FAIR VALUE OF FINANCIAL INSTRUMENTS (Debt) (Detail) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Carrying Value	$ 834,802	$ 760,639
Estimated Fair Value	878,223	794,431
Long-term Debt, Gross	825,000	750,000
Debt Issuance Costs, Net	(534)	(594)
Deferred Gain (Loss) on Discontinuation of Interest Rate Fair Value Hedge	10,336	11,233
Revolving Credit Facility [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Carrying Value	75,000
Estimated Fair Value	75,000
3.84% Senior notes due 2021 [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Carrying Value	100,000	100,000
Estimated Fair Value	$ 102,137	102,079
Debt Instrument, Interest Rate, Stated Percentage	3.84%
3.70% Senior notes due 2023 [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Carrying Value	$ 202,500	202,500
Estimated Fair Value	$ 209,416	207,882
Debt Instrument, Interest Rate, Stated Percentage	3.70%
3.85% Senior notes due 2025 [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Carrying Value	$ 90,000	90,000
Estimated Fair Value	$ 95,028	93,838
Debt Instrument, Interest Rate, Stated Percentage	3.85%
4.24% Senior notes due 2026 [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Carrying Value	$ 200,000	200,000
Estimated Fair Value	$ 217,026	213,126
Debt Instrument, Interest Rate, Stated Percentage	4.24%
4.05% Senior notes due 2028 [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Carrying Value	$ 67,500	67,500
Estimated Fair Value	$ 72,655	71,260
Debt Instrument, Interest Rate, Stated Percentage	4.05%
4.11% Senior Notes [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Carrying Value	$ 90,000	90,000
Estimated Fair Value	$ 97,159	95,607
Debt Instrument, Interest Rate, Stated Percentage	4.11%
Long-term Debt, gross [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Estimated Fair Value	$ 868,421	$ 783,792

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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-Section 50
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- Definition

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

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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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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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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
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-Section 50
-Paragraph 4
-Subparagraph (b)(3)
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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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