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Leases - Additional Information (Detail)
$ in Millions
12 Months Ended
Dec. 31, 2020
USD ($)
Lessee Lease Description [Line Items]  
Maximum initial term of leases which are not recorded on balance sheet 12 months
Selling, General and Administrative Expense [Member] | Abandonment of Leases Associated with Office Locations [Member]  
Lessee Lease Description [Line Items]  
Charges $ 16.8
Accelerated amortization of right of use assets 14.7
Accelerated depreciation of leasehold improvements $ 2.1