Income Taxes - Summary of Deferred Tax Assets and Liabilities (Detail) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Deferred tax assets:
Investment in partnership	$ 46,582	$ 53,464
Tax Receivable Agreement liability	14,087	14,929
Stock-based compensation	4,195	2,666
Foreign Tax Credit	1,090	208
Other carryforwards	898	0
Net operating loss carryforward	756	0
Gross deferred tax assets	67,608	71,267
Valuation allowance	(12,367)	(11,242)
Deferred tax assets, net of valuation allowance	55,241	60,025
Deferred tax liabilities:
Investment in partnership	0	(2,246)
Property and equipment	(833)	(341)
Other	(506)	(232)
Gross deferred tax liabilities	(1,339)	(2,819)
Net deferred tax assets	$ 53,902	$ 57,206