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Leases- Components of Lease Expense (Detail) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Leases [Abstract]        
Operating lease cost $ 10,715 $ 10,500 $ 31,704 $ 29,209
Variable lease cost 1,611 543 3,701 3,073
Total lease cost $ 12,326 $ 11,043 $ 35,405 $ 32,282