Investments - Narrative (Detail) - USD ($)	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024	Dec. 31, 2024
Schedule of Investments [Line Items]
Equity method investments	$ 41,452,000		$ 39,075,000
Gains (losses) on equity method investments	2,358,000	$ 1,790,000
Impairment charge on equity method investments	0	0
Equity method investment, amount sold	0	0
Investments carried under measurement alternative	192,000		192,000
Equity investments carried under measurement alternative, gain	0	0
Equity investments carried under measurement alternative, loss	0	0
Impairments related to investments	0	0
Total assets	4,884,476,000		3,591,967,000
Total liabilities	3,741,525,000		2,512,728,000
Maximum exposure to loss	1,700,000		1,300,000
Variable interest entity, primary beneficiary
Schedule of Investments [Line Items]
Total assets	6,100,000		5,300,000
Total liabilities	1,300,000		$ 1,200,000
Other nonoperating income (expense)
Schedule of Investments [Line Items]
Equity investments carried under measurement alternative, gain	$ 600,000	$ 36,600,000