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Operating Leases - Schedule of Operating Lease Cost, Included in Selling, General and Administrative Expense (Detail) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Operating lease cost:    
Lease cost $ 6,589 $ 6,263
Variable lease cost 1,400 1,396
Sublease income (33) (77)
Total operating lease cost $ 7,956 $ 7,582