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Preferred and Common Stock - Narrative (Details) |  | 1 Months Ended | 3 Months Ended | 12 Months Ended
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Jun. 30, 2024 | Feb. 26, 2025 $ / shares | May 31, 2022 USD ($) | Dec. 31, 2024 USD ($) vote $ / shares shares | Sep. 30, 2024 $ / shares | Jun. 30, 2024 $ / shares | Mar. 31, 2024 USD ($) $ / shares | Dec. 31, 2023 USD ($) $ / shares shares | Sep. 30, 2023 $ / shares | Jun. 30, 2023 $ / shares | Mar. 31, 2023 $ / shares | Dec. 31, 2022 USD ($) $ / shares | Sep. 30, 2022 $ / shares | Jun. 30, 2022 $ / shares | Mar. 31, 2022 $ / shares | Dec. 31, 2024 USD ($) vote $ / shares shares | Dec. 31, 2023 USD ($) $ / shares shares | Dec. 31, 2022 USD ($) $ / shares shares
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 | $ |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 64,359,000 |  | $ 28,250,000
Dividends per share (USD per share) | $ / shares |  |  |  | $ 0.06 | $ 0.06 | $ 0.06 | $ 0.06 | $ 0.05 | $ 0.05 | $ 0.05 | $ 0.05 | $ 0.03 | $ 0.03 | $ 0.03 | $ 0.03 | $ 0.24 | $ 0.20 | $ 0.12
Employee stock purchase plan contributions | $ |  |  |  | $ 5,577,000 |  |  |  | $ 5,790,000 |  |  |  |  |  |  |  | $ 5,577,000 | $ 5,790,000 |
Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends per share (USD per share) | $ / shares |  | $ 0.07 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
2026 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
ESPP |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Employee stock purchase plan contributions | $ |  |  |  | $ 5,577,000 |  |  |  | $ 5,790,000 |  |  |  |  |  |  |  | $ 5,577,000 | $ 5,790,000 |
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 |
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 |  |  |  | $ 200,000,000 |  |  |  |  |  |  |  |  |  |  |
Share repurchase program, expiration date | Jun. 30, 2026 |  | Jun. 30, 2024 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock, reserved for future issuance amount | $ |  |  |  | $ 173,155,000 |  |  |  |  |  |  |  |  |  |  |  | $ 173,155,000 |  |
Repurchase of Class B Common Stock under approved program (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,292,733 | 0 | 896,126
Repurchase of Class B Common Stock under approved program | $ |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 64,359,000 |  | $ 28,250,000
Amount authorized for purchase | $ |  |  |  | $ 250,000,000 |  |  |  |  |  |  |  |  |  |  |  | 250,000,000 |  |
Class B Common Stock | Stock Option |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based compensation tax withholding payment | $ |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 2,195,000 | $ 6,581,000 | $ 9,188,000
Shares withheld for cost of options and tax withholding obligation (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 67,146 | 238,627 | 397,501
Shares exercised, net of shares withheld (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 844,283 | 2,621,959 | 2,613,659
Cash used to settle award | $ |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 4,007,000 | $ 11,715,000 | $ 8,338,000
Class B Common Stock | ESPP |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based compensation tax withholding payment | $ |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 348,000 | $ 845,000 | $ 273,000
Shares withheld for cost of options and tax withholding obligation (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 6,859 | 17,484 | 7,065
Maximum percent of eligible compensation available to contribute |  |  |  | 15.00% |  |  |  |  |  |  |  |  |  |  |  | 15.00% |  |
Maximum employee annual contribution amount | $ |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 25,000 |  |
Shares authorized (in shares) |  |  |  | 25,000,000 |  |  |  |  |  |  |  |  |  |  |  | 25,000,000 |  |
Purchase price of common stock, percent |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 85.00% |  |
Shares issued (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 253,578 | 315,840 | 307,406
Proceeds from issuance of common stock | $ |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 11,228,000 | $ 9,988,000 | $ 10,335,000
Shares purchased (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 260,437 | 333,324 | 314,471
Shares reserved for future issuance (in shares) |  |  |  | 24,018,460 |  |  |  |  |  |  |  |  |  |  |  | 24,018,460 |  |
Class B Common Stock | Bonus Plan Incentive |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares withheld for services tax withholding obligation (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 135,314 | 124,116
Share-based compensation tax withholding payment | $ |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 5,756,000 | $ 5,197,000
Shares issued in connection with Bonus Plan, net (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 282,340 | 247,867 | 445,050
Class B Common Stock | Acquisition Options | Stock Option |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares withheld for cost of options and tax withholding obligation (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 714,822
Shares exercised, net of shares withheld (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 185,178
Cash used to settle award | $ |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 0
Class B Common Stock | Deferred Compensation Arrangement with Individual, by Type of Compensation, Pension and Other Postretirement Benefits |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Deferred compensation arrangement with individual, shares issued (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 4,707,845 | 3,410,006 | 3,541,375
Shares withheld for services tax withholding obligation (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 |  |
Shares withheld for tax withholding obligation (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 935,939 | 500,332
Share-based compensation tax withholding payment | $ |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 38,456,000 | $ 24,246,000
Shares reserved for future issuance (in shares) |  |  |  | 4,349,950 |  |  |  |  |  |  |  |  |  |  |  | 4,349,950 |  |

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