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RETIREMENT BENEFITS - Fair Value of Plan Assets by Asset Category (Detail) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	$ 956,345	$ 869,070
Equity securities—U.S.
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	453,135	414,260
Equity securities—International
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	94,919	86,822
Debt securities
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	397,529	362,020
Cash and cash equivalents
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	$ 10,762	$ 5,968

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Amount of asset segregated and restricted to provide benefit under defined benefit plan. Asset includes, but is not limited to, stock, bond, other investment, earning from investment, and contribution by employer and employee.

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