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Preferred and Common Stock - Narrative (Details) |  |  | 1 Months Ended | 3 Months Ended | 12 Months Ended |
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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 |  |  |

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