Investments - Narrative (Detail) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023	Dec. 31, 2023
Schedule of Investments [Line Items]
Equity method investments	$ 43,016,000		$ 43,016,000		$ 38,122,000
Gains (losses) on equity method investments	2,360,000	$ 2,094,000	6,894,000	$ 6,568,000
Investments carried under measurement alternative	192,000		192,000		192,000
Total assets	4,381,727,000		4,381,727,000		3,175,937,000
Total liabilities	3,338,669,000		3,338,669,000		2,277,781,000
Maximum Exposure to Loss	1,600,000		1,600,000		5,700,000
Variable interest entity, primary beneficiary
Schedule of Investments [Line Items]
Total assets	6,600,000		6,600,000		9,500,000
Total liabilities	1,900,000		1,900,000		$ 1,200,000
Other nonoperating income (expense)
Schedule of Investments [Line Items]
Equity investments carried under measurement alternative, loss	$ 0			$ (1,300,000)
Equity investments carried under measurement alternative, gain		$ 0	$ 36,600,000