POSTRETIREMENT MEDICAL BENEFITS - Additional Information (Detail) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan Transition Obligation Amortization Period	20 years
Workers' Compensation Disclosure [Abstract]
Workers' compensation, beginning of year (including current portion)	$ 9,530,000	$ 11,626,000
Accretion	166,000	204,000
Claims paid	(581,000)	(475,000)
Actuarial changes	(1,654,000)	(1,825,000)
Workers' compensation, end of year	7,461,000	9,530,000
Less current portion	(717,000)	(820,000)
Workers' compensation, less current portion	6,744,000	8,710,000
Workers' compensation discount, percent	3.00%	2.00%
Postretirement Medical Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Prior service costs	(5,720,000)	(6,356,000)
Defined Benefit Plan, Benefit Obligation, Period Increase (Decrease)	49,500,000
Combined Benefit Fund [Member]
Defined Benefit Plan Disclosure [Line Items]
Multiemployer Plan, Period Contributions	$ 2,200,000	$ 2,300,000	$ 2,600,000