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CLOSURE AND POST-CLOSURE LIABILITIES (Tables)
 12 Months Ended
Dec. 31, 2013
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, 2012 through December 31, 2013 were as follows (in thousands):
 
Landfill
Retirement
Liability
 
Non-Landfill
Retirement
Liability
 
Total
Balance at January 1, 2012
$
25,764

 
$
9,117

 
$
34,881

Liabilities assumed in Safety-Kleen acquisition
—

 
7,553

 
7,553

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

 
10

 
85

Balance at December 31, 2012 (As Adjusted)
26,658

 
17,389

 
44,047

Liabilities assumed in Evergreen acquisition
—

 
659

 
659

New asset retirement obligations
4,515

 
—

 
4,515

Accretion
3,016

 
1,730

 
4,746

Changes in estimates recorded to statement of income
(409
)
 
47

 
(362
)
Changes in estimates recorded to balance sheet
(1,697
)
 
181

 
(1,516
)
Expenditures
(4,175
)
 
(347
)
 
(4,522
)
Currency translation and other
(304
)
 
(178
)
 
(482
)
Balance at December 31, 2013
$
27,604

 
$
19,481

 
$
47,085
Schedule of Expected Payments Related to Asset Retirement Obligations
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,
 
2014
$
7,017

2015
8,607

2016
6,860

2017
4,526

2018
8,164

Thereafter
259,837

Undiscounted closure and post-closure liabilities
295,011

Less: Discount at credit-adjusted risk-free rate
(160,091
)
Less: Undiscounted estimated closure and post-closure liabilities relating to airspace not yet consumed
(87,835
)
Present value of closure and post-closure liabilities
$
47,085