REMEDIAL LIABILITIES (Estimates) (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2016 USD ($) site facility	Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)
Site Contingency [Line Items]
Remedial Liability	$ 128,007	$ 131,992	$ 155,121
% of Total	100.00%
Reasonably possible additional liabilities	$ 23,380
Legal and Administrative Proceedings
Site Contingency [Line Items]
Remedial Liability	18,200
Reasonably possible additional liabilities	1,900
Facilities now used in active conduct of the Company's business (48 facilities)
Site Contingency [Line Items]
Remedial Liability	$ 55,467
% of Total	43.30%
Reasonably possible additional liabilities	$ 11,862
Number of facility by type | facility	48
Inactive facilities not now used in active conduct of the Company's business but most of which were acquired because the assumption of remedial liabilities for such facilities was part of the purchase price for the CSD assets (35 facilities)
Site Contingency [Line Items]
Remedial Liability	$ 64,151
% of Total	50.10%
Reasonably possible additional liabilities	$ 10,679
Number of facility by type | facility	35
Superfund sites owned by third parties (17 sites)
Site Contingency [Line Items]
Remedial Liability	$ 8,389
% of Total	6.60%
Reasonably possible additional liabilities	$ 839
Number of facility by type | site	17
Superfund sites owned by third parties (17 sites) | Various
Site Contingency [Line Items]
Remedial Liability	$ 8,389
% of Total	6.60%
Reasonably possible additional liabilities	$ 839
Number of facility by type | site	17
Closed incinerator and landfill | Baton Rouge LA
Site Contingency [Line Items]
Remedial Liability	$ 23,256
% of Total	18.20%
Reasonably possible additional liabilities	$ 3,940
Closed incinerator | Bridgeport, NJ
Site Contingency [Line Items]
Remedial Liability	$ 19,059
% of Total	14.90%
Reasonably possible additional liabilities	$ 2,590
Idled incinerator and legal proceedings | Mercier Quebec
Site Contingency [Line Items]
Remedial Liability	$ 9,510
% of Total	7.40%
Reasonably possible additional liabilities	$ 1,008
Operating solvent recycling center | Linden, NJ
Site Contingency [Line Items]
Remedial Liability	$ 7,781
% of Total	6.10%
Reasonably possible additional liabilities	$ 842
All other incinerators, landfills, wastewater treatment facilities and service centers (79 facilities) | Various
Site Contingency [Line Items]
Remedial Liability	$ 60,012
% of Total	46.80%
Reasonably possible additional liabilities	$ 14,161
Number of facility by type | facility	79