Leases - Supplemental Balance Sheet Information Related to Operating and Financing Leases (Detail) $ in Thousands	Sep. 30, 2020 USD ($)
Leases [Abstract]
Right-of-use assets - operating	$ 6,192
Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List]	us-gaap:OtherAssets
Right-of-use assets - finance	$ 237
Finance Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List]	us-gaap:OtherAssets
Lease Liability - operating	$ (7,880)
Operating Lease, Liability, Statement of Financial Position [Extensible List]	us-gaap:OtherLiabilities
Lease Liability - finance	$ (270)
Finance Lease, Liability, Statement of Financial Position [Extensible List]	us-gaap:OtherLiabilities