PENSION, PROFIT SHARING, AND OTHER EMPLOYEE BENEFIT PLANS - Fair values of Company's pension plan assets (Detail) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets, asset category	$ 48,357	$ 43,457	$ 37,772
Quoted Prices in Active Markets for Identical Assets (Level 1)
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets, asset category	14,686	11,518
Significant Other Observable Inputs (Level 2)
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets, asset category	33,671	31,939
Significant Unobservable Inputs (Level 3)
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets, asset category	0	0
Mutual Fund
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets, asset category	48,357	43,457
Mutual Fund | Quoted Prices in Active Markets for Identical Assets (Level 1)
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets, asset category	14,686	11,518
Mutual Fund | Significant Other Observable Inputs (Level 2)
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets, asset category	33,671	31,939
Mutual Fund | Significant Unobservable Inputs (Level 3)
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets, asset category	0	0
Large cap U.S. equity funds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets, asset category	3,322	2,774
Large cap U.S. equity funds | Quoted Prices in Active Markets for Identical Assets (Level 1)
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets, asset category	2,779	1,855
Large cap U.S. equity funds | Significant Other Observable Inputs (Level 2)
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets, asset category	543	919
Large cap U.S. equity funds | Significant Unobservable Inputs (Level 3)
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets, asset category	0	0
Small/Mid cap U.S. equity funds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets, asset category	1,124	847
Small/Mid cap U.S. equity funds | Quoted Prices in Active Markets for Identical Assets (Level 1)
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets, asset category	0	0
Small/Mid cap U.S. equity funds | Significant Other Observable Inputs (Level 2)
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets, asset category	1,124	847
Small/Mid cap U.S. equity funds | Significant Unobservable Inputs (Level 3)
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets, asset category	0	0
International equity funds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets, asset category	1,183	894
International equity funds | Quoted Prices in Active Markets for Identical Assets (Level 1)
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets, asset category	1,183	894
International equity funds | Significant Other Observable Inputs (Level 2)
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets, asset category	0	0
International equity funds | Significant Unobservable Inputs (Level 3)
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets, asset category	0	0
Short-term fixed income funds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets, asset category	4,299	3,688
Short-term fixed income funds | Quoted Prices in Active Markets for Identical Assets (Level 1)
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets, asset category	0	0
Short-term fixed income funds | Significant Other Observable Inputs (Level 2)
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets, asset category	4,299	3,688
Short-term fixed income funds | Significant Unobservable Inputs (Level 3)
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets, asset category	0	0
Fixed income funds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets, asset category	38,429	35,254
Fixed income funds | Quoted Prices in Active Markets for Identical Assets (Level 1)
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets, asset category	10,724	8,769
Fixed income funds | Significant Other Observable Inputs (Level 2)
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets, asset category	27,705	26,485
Fixed income funds | Significant Unobservable Inputs (Level 3)
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets, asset category	$ 0	$ 0