Condensed Combined Statements of Income (Unaudited) for LLCs/LPs Accounted Under Equity Method (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Schedule Of Equity Method Investments [Line Items]
Revenues	$ 24,494	$ 24,223	$ 74,369	$ 71,255
Net income			14,573	11,807
Our share of net income	300	314	956	953
Equity Method Investment, Nonconsolidated Investee or Group of Investees
Schedule Of Equity Method Investments [Line Items]
Revenues	2,217	2,269	6,524	6,538
Operating expenses	951	967	2,675	2,684
Depreciation and amortization	476	478	1,422	1,394
Interest, net	142	199	443	638
Net income	648	625	1,984	1,822
Equity Method Investment, Nonconsolidated Investee or Group of Investees
Schedule Of Equity Method Investments [Line Items]
Our share of net income	$ 300	$ 314	$ 956	$ 953