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Common Stock - Selected Terms Of Class A Common Stock and Class B Common Stock Narrative (Details)	Dec. 31, 2020 vote
Class of Stock [Line Items]
Threshold of affirmative votes of Class A Common Stock outstanding for automatic conversion to Class B Common Stock (at least)	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%
Class B Common Stock
Class of Stock [Line Items]
Number of votes per share	1
Class A Common Stock
Class of Stock [Line Items]
Number of votes per share	29
Number of votes per share, if not serving as Company director or executive officer	11

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- Definition

Number Of Votes Per Share

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Number Of Votes Per Share, If Not Serving As Company Director Or Executive Officer

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- Definition

Threshold Of Affirmative Votes Of Class A Common Stock Outstanding For Automatic Conversion To Class B Common Stock

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- Definition

Threshold Of Bentley Family Ownership Of Issued And Outstanding Class B Common Stock, Fully Diluted Basis, Automatic Conversion Of Class A Common Stock

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