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Common stock (Detail)	9 Months Ended
	Sep. 30, 2025 shares
Class A [Member]
Class of Stock [Line Items]
Shares issued, beginning balance	623,902
Treasury shares, beginning balance	(76,340)
Shares outstanding, beginning balance	547,562
Conversions of Class A to Class B common stock	(24,138)
Conversions of Class A to Class B common stock, Outstanding	(24,138)
Shares issued, ending balance	599,764
Treasury shares, ending balance	(76,340)
Shares outstanding, ending balance	523,424
Class B [Member]
Class of Stock [Line Items]
Shares issued, beginning balance	1,551,291,352
Treasury shares, beginning balance	(215,299,213)
Shares outstanding, beginning balance	1,335,992,139
Conversions of Class A to Class B common stock	36,207,000
Conversions of Class A to Class B common stock, Outstanding	36,207,000
Shares issued, ending balance	1,587,498,352
Treasury shares, ending balance	(215,299,213)
Shares outstanding, ending balance	1,372,199,139

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