DEBT (Narrative) (Detail) - USD ($) $ in Thousands		12 Months Ended
	Oct. 15, 2018	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Aug. 13, 2020	Oct. 31, 2018	Sep. 30, 2018	Sep. 26, 2013	Feb. 26, 2013	Dec. 08, 2011
Debt Instrument [Line Items]
Interest payments made		$ 40,000	$ 31,000	$ 30,000
Interest rate description		Borrowings under the credit agreement accrue interest based on (i) Libor or (ii) a base rate of the highest of (a) the federal funds rate plus 0.5%, (b) BofA’s announced prime rate, or (c) the Eurocurrency rate plus 1%, plus a margin. The interest rate and level of facility fees are dependent on certain financial ratios, as defined in the Credit Agreement. The Credit Agreement also provides customary fees, including administrative agent and commitment fees. In connection with the Credit Agreement, the Corporation paid customary transaction fees that have been deferred and are being amortized over the term of the Credit Agreement.
Debt to capitalization limit		60.00%
Long-term Debt		$ 1,050,610	1,058,292
2013 Senior Notes
Debt Instrument [Line Items]
Date of issuance		Feb. 26, 2013
Issued amount of debt									$ 500,000
Repayments of Long-term Debt	$ 50,000
3.70% Senior notes due 2023
Debt Instrument [Line Items]
Issued amount of debt									$ 225,000
Date of maturity		Feb. 26, 2023
Stated interest rate		3.70%							3.70%
3.85% Senior notes due 2025
Debt Instrument [Line Items]
Issued amount of debt									$ 100,000
Date of maturity		Feb. 26, 2025
Stated interest rate		3.85%							3.85%
4.05% Senior notes due 2028
Debt Instrument [Line Items]
Issued amount of debt									$ 75,000
Date of maturity		Feb. 26, 2028
Stated interest rate		4.05%							4.05%
4.11% Senior notes due 2028
Debt Instrument [Line Items]
Date of issuance		Sep. 26, 2013
Issued amount of debt								$ 100,000
Date of maturity		Sep. 26, 2028
Stated interest rate		4.11%						4.11%
2011 Notes
Debt Instrument [Line Items]
Date of issuance		Dec. 08, 2011
Issued amount of debt										$ 300,000
3.84% Senior notes due 2021
Debt Instrument [Line Items]
Issued amount of debt										$ 100,000
Date of maturity		Dec. 01, 2021
Stated interest rate		3.84%								3.84%
4.24% Senior notes due 2026
Debt Instrument [Line Items]
Issued amount of debt										$ 200,000
Date of maturity		Dec. 01, 2026
Stated interest rate		4.24%								4.24%
3.20% Senior Notes due 2032
Debt Instrument [Line Items]
Issued amount of debt					$ 150,000
Stated interest rate		3.20%			3.20%
3.10% Senior Notes due 2030
Debt Instrument [Line Items]
Issued amount of debt					$ 150,000
Stated interest rate		3.10%			3.10%
Two Thousand Twenty Senior Notes [Member]
Debt Instrument [Line Items]
Date of issuance		Aug. 13, 2020
Issued amount of debt					$ 300,000
Revolving credit facility
Debt Instrument [Line Items]
Long-term Debt		$ 93,900
Revolving credit facility
Debt Instrument [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity						$ 500,000
Line Of Credit Facility Additional Borrowing Capacity						$ 200,000	$ 100,000
Standby letters of credit
Debt Instrument [Line Items]
Letters of credit		$ 21,100	$ 21,100
Revolving credit facility
Debt Instrument [Line Items]
Weighted-average interest rate		1.00%	1.40%
Unused credit available under the credit facility		$ 385,000
Long-term debt
Debt Instrument [Line Items]
Weighted-average interest rate		3.40%
Unused credit available under the credit facility		$ 1,600,000