LEGAL PROCEEDINGS - Additional Information (Detail) - USD ($) $ in Thousands						9 Months Ended
	Oct. 07, 2019	Jul. 30, 2019	Mar. 25, 2019	Feb. 25, 2019	Oct. 17, 2017	Sep. 30, 2019
Loss Contingencies [Line Items]
Number of days to appeal fine	30 days
Washington Ecology
Loss Contingencies [Line Items]
Environmental issued associated notice of penalty, assessing fine	$ 1,900
Siu Settlement
Loss Contingencies [Line Items]
Awarded payment from insurance carriers		$ 1,250		$ 7,500
Receivable from applicable insurance		$ 6,250
Definitive settlement agreement
Loss Contingencies [Line Items]
Litigation settlement amount, common fund established					$ 295,000
Proposed Securities Class Action Settlement
Loss Contingencies [Line Items]
Litigation settlement amount, common fund established			$ 45,000			$ 45,000