Combined Statements of Income for LLCs/LPs Accounted Under Equity Method (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Schedule Of Equity Method Investments [Line Items]
Revenues	$ 84,190	$ 78,010	$ 77,163
Net income	109,166	19,447	18,964
Our share of net income	1,796	1,706	1,796
Equity Method Investment, Nonconsolidated Investee or Group of Investees
Schedule Of Equity Method Investments [Line Items]
Revenues	10,575	9,973	10,063
Operating expenses	4,093	3,979	4,046
Depreciation and amortization	2,198	1,827	1,758
Interest, net	1,721	1,296	1,295
Net income	2,563	2,871	2,964
Our share of net income	$ 1,796	$ 1,706	$ 1,796