FAIR VALUE OF FINANCIAL INSTRUMENTS (Debt) (Detail) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Carrying Value	$ 761,476	$ 762,556
Estimated Fair Value	791,653	763,316
Long-term Debt, Gross	750,000	750,243
Debt Issuance Costs, Net	(654)	(714)
Deferred Gain (Loss) on Discontinuation of Interest Rate Fair Value Hedge	12,130	13,027
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	$ 101,995	100,359
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	$ 207,217	201,813
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	$ 93,385	89,711
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	$ 212,152	202,288
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	$ 70,686	66,942
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	$ 94,742	89,647
Debt Instrument, Interest Rate, Stated Percentage	4.11%
Other debt [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Carrying Value	$ 0	243
Estimated Fair Value	0	243
Long-term Debt, gross [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Estimated Fair Value	$ 780,177	$ 751,003

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
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-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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