REMEDIAL LIABILITIES (Estimates) (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2015 USD ($) site facility	Dec. 31, 2014 USD ($)	Dec. 31, 2013 USD ($)
Site Contingency [Line Items]
Accrued remedial liabilities	$ 131,992	$ 155,121	$ 172,498
% of Total	100.00%
Reasonably possible additional liabilities	$ 23,636
Legal and administrative proceedings
Site Contingency [Line Items]
Accrued remedial liabilities	18,900
Reasonably possible additional liabilities	1,900
Active Landfill Facilities
Site Contingency [Line Items]
Accrued remedial liabilities	$ 59,022
% of Total	44.70%
Reasonably possible additional liabilities	$ 12,157
Number of facility by type | facility	47
Inactive Landfill Facilities
Site Contingency [Line Items]
Accrued remedial liabilities	$ 63,613
% of Total	48.20%
Reasonably possible additional liabilities	$ 10,543
Number of facility by type | facility	40
Closed incinerator and landfill | Baton Rouge LA
Site Contingency [Line Items]
Accrued remedial liabilities	$ 23,572
% of Total	17.90%
Reasonably possible additional liabilities	$ 3,931
Closed incinerator | Bridgeport, NJ
Site Contingency [Line Items]
Accrued remedial liabilities	$ 18,623
% of Total	14.10%
Reasonably possible additional liabilities	$ 2,568
Idled incinerator and legal proceedings | Mercier Quebec
Site Contingency [Line Items]
Accrued remedial liabilities	$ 9,012
% of Total	6.80%
Reasonably possible additional liabilities	$ 947
Operating solvent recycling center | Linden, NJ
Site Contingency [Line Items]
Accrued remedial liabilities	$ 8,069
% of Total	6.10%
Reasonably possible additional liabilities	$ 867
All other incinerators, landfills, wastewater treatment facilities and service centers (83 facilities) | Various
Site Contingency [Line Items]
Accrued remedial liabilities	$ 63,359
% of Total	48.00%
Reasonably possible additional liabilities	$ 14,387
Number of facility by type | facility	83
Superfund landfill sites owned by third parties
Site Contingency [Line Items]
Accrued remedial liabilities	$ 9,357
% of Total	7.10%
Reasonably possible additional liabilities	$ 936
Number of facility by type | site	17
Superfund landfill sites owned by third parties | Various
Site Contingency [Line Items]
Accrued remedial liabilities	$ 9,357
% of Total	7.10%
Reasonably possible additional liabilities	$ 936
Number of facility by type | site	17