Investments - Narrative (Detail) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024	Dec. 31, 2024
Schedule of Investments [Line Items]
Equity method investments	$ 43,381,000		$ 43,381,000		$ 39,075,000
Gains (losses) on equity method investments	2,379,000	$ 2,744,000	4,737,000	$ 4,534,000
Impairment charge on equity method investments	0	0	0	0
Equity method investment, amount sold	0	0	0	0
Investments carried under measurement alternative	192,000		192,000		192,000
Equity investments carried under measurement alternative, gain	0	0	0	0
Equity investments carried under measurement alternative, loss	0	0	0	0
Impairments related to investments	0	0	0	0
Total assets	4,892,042,000		4,892,042,000		3,591,967,000
Total liabilities	3,783,359,000		3,783,359,000		2,512,728,000
Maximum exposure to loss	2,300,000		2,300,000		1,300,000
Variable interest entity, primary beneficiary
Schedule of Investments [Line Items]
Total assets	8,000,000.0		8,000,000.0		5,300,000
Total liabilities	1,600,000		1,600,000		$ 1,200,000
Other nonoperating income (expense)
Schedule of Investments [Line Items]
Equity investments carried under measurement alternative, gain	$ 100,000	$ 0	$ 700,000	$ 36,700,000