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Leases (Supplemental Cash Flow and Lease Cost Information) (Detail) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Cash Flow, Operating Activities, Lessee [Abstract]        
Operating lease cost $ 2,303 $ 2,127 $ 6,565 $ 6,303
Variable lease cost 754 727 2,085 2,083
Total Lease Cost $ 3,057 $ 2,854 8,650 8,386
Operating cash flows from operating leases     $ 6,528 $ 6,179