Quarterly report pursuant to Section 13 or 15(d)

Acquisitions - Summary of Assets Acquired and Liability Assumed in Conjunction with the Business Combination (Parenthetical) (Detail)

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Acquisitions - Summary of Assets Acquired and Liability Assumed in Conjunction with the Business Combination (Parenthetical) (Detail) - FoA Equity - USD ($)
$ in Millions
Oct. 12, 2020
Sep. 30, 2021
Business Acquisition [Line Items]    
Business combination goodwill deductible for tax purposes   $ 85.2
Expenses considered to have been incurred upon the successful closing of the business combination $ 5.0