Leases - Summary of Fixed and Variable Components of Financing 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]
Interest on lease liabilities	$ 759	$ 737	$ 2,233	$ 1,491
Amortization of right-of-use assets	239	243	748	504
Total financing lease costs	$ 998	$ 980	$ 2,981	$ 1,995