Derivative Financial Instruments and Hedging Activities - Additional Information (Detail) $ in Millions	Sep. 30, 2020 USD ($)
Derivative [Line Items]
Cash collateral with counterparty	$ 6.0
Identified Hedge [Member]
Derivative [Line Items]
Derivative, fixed interest rate	1.80%
New Hedges [Member] | Minimum [Member]
Derivative [Line Items]
Derivative, fixed interest rate	0.92%
New Hedges [Member] | Maximum [Member]
Derivative [Line Items]
Derivative, fixed interest rate	0.95%
Additional Hedges [Member] | Minimum [Member]
Derivative [Line Items]
Derivative, fixed interest rate	0.83%
Additional Hedges [Member] | Maximum [Member]
Derivative [Line Items]
Derivative, fixed interest rate	0.86%