Combined Statements of Income for LLCs/LPs Accounted Under Equity Method (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Schedule Of Equity Method Investments [Line Items]
Revenues	$ 99,011	$ 95,575	$ 90,625
Net income	19,234	15,400	21,102
Our share of net income	1,279	1,207	1,191
Equity Method Investment, Nonconsolidated Investee or Group of Investees
Schedule Of Equity Method Investments [Line Items]
Our share of net income	1,279	1,207	1,191
Equity Method Investment, Nonconsolidated Investee or Group of Investees
Schedule Of Equity Method Investments [Line Items]
Revenues	8,707	8,505	8,204
Operating expenses	3,614	3,351	3,177
Depreciation and amortization	1,886	1,873	1,853
Interest, net	584	825	1,061
Net income	$ 2,623	$ 2,456	$ 2,113