Leases - Summary of Maturity of Undiscounted Payments Due under Lease Liabilities and Present Value of Those Liabilities (Detail) $ in Thousands	Sep. 30, 2019 USD ($)
Leases [Abstract]
2019	$ 1,997
2020	9,334
2021	8,816
2022	7,345
2023	7,363
Thereafter	23,254
Total	58,109
Present value adjustment	(16,477)
Present value of lease liabilities	$ 41,632