EMPLOYEE BENEFIT PLANS - Summary of Financial Data Relative to the Pension Plans and the Postretirement Benefit Plan (Detail) $ in Thousands	4 Months Ended
	Dec. 31, 2020 USD ($)
Weighted average assumptions used to determine net periodic pension cost:
Expected return on plan assets	5.99%
Pension Plan [Member]
Net periodic benefit income:
Interest cost	$ 900
Expected return on plan assets	(2,062)
Net periodic benefit income	(1,162)
Pre-tax amounts recognized in OCI:
Net actuarial loss	404
Net amount recognized in OCI	404
Total net periodic pension income recognized in total comprehensive income, pre-tax	$ (758)
Weighted average assumptions used to determine net periodic pension cost:
Discount Rate	2.36%
Expected return on plan assets	5.99%
Postretirement Benefit Plan [Member]
Net periodic benefit income:
Interest cost	$ 2
Expected return on plan assets	0
Net periodic benefit income	2
Pre-tax amounts recognized in OCI:
Net actuarial loss	28
Net amount recognized in OCI	28
Total net periodic pension income recognized in total comprehensive income, pre-tax	$ 30
Weighted average assumptions used to determine net periodic pension cost:
Discount Rate	2.44%