Tax Receivable Agreement - Additional Information (Detail) - Tax Receivable Agreement $ in Millions	Sep. 30, 2020 USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items]
Percent of net cash savings payable	85.00%
Percent of cash savings retain the benefit	15.00%
Deferred tax liabilities	$ 88.1
Deferred tax assets	$ 101.6