Investments - Narrative (Detail) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022	Dec. 31, 2022
Schedule of Investments [Line Items]
Equity method investments	$ 39,800,000		$ 39,800,000		$ 38,400,000
Gains (losses) on equity method investments	2,412,000	$ 2,729,000	4,474,000	$ 5,532,000
Impairment charge on equity method investments	0	0	0	0
Equity method investment, amount sold	0	0	0	0
Equity investments carried under measurement alternative	200,000		200,000		200,000
Equity investments carried under measurement alternative, impairment			0	0
Equity investments carried under measurement alternative, loss	0			0
Equity investments carried under measurement alternative, gain		0	0
Total assets	4,081,687,000		4,081,687,000		3,074,971,000
Total liabilities	3,262,540,000		3,262,540,000		2,326,244,000
Maximum Exposure to Loss	5,200,000		5,200,000		5,500,000
Other nonoperating income (expense)
Schedule of Investments [Line Items]
Equity investments carried under measurement alternative, loss	0	$ 1,800,000	1,300,000	$ 1,900,000
Variable interest entity, primary beneficiary
Schedule of Investments [Line Items]
Total assets	9,100,000		9,100,000		9,200,000
Total liabilities	$ 2,000,000		$ 2,000,000		$ 1,400,000