Short-Term Borrowing - Additional Information (Detail)	1 Months Ended	3 Months Ended	12 Months Ended
	Feb. 28, 2021 USD ($)	Dec. 31, 2020 USD ($)	Dec. 31, 2022 USD ($)	Dec. 31, 2020 USD ($)	Dec. 31, 2021 USD ($)
Short-term Debt [Line Items]
Short-term borrowings			$ 202,157,000		$ 221,634,000
Line of Credit Facility, Aggregate Borrowing Capacity			$ 200,000,000
Number Of Unsecured Bank Credit Facilities			3
Short-term Debt, Weighted Average Interest Rate, at Point in Time			5.04%		0.83%
Ratio of Indebtedness to Net Capital			0.65
Long-term debt including current maturities			$ 600,800,000		$ 568,800,000
Line of Credit Facility, Commitment Fee Percentage			9500.00%
Line of Credit Facility, Remaining Borrowing Capacity			$ 192,000,000
Notional Amount of Nonderivative Instruments		$ 60,000,000	50,000,000	$ 100,000,000
Financing Receivable, Revolving			400,000,000
Amount of letter of credit to our current primary insurance company			5,800,000
Subsequent Event
Short-term Debt [Line Items]
Notional Amount of Nonderivative Instruments	$ 40,000,000
Fixed Swap Rate	0.17%
Revolving Credit Facility [Member]
Short-term Debt [Line Items]
Line of Credit Facility, Aggregate Borrowing Capacity			$ 400,000,000
Interest Rate Swap Rate, Low Range [Member]
Short-term Debt [Line Items]
Fixed Swap Rate		0.20%		0.2615%
Interest Rate Swap Rate, High Range [Member]
Short-term Debt [Line Items]
Fixed Swap Rate		0.205%	3.98%	0.3875%
Revolving Line of Credit, Short-term
Short-term Debt [Line Items]
Financing Receivable, Revolving			$ 200,000,000
Debt Instrument, Interest Rate, Stated Percentage			7000.00%
Aggregate Investment, Maximum			$ 150,000,000
Ownership Interest			0.50
Borrowings Outstanding, Sustainable Investing			$ 9,400,000
Interest Rate Credit Adjustment			10
Revolving Line of Credit, Long-term
Short-term Debt [Line Items]
Debt Instrument, Fee			9
Interest Rate Credit Adjustment			10