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Executive Bonus Plan (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018
Compensation Related Costs [Abstract] |  |
Cash bonuses (in percent) | 20.00% |
Incentive compensation | $ 31,061 | $ 27,641

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- Definition Percentage of adjusted operating profits paid in the form of cash bonuses. + References No definition available. + Details
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Balance Type: | na
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- Definition Amount of incentive compensation, including cash payments and deferred compensation to plan participants, recognized under Executive Bonus Plan. + References No definition available. + Details
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Namespace Prefix: | bsy_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- References No definition available. + Details
Name: | us-gaap_CompensationRelatedCostsAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration