SIGNIFICANT ACCOUNTING POLICIES (Landfill Accounting) (Details) (USD $)	12 Months Ended
	Dec. 31, 2014 CubicYards Expansions service_locations Landfill_Sites	Dec. 31, 2013 CubicYards	Dec. 31, 2012 CubicYards
Property, Plant and Equipment [Line Items]
Goodwill impairment charge	$ 123,414,000	$ 0	$ 0
Application approvals	5 years
Number of expansions	3
Number of service locations	3
Percentage of airspace remaining	27.00%
Landfill sites	11
Remaining highly probable airspace	30,544,000
Permitted, but not highly probable airspace	0	0
Remaining Airspace Capacity [Roll Forward]
Remaining capacity, beginning of period	29,323,000	29,643,000	27,557,000
Addition of highly probable airspace, net	2,809,000	1,218,000	3,598,000
Consumed	(1,588,000)	(1,538,000)	(1,512,000)
Remaining capacity, end of period	30,544,000	29,323,000	29,643,000
Landfill final closure and post-closure liabilities	29,900,000	27,600,000
Regulatory post-closure period for landfill	30 years
Inflation rate (as a percent)	1.02%	1.02%
Non-landfill closure and post-closure liabilities	20,800,000	19,500,000
Senior secured notes | Unsecured senior sotes 2020
Remaining Airspace Capacity [Roll Forward]
Asset retirement obligations discount rate (as a percent)	6.54%	6.60%
Permitted
Property, Plant and Equipment [Line Items]
Remaining highly probable airspace	22,306,000
Unpermitted
Property, Plant and Equipment [Line Items]
Remaining highly probable airspace	8,238,000
Landfill assets
Property, Plant and Equipment [Line Items]
Amortization	$ 14,100,000	$ 16,800,000	$ 17,300,000
Non-commercial landfills
Property, Plant and Equipment [Line Items]
Landfill sites	2
Minimum
Remaining Airspace Capacity [Roll Forward]
Non-landfill closure and post-closure liabilities (in years)	10 years
Maximum
Remaining Airspace Capacity [Roll Forward]
Non-landfill closure and post-closure liabilities (in years)	30 years
Altair | Texas
Property, Plant and Equipment [Line Items]
Remaining lives (years)	12 years
Remaining highly probable airspace	834,000
Altair | Texas | Permitted
Property, Plant and Equipment [Line Items]
Remaining highly probable airspace	834,000
Altair | Texas | Unpermitted
Property, Plant and Equipment [Line Items]
Remaining highly probable airspace	0
Buttonwillow | California
Property, Plant and Equipment [Line Items]
Remaining lives (years)	22 years
Remaining highly probable airspace	7,379,000
Buttonwillow | California | Permitted
Property, Plant and Equipment [Line Items]
Remaining highly probable airspace	7,379,000
Buttonwillow | California | Unpermitted
Property, Plant and Equipment [Line Items]
Remaining highly probable airspace	0
Deer Park | Texas
Property, Plant and Equipment [Line Items]
Remaining lives (years)	8 years
Remaining highly probable airspace	305,000
Deer Park | Texas | Permitted
Property, Plant and Equipment [Line Items]
Remaining highly probable airspace	305,000
Deer Park | Texas | Unpermitted
Property, Plant and Equipment [Line Items]
Remaining highly probable airspace	0
Deer Trail | Colorado
Property, Plant and Equipment [Line Items]
Remaining lives (years)	29 years
Remaining highly probable airspace	1,994,000
Deer Trail | Colorado | Permitted
Property, Plant and Equipment [Line Items]
Remaining highly probable airspace	1,994,000
Deer Trail | Colorado | Unpermitted
Property, Plant and Equipment [Line Items]
Remaining highly probable airspace	0
Grassy Mountain | Utah
Property, Plant and Equipment [Line Items]
Remaining lives (years)	17 years
Remaining highly probable airspace	1,921,000
Grassy Mountain | Utah | Permitted
Property, Plant and Equipment [Line Items]
Remaining highly probable airspace	1,921,000
Grassy Mountain | Utah | Unpermitted
Property, Plant and Equipment [Line Items]
Remaining highly probable airspace	0
Kimball | Nebraska
Property, Plant and Equipment [Line Items]
Remaining lives (years)	20 years
Remaining highly probable airspace	268,000
Kimball | Nebraska | Permitted
Property, Plant and Equipment [Line Items]
Remaining highly probable airspace	268,000
Kimball | Nebraska | Unpermitted
Property, Plant and Equipment [Line Items]
Remaining highly probable airspace	0
Lambton | Ontario
Property, Plant and Equipment [Line Items]
Remaining lives (years)	38 years
Remaining highly probable airspace	4,762,000
Lambton | Ontario | Permitted
Property, Plant and Equipment [Line Items]
Remaining highly probable airspace	54,000
Lambton | Ontario | Unpermitted
Property, Plant and Equipment [Line Items]
Remaining highly probable airspace	4,708,000
Lone Mountain | Oklahoma
Property, Plant and Equipment [Line Items]
Remaining lives (years)	33 years
Remaining highly probable airspace	4,951,000
Lone Mountain | Oklahoma | Permitted
Property, Plant and Equipment [Line Items]
Remaining highly probable airspace	2,301,000
Lone Mountain | Oklahoma | Unpermitted
Property, Plant and Equipment [Line Items]
Remaining highly probable airspace	2,650,000
Ryley | Alberta
Property, Plant and Equipment [Line Items]
Remaining lives (years)	9 years
Remaining highly probable airspace	1,615,000
Ryley | Alberta | Permitted
Property, Plant and Equipment [Line Items]
Remaining highly probable airspace	735,000
Ryley | Alberta | Unpermitted
Property, Plant and Equipment [Line Items]
Remaining highly probable airspace	880,000
Sawyer | North Dakota
Property, Plant and Equipment [Line Items]
Remaining lives (years)	14 years
Remaining highly probable airspace	3,783,000
Sawyer | North Dakota | Permitted
Property, Plant and Equipment [Line Items]
Remaining highly probable airspace	3,783,000
Sawyer | North Dakota | Unpermitted
Property, Plant and Equipment [Line Items]
Remaining highly probable airspace	0
Westmorland | California
Property, Plant and Equipment [Line Items]
Remaining lives (years)	64 years
Remaining highly probable airspace	2,732,000
Westmorland | California | Permitted
Property, Plant and Equipment [Line Items]
Remaining highly probable airspace	2,732,000
Westmorland | California | Unpermitted
Property, Plant and Equipment [Line Items]
Remaining highly probable airspace	0