ASSOCIATE BENEFIT PLANS - Schedule of Net Periodic Benefit Cost Components of Postretirement Benefits (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Business Acquisition [Line Items]
Service cost	$ 15	$ 15
Interest cost	17	19
Prior service cost amortization	(19)	(19)
Net gain recognition	(11)	(16)
Net periodic benefit cost	2	(1)
Alliance
Business Acquisition [Line Items]
Service cost	10	10
Interest cost	73	75
Expected return on plan assets	(135)	(135)
Prior service cost amortization	0	0
Net gain recognition	0	0
Net periodic benefit cost	$ (52)	$ (50)