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RETIREMENT BENEFITS - Fair Value of Plan Assets by Asset Category (Detail) - USD ($) $ in Thousands | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | $ 1,024,454 | $ 956,345
Equity securities—U.S. |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 482,381 | 453,135
Equity securities—International |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 100,705 | 94,919
Debt securities |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 422,570 | 397,529
Cash and cash equivalents |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | $ 18,798 | $ 10,762

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