PROPERTY, PLANT AND EQUIPMENT (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2014	Dec. 31, 2013
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 2,538,611	$ 2,417,364
Less - accumulated depreciation and amortization	927,313	815,194
Total property, plant and equipment, net	1,611,298	1,602,170
Land
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	100,194	99,794
Asset retirement costs (non-landfill)
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	10,936	10,938
Landfill assets
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	105,569	100,983
Buildings and improvements
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	333,930	327,956
Camp equipment
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	186,622	187,831
Vehicles
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	459,594	425,296
Equipment
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	1,272,036	1,201,296
Furniture and fixtures
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	5,471	5,260
Construction in progress
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 64,259	$ 58,010