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Number of shares issued for nonredeemable preferred shares and preferred shares redeemable solely at option of issuer. Includes, but is not limited to, preferred shares issued, repurchased, and held as treasury shares. Excludes preferred shares classified as debt.

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Fair value measurements - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Millions		12 Months Ended
	Mar. 01, 2019	Dec. 31, 2024	Jun. 30, 2025	Feb. 21, 2025	Feb. 20, 2025
Fair Value, off-Balance-Sheet Risks, Disclosure Information [Line Items]
Preferred stock at a price			$ 16.23
Convertible Debt [Member]
Fair Value, off-Balance-Sheet Risks, Disclosure Information [Line Items]
Debt Instrument, Face Amount	$ 24.0	$ 24.0
Debt Instrument, Interest Rate, Effective Percentage	2.90%	2.90%
Debt Instrument, Maturity Date	Mar. 01, 2026	Mar. 01, 2026
Series E Preferred Stock [Member]
Fair Value, off-Balance-Sheet Risks, Disclosure Information [Line Items]
Preferred stock at a price		$ 16.23	$ 16.23	$ 16.23
Preferred Stock, Shares Issued		37,391,000		85,000	45,000