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Basis of Presentation and Significant Accounting Policies- Property and Equipment (Details)	12 Months Ended
	Dec. 31, 2019
Minimum
Property, Plant and Equipment [Line Items]
Estimated useful lives	3 years
Maximum
Property, Plant and Equipment [Line Items]
Estimated useful lives	25 years
Building and improvements
Property, Plant and Equipment [Line Items]
Estimated useful lives	25 years
Computer Equipment [Member]
Property, Plant and Equipment [Line Items]
Estimated useful lives	3 years
Furniture, fixtures, and equipment
Property, Plant and Equipment [Line Items]
Estimated useful lives	5 years
Aircraft
Property, Plant and Equipment [Line Items]
Estimated useful lives	6 years
Automobiles [Member]
Property, Plant and Equipment [Line Items]
Estimated useful lives	3 years

X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
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Balance Type:	na
Period Type:	duration

X

- Definition

Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment.

+ References

No definition available.

+ Details

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- Details

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- Details

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X

- Details

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X

- Details

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Namespace Prefix:
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Balance Type:
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X

- Details

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X

- Details

Name:	us-gaap_PropertyPlantAndEquipmentByTypeAxis=bsy_AircraftMember
Namespace Prefix:
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Balance Type:
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X

- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: