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Leases - Schedule of Components of Lease Expense (Detail) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Occupancy and equipment        
Schedule Of Lease Expense [Line Items]        
Operating lease cost $ 10,245 $ 10,515 $ 30,760 $ 31,179
Amortization on ROU assets 27 0 45 0
Occupancy and equipment | Disposal Group, Held-for-sale, Not Discontinued Operations | Brokerage Insurance        
Schedule Of Lease Expense [Line Items]        
Operating lease cost 900   3,100  
Interest expense        
Schedule Of Lease Expense [Line Items]        
Interest on lease liabilities $ 4 $ 0 $ 7 $ 0