Retirement Plans - Additional Information (Detail)		12 Months Ended
	Jan. 01, 2021	Dec. 31, 2021 USD ($) retirementPlan shares	Dec. 31, 2020 USD ($) shares	Dec. 31, 2019 USD ($)	Dec. 31, 2008
Retirement Plans [Line Items]
Number of supplemental non-qualified retirement plans sponsored by the Corporation | retirementPlan		2
Consecutive calendar years used to calculate BRP benefits					5 years
Term of employment for consideration of BRP					10 years
Percentage of non callable corporate bonds		10.00%
Expected long-term rate of return on assets	6.75%	6.75%	7.25%	7.25%
Benefits paid		$ 11,000,000	$ 11,000,000
Corporation contribution		$ 1,000,000	7,000,000
Percent of employer match		100.00%
Employee contribution percentage		6.00%
Additional discretionary contribution, annual financial goals, percentage		3.00%
Dividends received on common stock		$ 200,000	$ 200,000
Common Stock
Retirement Plans [Line Items]
Common stock, shares (in shares) | shares		367,500	450,000
Percentage of common stock on total plan assets		2.20%	2.10%
Qualified Pension Plans
Retirement Plans [Line Items]
Benefits paid		$ 9,900,000	$ 10,000,000
Non Qualified Pension Plans
Retirement Plans [Line Items]
Benefits paid		1,400,000	1,500,000
Retirement Income Plan (RIP)
Retirement Plans [Line Items]
Corporation contribution		$ 0	$ 5,000,000	$ 5,000,000