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CLOSURE AND POST-CLOSURE LIABILITIES (Tables)
 12 Months Ended
Dec. 31, 2012
Asset Retirement Obligation Disclosure [Abstract]  
Schedule of closure and post-closure liabilities
The changes to closure and post-closure liabilities (also referred to as "asset retirement obligations") from January 1, 2011 through December 31, 2012 were as follows (in thousands):
 
Landfill
Retirement
Liability
 
Non-Landfill
Retirement
Liability
 
Total
Balance at January 1, 2011
$
29,756

 
$
8,923

 
$
38,679

Liabilities assumed in acquisitions
—

 
202

 
202

New asset retirement obligations
2,469

 
—

 
2,469

Accretion
2,255

 
1,126

 
3,381

Changes in estimates recorded to statement of income
(822
)
 
(580
)
 
(1,402
)
Changes in estimates recorded to balance sheet
(4,232
)
 
292

 
(3,940
)
Expenditures
(3,597
)
 
(935
)
 
(4,532
)
Currency translation and other
(65
)
 
89

 
24

Balance at December 31, 2011
25,764

 
9,117

 
34,881

Liabilities assumed in Safety-Kleen acquisition
—

 
17,753

 
17,753

New asset retirement obligations
3,257

 
—

 
3,257

Accretion
2,897

 
1,096

 
3,993

Changes in estimates recorded to statement of income
133

 
1,061

 
1,194

Changes in estimates recorded to balance sheet
(3,086
)
 
15

 
(3,071
)
Expenditures
(2,382
)
 
(1,463
)
 
(3,845
)
Currency translation and other
75

 
11

 
86

Balance at December 31, 2012
$
26,658

 
$
27,590

 
$
54,248
Schedule of Expected Payments Related to Asset Retirement Obligations [Table Text Block]
Anticipated payments (based on current estimated costs and anticipated timing of necessary regulatory approvals to commence work on closure and post-closure activities) for each of the next five years and thereafter are as follows (in thousands):
Year ending December 31,
 
2013
$
9,501

2014
9,830

2015
7,663

2016
5,216

2017
5,850

Thereafter
261,385

Undiscounted closure and post-closure liabilities
299,445

Less: Discount at credit-adjusted risk-free rate
(156,559
)
Less: Undiscounted estimated closure and post-closure liabilities relating to airspace not yet consumed
(88,638
)
Present value of closure and post-closure liabilities
$
54,248