Subsequent events (Additional Information) (Details) - Subsequent Event [Member]	Aug. 05, 2022 $ / shares
Common Class B [Member]
Subsequent Event [Line Items]
Dividends Payable, Amount Per Share	$ 0.025
Common Class A [Member]
Subsequent Event [Line Items]
Dividends Payable, Date Declared	Aug. 05, 2022
Dividends Payable, Amount Per Share	$ 0.025
Dividends Payable, Date to be Paid	Sep. 07, 2022
Dividends Payable, Date of Record	Aug. 19, 2022

Date the declared dividend will be paid, in YYYY-MM-DD format.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=123431023&loc=d3e4304-108586

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- Definition

The per share amount of a dividend declared, but not paid, as of the financial reporting date.

+ References

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- Definition

Date the dividend to be paid was declared, in YYYY-MM-DD format.

+ References

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- Definition

Date the holder must own the stock to be entitled to the dividend, in YYYY-MM-DD format.

+ References

No definition available.

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- Definition

Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event.

+ References

No definition available.

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