REMEDIAL LIABILITIES (Estimates) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Site Contingency [Line Items]
Accrued remedial liabilities	$ 155,121	$ 172,498	$ 183,346
% of Total	100.00%
Reasonably possible additional liabilities	25,784
Legal and administrative proceedings
Site Contingency [Line Items]
Accrued remedial liabilities	27,700
Reasonably possible additional liabilities	2,900
Active landfill facilities
Site Contingency [Line Items]
Accrued remedial liabilities	72,565
% of Total	46.80%
Reasonably possible additional liabilities	13,358
Number of facility by type	49
Inactive landfill facilities
Site Contingency [Line Items]
Accrued remedial liabilities	68,527
% of Total	44.20%
Reasonably possible additional liabilities	11,023
Number of facility by type	42
Superfund landfill sites owned by third parties
Site Contingency [Line Items]
Accrued remedial liabilities	14,029
% of Total	9.00%
Reasonably possible additional liabilities	1,403
Number of facility by type	23
Superfund landfill sites owned by third parties | Various
Site Contingency [Line Items]
Accrued remedial liabilities	14,029
% of Total	9.00%
Reasonably possible additional liabilities	1,403
Number of facility by type	23
Closed incinerator and landfill | Baton Rouge LA
Site Contingency [Line Items]
Accrued remedial liabilities	26,444
% of Total	17.10%
Reasonably possible additional liabilities	4,256
Closed incinerator | Bridgeport, NJ
Site Contingency [Line Items]
Accrued remedial liabilities	18,664
% of Total	12.00%
Reasonably possible additional liabilities	2,565
Idled incinerator and legal proceedings | Mercier Quebec
Site Contingency [Line Items]
Accrued remedial liabilities	13,049
% of Total	8.40%
Reasonably possible additional liabilities	1,436
Operating solvent recycling center | Linden, NJ
Site Contingency [Line Items]
Accrued remedial liabilities	8,395
% of Total	5.40%
Reasonably possible additional liabilities	879
All other incinerators, landfills, wastewater treatment facilities and service centers (87 facilities) | Various
Site Contingency [Line Items]
Accrued remedial liabilities	74,540
% of Total	48.10%
Reasonably possible additional liabilities	$ 15,245
Number of facility by type	87