DEBT (Detail) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Debt Instrument [Line Items]
Long-term Debt	$ 1,058,292	$ 760,639
Long Term Debt Fair Value	1,131,414	794,431
Long-term Debt, Gross	1,050,000	750,000
Debt issuance costs, net	(1,147)	(594)
Unamortized interest rate swap proceeds (1)	9,439	11,233
Less: current portion of long-term debt	100,000	0
Long-term debt	958,292	760,639
Carrying Value
Debt Instrument [Line Items]
Less: current portion of long-term debt	100,000	0
Long-term debt	958,292	760,639
Estimated Fair Value
Debt Instrument [Line Items]
Less: current portion of long-term debt	100,000	0
Long-term debt	1,031,414	794,431
3.84% Senior notes due 2021 \| Carrying Value
Debt Instrument [Line Items]
Long-term Debt	100,000	100,000
3.84% Senior notes due 2021 \| Estimated Fair Value
Debt Instrument [Line Items]
Long Term Debt Fair Value	102,173	102,079
3.70% Senior notes due 2023 \| Carrying Value
Debt Instrument [Line Items]
Long-term Debt	202,500	202,500
3.70% Senior notes due 2023 \| Estimated Fair Value
Debt Instrument [Line Items]
Long Term Debt Fair Value	211,790	207,882
3.85% Senior notes due 2025 \| Carrying Value
Debt Instrument [Line Items]
Long-term Debt	90,000	90,000
3.85% Senior notes due 2025 \| Estimated Fair Value
Debt Instrument [Line Items]
Long Term Debt Fair Value	97,429	93,838
4.24% Senior notes due 2026 \| Carrying Value
Debt Instrument [Line Items]
Long-term Debt	200,000	200,000
4.24% Senior notes due 2026 \| Estimated Fair Value
Debt Instrument [Line Items]
Long Term Debt Fair Value	224,390	213,126
4.05% Senior notes due 2028 \| Carrying Value
Debt Instrument [Line Items]
Long-term Debt	67,500	67,500
4.05% Senior notes due 2028 \| Estimated Fair Value
Debt Instrument [Line Items]
Long Term Debt Fair Value	75,440	71,260
4.11% Senior notes due 2028 \| Carrying Value
Debt Instrument [Line Items]
Long-term Debt	90,000	90,000
4.11% Senior notes due 2028 \| Estimated Fair Value
Debt Instrument [Line Items]
Long Term Debt Fair Value	101,047	95,607
3.10% Senior Notes due 2030 \| Carrying Value
Debt Instrument [Line Items]
Long-term Debt	150,000	0
3.10% Senior Notes due 2030 \| Estimated Fair Value
Debt Instrument [Line Items]
Long Term Debt Fair Value	155,805	0
3.20% Senior Notes due 2032 \| Carrying Value
Debt Instrument [Line Items]
Long-term Debt	150,000	0
3.20% Senior Notes due 2032 \| Estimated Fair Value
Debt Instrument [Line Items]
Long Term Debt Fair Value	155,048	0
Long-term Debt, gross [Member]
Debt Instrument [Line Items]
Long Term Debt Fair Value	$ 1,123,122	$ 783,792

Amount of short-term debt and current maturity of long-term debt and capital lease obligations due within one year or the normal operating cycle, if longer.

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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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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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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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Amount after unamortized (discount) premium and debt issuance costs of long-term debt classified as noncurrent and excluding amounts to be repaid within one year or the normal operating cycle, if longer. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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