FAIR VALUE OF FINANCIAL INSTRUMENTS (Debt) (Detail) - USD ($) $ in Thousands	Jun. 30, 2016	Feb. 29, 2016	Dec. 31, 2015
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Carrying Value	$ 967,564		$ 953,205
Estimated Fair Value	1,024,290		960,271
Long-term Debt, Gross	951,113		954,342
Debt Issuance Costs, Net	(1,060)		(1,137)
Deferred Gain (Loss) on Discontinuation of Interest Rate Fair Value Hedge	17,511	$ 18,258
5.51% Senior notes due 2017 [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Carrying Value	150,000		150,000
Estimated Fair Value	$ 156,982		158,024
Debt Instrument, Interest Rate, Stated Percentage	5.51%
3.84% Senior notes due 2021 [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Carrying Value	$ 100,000		100,307
Estimated Fair Value	$ 105,589		100,307
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	$ 225,000		225,000
Estimated Fair Value	$ 235,497		224,322
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	$ 100,000		100,450
Estimated Fair Value	$ 105,565		100,450
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		201,422
Estimated Fair Value	$ 216,485		201,422
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	$ 75,000		75,904
Estimated Fair Value	$ 79,699		75,904
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	$ 100,000		100,000
Estimated Fair Value	$ 106,909		99,720
Debt Instrument, Interest Rate, Stated Percentage	4.11%
Other debt [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Carrying Value	$ 1,113		1,259
Estimated Fair Value	1,113		1,259
Long-term Debt, gross [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Estimated Fair Value	$ 1,007,839		$ 961,408

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.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(22))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(16))
-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(16))
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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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
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-URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28555-108399

Reference 2: http://www.xbrl.org/2003/role/presentationRef
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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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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
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-SubTopic 25
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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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(a)(16))
-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

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-Section S99
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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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