PENSION, PROFIT SHARING, AND OTHER EMPLOYEE BENEFIT PLANS - Plan's funded status (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Reconciliation of Projected Benefit Obligation:
Projected obligation at beginning of period	$ 45,497	$ 40,152
Interest cost	1,437	1,609	$ 1,540
Actuarial loss	290	371
Benefit payments	(1,470)	(1,695)
Increase related to change in assumptions	6,672	5,060
Projected obligation at period end	52,426	45,497	40,152
Reconciliation of Fair Value of Plan Assets:
Fair value of plan assets at beginning period	43,457	37,772
Actual return on plan assets	6,370	7,195
Contribution	0	185
Benefit payments	(1,470)	(1,695)
Fair value of plan assets at end of period	48,357	43,457	37,772
Funded status at period end	(4,069)	(2,040)
Accumulated benefit obligation at period end	52,426	45,497
Unrecognized net actuarial loss	12,719	11,177	12,352
Net periodic pension cost not yet recognized	$ 12,719	$ 11,177	$ 12,352