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FAIR VALUE OF FINANCIAL INSTRUMENTS (Narrative) (Detail) - USD ($) $ in Thousands | 1 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2013 | Jan. 31, 2012 | Dec. 31, 2017 | Dec. 31, 2016
Fair Value Disclosures [Abstract] |  |  |  |
Cash payment received |  |  |  | $ 20,405
3.85% Senior notes due 2025 |  |  |  |
Derivative [Line Items] |  |  |  |
Notional amount | $ 100,000 |  |  |
Stated interest rate | 3.85% |  |  |
Date of maturity |  |  | Feb. 26, 2025 |
Description of variable rate basis | LIBOR |  |  |
Basis spread | 1.77% |  |  |
4.05% Senior notes due 2028 |  |  |  |
Derivative [Line Items] |  |  |  |
Notional amount | $ 75,000 |  |  |
Stated interest rate | 4.05% |  |  |
Date of maturity |  |  | Feb. 26, 2028 |
Description of variable rate basis | LIBOR |  |  |
Basis spread | 1.73% |  |  |
4.24% Senior notes due 2026 |  |  |  |
Derivative [Line Items] |  |  |  |
Notional amount |  | $ 200,000 |  |
Stated interest rate |  | 4.24% |  |
Date of maturity |  |  | Dec. 01, 2026 |
Description of variable rate basis |  | LIBOR |  |
Basis spread |  | 2.02% |  |
Issued amount of debt |  | $ 200,000 |  |
3.84% Senior notes due 2021 |  |  |  |
Derivative [Line Items] |  |  |  |
Notional amount |  | $ 25,000 |  |
Stated interest rate |  | 3.84% |  |
Date of maturity |  |  | Dec. 01, 2021 |
Description of variable rate basis |  | LIBOR |  |
Basis spread |  | 1.90% |  |
Issued amount of debt |  | $ 100,000 |  |

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- Definition Face (par) amount of debt instrument at time of issuance. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=64930739&loc=d3e28878-108400 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28551-108399 + Details
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