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Leases - Supplemental Cash Flow Information Related To Leases (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 cash flows for operating leases $ 1,236 $ 1,236 $ 3,716 $ 3,683
ROUA obtained in exchange for operating lease liabilities $ 93 $ 0 $ 4,161 $ 32,162