Financial Guarantees - Additional Information (Detail) - USD ($)	3 Months Ended
	Mar. 31, 2020	Dec. 31, 2019
Financial Guarantees [Line Items]
Term of standby letters of credit, years	1 year
Notional amount of standby letters of credit	$ 82,400,000	$ 87,800,000
Carrying value of letters of credit	500,000	600,000
Notional amounts	905,500,000	$ 665,500,000
Interest Rate Swap
Financial Guarantees [Line Items]
Notional amounts	$ 50,100,000