FAIR VALUE OF FINANCIAL INSTRUMENTS (Debt) (Detail) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Long-term Debt, Gross	$ 1,050,000	$ 1,050,000
Debt Issuance Costs, Net	(1,038)	(1,147)
Deferred Gain (Loss) on Discontinuation of Interest Rate Fair Value Hedge	8,542	9,439
Carrying Value	1,057,504	1,058,292
Estimated Fair Value	1,110,783	1,131,414
3.84% Senior notes due 2021
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Carrying Value	100,000	100,000
Estimated Fair Value	$ 101,125	102,173
Debt Instrument, Interest Rate, Stated Percentage	3.84%
3.70% Senior notes due 2023
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Carrying Value	$ 202,500	202,500
Estimated Fair Value	$ 210,302	211,790
Debt Instrument, Interest Rate, Stated Percentage	3.70%
3.85% Senior notes due 2025
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Carrying Value	$ 90,000	90,000
Estimated Fair Value	$ 96,308	97,429
Debt Instrument, Interest Rate, Stated Percentage	3.85%
4.24% Senior notes due 2026
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Carrying Value	$ 200,000	200,000
Estimated Fair Value	$ 220,055	224,390
Debt Instrument, Interest Rate, Stated Percentage	4.24%
4.05% Senior notes due 2028
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Carrying Value	$ 67,500	67,500
Estimated Fair Value	$ 73,758	75,440
Debt Instrument, Interest Rate, Stated Percentage	4.05%
4.11% Senior notes due 2028
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Carrying Value	$ 90,000	90,000
Estimated Fair Value	$ 98,562	101,047
Debt Instrument, Interest Rate, Stated Percentage	4.11%
3.10% Senior notes due 2030
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Carrying Value	$ 150,000	150,000
Estimated Fair Value	$ 152,292	155,805
Debt Instrument, Interest Rate, Stated Percentage	3.10%
3.20% Senior notes due 2032
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Carrying Value	$ 150,000	150,000
Estimated Fair Value	$ 150,877	155,048
Debt Instrument, Interest Rate, Stated Percentage	3.20%
Long-term Debt, Gross
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Estimated Fair Value	$ 1,103,279	$ 1,123,122

Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

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- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

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- Definition

Amount, after accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs.

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Amount as of the balance sheet date of the unamortized adjustment to the carrying value of an interest-bearing hedged item made under an effective interest rate fair value hedge that is amortized upon discontinuation of the interest rate fair value hedge.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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- Definition

The fair value amount of long-term debt whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission.

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