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Leases - Summary of our 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 $ 2,864 $ 2,837 $ 8,657 $ 8,800
Financing lease cost:        
Amortization of leased assets 38 171 219 548
Interest on lease liabilities 31 8 80 35
Total lease cost $ 2,933 $ 3,016 $ 8,956 $ 9,383