Leases - Schedule of Future Minimum Rental Payments For Finance and Operating Leases (Detail) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Leases [Abstract]
Finance Leases, 2019	$ 247
Finance Leases, 2020	824
Finance Leases, 2021	560
Finance Leases, 2022	224
Finance Leases, 2023	5
Finance Leases, Total	1,860
Finance Leases, Less: Imputed Interest	(60)
Finance Leases, Total lease liabilities, net of interest	1,800
Operating Leases, 2019	835
Operating Leases, 2020	3,227
Operating Leases, 2021	2,823
Operating Leases, 2022	2,409
Operating Leases, 2023	2,140
Operating Leases, Thereafter	6,859
Operating Leases, Total	18,293
Operating Leases, Less: Imputed Interest	(2,091)
Operating Leases, Total lease liabilities, net of interest	$ 16,202
2019		$ 4,249
2020		3,232
2021		2,870
2022		2,635
2023		2,346
Thereafter		7,647
Total		$ 22,979