EMPLOYEE BENEFIT PLANS - Changes in Projected Benefit Obligation and Changes in Plan Assets (Detail) $ in Thousands	4 Months Ended
	Dec. 31, 2020 USD ($)
Changes in plan assets:
Fair vale of plan assets, ending balance	$ 106,000
Pension Plan [Member]
Changes in projected benefit obligation:
Interest cost	900
Actuarial loss	1,321
Benefits paid	(1,539)
Projected benefit obligation, ending balance	108,253
Changes in plan assets:
Actual return on plan assets	2,980
Benefits paid	(1,539)
Fair vale of plan assets, ending balance	105,963
Net benefit obligation	(2,290)
Postretirement Benefit Plan [Member]
Changes in projected benefit obligation:
Interest cost	2
Actuarial loss	28
Benefits paid	(20)
Projected benefit obligation, ending balance	245
Changes in plan assets:
Actual return on plan assets	0
Benefits paid	0
Fair vale of plan assets, ending balance	0
Net benefit obligation	$ (245)