Code 19341    
City Area Code 610    
Local Phone Number 458-5000    
Title of 12(b) Security Class B Common Stock, par value $0.01 per share    
Trading Symbol BSY    
Security Exchange Name NASDAQ    
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 Small Business false    
Entity Emerging Growth Company false    
ICFR Auditor Attestation Flag true    
Entity Shell Company false    
Entity Public Float     $ 7.0
Documents Incorporated by Reference Portions of the proxy statement for registrant’s Annual Meeting of Stockholders (the “Proxy Statement”) are incorporated by reference in Part III of this Form 10‑K to the extent stated herein. The Proxy Statement will be filed within 120 days of the registrant’s fiscal year ended December 31, 2021.    
Auditor Name KPMG LLP    
Auditor Location Philadelphia, Pennsylvania    
Auditor Firm ID 185    
Central Index Key 0001031308    
Amendment Flag false    
Document Fiscal Period Focus FY    
Document Fiscal Year Focus 2021    
Class A Common Stock      
Document Information [Line Items]      
Entity Common Stock, Shares Outstanding (in shares)   11,601,757  
Class B Common Stock      
Document Information [Line Items]      
Entity Common Stock, Shares Outstanding (in shares)   272,292,311