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Leases - Schedule of Components of Lease Expense (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Finance lease cost:    
Total $ 24,444 $ 17,275
occupancy/equipment expense    
Lessee, Lease, Description [Line Items]    
Operating lease cost 23,548 17,001
occupancy expense    
Finance lease cost:    
Amortization of right-of-use assets 1,044 651
Short-term lease cost 0 6
Sub-lease income (512) (703)
interest expense    
Finance lease cost:    
Interest on lease liabilities $ 364 $ 320