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Related party transactions - Related party transactions with affiliated company - Equity Method - Additional Information (Details) - USD ($)	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Dec. 31, 2023
Related Party Transaction [Line Items]
Equity investment	$ 244,165,000		$ 236,485,000
Return of capital from equity method investments	$ 0	$ 249,000
BHD LEON
Related Party Transaction [Line Items]
Ownership interest	15.84%
BHD LEON \| Cash Distribution
Related Party Transaction [Line Items]
Investment Dividends or distribution	$ 0	0
BHD LEON
Related Party Transaction [Line Items]
Equity investment	233,200,000		$ 225,900,000
Losses (earnings) from investments in equity method investees	$ 7,300,000	$ 9,100,000