RETIREMENT BENEFITS - Components of Net Periodic Benefit Cost (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 14,265	$ 13,638	$ 12,505
Interest cost	17,697	23,074	28,316
Expected return on plan assets	(79,453)	(72,122)	(60,567)
Amortization of prior service cost (credit)	243	205	115
Amortization of actuarial losses (gains)	12,479	11,859	16,399
Net periodic benefit credit	(34,769)	(23,346)	(3,232)
Other Postretirement Benefits
Defined Benefit Plan Disclosure [Line Items]
Service cost	107	88	80
Interest cost	363	566	759
Expected return on plan assets	0	0	0
Amortization of prior service cost (credit)	(1,830)	(1,937)	(2,330)
Amortization of actuarial losses (gains)	(311)	(339)	(488)
Net periodic benefit credit	$ (1,671)	$ (1,622)	$ (1,979)