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Preferred and Common Stock - Narrative (Details)
 1 Months Ended 3 Months Ended 12 Months Ended
Jun. 17, 2021
shares
Sep. 22, 2020
USD ($)
shares
Feb. 27, 2024
$ / shares
Dec. 31, 2023
USD ($)
vote
$ / shares
shares
Sep. 30, 2023
$ / shares
Jun. 30, 2023
$ / shares
Mar. 31, 2023
$ / shares
Dec. 31, 2022
USD ($)
$ / shares
shares
Sep. 30, 2022
$ / shares
Jun. 30, 2022
$ / shares
Mar. 31, 2022
$ / shares
Dec. 31, 2021
$ / shares
Sep. 30, 2021
$ / shares
Jun. 30, 2021
$ / shares
Mar. 31, 2021
$ / shares
Dec. 31, 2023
USD ($)
vote
$ / shares
shares
Dec. 31, 2022
USD ($)
$ / shares
shares
Dec. 31, 2021
USD ($)
$ / shares
shares
May 11, 2022
USD ($)
Class of Stock [Line Items]                                      
Preferred stock shares authorized (in shares)       100,000,000       100,000,000               100,000,000 100,000,000    
Threshold of affirmative votes of class A common Stock outstanding for automatic conversion to class B common Stock (at least)       90.00%                       90.00%      
Threshold of Bentley family ownership of issued and outstanding class B common Stock, fully-diluted basis, automatic conversion of class A common stock       20.00%                       20.00%      
Repurchase of Class B Common Stock under approved program | $                                 $ 28,250,000    
Shares exercised (in shares)                                 900,000    
Dividends per share (USD per share) | $ / shares       $ 0.05 $ 0.05 $ 0.05 $ 0.05 $ 0.03 $ 0.03 $ 0.03 $ 0.03 $ 0.03 $ 0.03 $ 0.03 $ 0.03 $ 0.20 $ 0.12 $ 0.12  
Employee stock purchase plan contributions | $       $ 5,790,000       $ 5,230,000               $ 5,790,000 $ 5,230,000    
Subsequent Event                                      
Class of Stock [Line Items]                                      
Dividends per share (USD per share) | $ / shares     $ 0.06                                
ESPP                                      
Class of Stock [Line Items]                                      
Employee stock purchase plan contributions | $       5,790,000       5,230,000               $ 5,790,000 $ 5,230,000    
Two Thousand Twenty Six Notes | Convertible Debt                                      
Class of Stock [Line Items]                                      
Extinguishment of debt | $       2,170,000       2,170,000                      
Repayments of senior debt | $       $ 1,998,000       $ 1,998,000                      
Class B Common Stock                                      
Class of Stock [Line Items]                                      
Common stock shares authorized (in shares)       1,800,000,000       1,800,000,000               1,800,000,000 1,800,000,000    
Number of votes per share | vote       1                       1      
Stock repurchase program, authorized amount | $                                     $ 200,000,000
Repurchase of Class B Common Stock under approved program (in shares)                               0 896,126    
Repurchase of Class B Common Stock under approved program | $                                 $ 28,250,000    
Common stock, reserved for future issuance amount | $       $ 169,752,000                       $ 169,752,000      
Amount authorized for purchase | $       $ 250,000,000                       250,000,000      
Class B Common Stock | Deferred Compensation Arrangement with Individual, by Type of Compensation, Pension and Other Postretirement Benefits                                      
Class of Stock [Line Items]                                      
Share-based compensation tax withholding payment | $                               $ 38,456,000 $ 24,246,000 $ 69,007,000  
Deferred compensation arrangement with individual, shares issued (in shares)                               3,410,006 3,541,375 2,378,645  
Deferred compensation arrangement with individual, shares issued, gross (in shares)                               4,345,945 4,041,707 3,820,099  
Shares withheld for tax withholding obligation (in shares)                               935,939 500,332 1,441,454  
Shares reserved for future issuance (in shares)       4,421,623                       4,421,623      
Class B Common Stock | Bonus Plan Incentive                                      
Class of Stock [Line Items]                                      
Shares exercised, net of shares withheld (in shares)                               247,867 445,050 238,755  
Shares withheld for cost of options and tax withholding obligation (in shares)                               135,314 124,116 168,718  
Share-based compensation tax withholding payment | $                               $ 5,756,000 $ 5,197,000 $ 8,739,000  
Shares exercised (in shares)                               383,181 569,166 407,473  
Class B Common Stock | Stock Option                                      
Class of Stock [Line Items]                                      
Shares exercised, net of shares withheld (in shares)                               2,621,959 2,613,659 4,587,053  
Shares withheld for cost of options and tax withholding obligation (in shares)                               238,627 397,501 1,066,498  
Share-based compensation tax withholding payment | $                               $ 6,581,000 $ 9,188,000 $ 37,785,000  
Cash used to settle award | $                               $ 11,715,000 $ 8,338,000 $ 5,605,000  
Class B Common Stock | Stock Option | Acquisition Options                                      
Class of Stock [Line Items]                                      
Shares exercised, net of shares withheld (in shares)                               185,178      
Shares withheld for cost of options and tax withholding obligation (in shares)                               714,822      
Cash used to settle award | $                               $ 0      
Class B Common Stock | ESPP                                      
Class of Stock [Line Items]                                      
Shares withheld for cost of options and tax withholding obligation (in shares)                               17,484 7,065 6,770  
Share-based compensation tax withholding payment | $                               $ 845,000 $ 273,000 $ 438,000  
Maximum percent of eligible compensation available to contribute   15.00%                                  
Maximum employee annual contribution amount | $   $ 25,000                                  
Shares reserved for future issuance (in shares)   25,000,000   24,272,038                       24,272,038      
Purchase price of common stock, percent   85.00%                                  
Shares issued (in shares)                               315,840 307,406 104,716  
Proceeds from issuance of common stock | $                               $ 9,988,000 $ 10,335,000 $ 3,846,000  
Shares purchased (in shares)                               333,324 314,471 111,486  
Class B Common Stock | Seequent                                      
Class of Stock [Line Items]                                      
Number of shares sold (in shares) 3,141,342                                    
Class A Common Stock                                      
Class of Stock [Line Items]                                      
Common stock shares authorized (in shares)       100,000,000       100,000,000               100,000,000 100,000,000    
Number of votes per share | vote       29                       29      
Number of votes per share, if not serving as company director or executive officer | vote       11                       11      
Common stock shares converted (in shares)                               64,130