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BUSINESS COMBINATIONS (Tables)
 12 Months Ended
Dec. 31, 2013
Evergreen Oil, Inc.
  
Business Acquisition [Line Items]  
Summary of recognized amounts of identifiable assets acquired and liabilities assumed
The following table summarizes the recognized amounts of assets acquired and liabilities assumed at September 13, 2013 (in thousands):
 
Preliminary Allocations
 
Measurement Period Adjustments
 
Allocations as of December 31, 2013
Inventories and supplies
$
1,206

 
$
(117
)
 
$
1,089

Prepaid and other current assets
873

 
418

 
1,291

Property, plant and equipment
40,563

 
—

 
40,563

Permits and other intangibles
16,500

 
600

 
17,100

Deferred tax assets, less current portion
—

 
2,368

 
2,368

Other assets
3,607

 
—

 
3,607

Current liabilities
(6,108
)
 
(90
)
 
(6,198
)
Closure and post-closure liabilities
(659
)
 
—

 
(659
)
Remedial liabilities, less current portion
(2,103
)
 
—

 
(2,103
)
Other long-term liabilities
(1,139
)
 
—

 
(1,139
)
Total identifiable net assets
52,740

 
3,179

 
55,919

Goodwill
3,179

 
(3,179
)
 
—

Total
$
55,919

 
$
—

 
$
55,919
Safety-Kleen
  
Business Acquisition [Line Items]  
Summary of recognized amounts of identifiable assets acquired and liabilities assumed
The following table summarizes the recognized amounts of assets acquired and liabilities assumed at December 28, 2012 (in thousands):
 
Preliminary Allocations
 
Measurement Period Adjustments
 
Final Allocations
Inventories and supplies
$
102,339

 
$
5,037

 
$
107,376

Other current assets (i)
152,245

 
3,429

 
155,674

Property, plant and equipment
514,712

 
1,290

 
516,002

Permits and other intangibles
421,400

 
17,227

 
438,627

Other assets
4,985

 
(647
)
 
4,338

Current liabilities
(192,652
)
 
(13,589
)
 
(206,241
)
Closure and post-closure liabilities, less current portion
(15,774
)
 
8,221

 
(7,553
)
Remedial liabilities, less current portion
(38,370
)
 
(9,931
)
 
(48,301
)
Deferred taxes, unrecognized tax benefits and other long-term liabilities
(128,375
)
 
9,044

 
(119,331
)
Total identifiable net assets
820,510

 
20,081

 
840,591

Goodwill (ii)
436,749

 
(14,056
)
 
422,693

Total (iii)
$
1,257,259

 
$
6,025

 
$
1,263,284

_______________________
(i)
The fair value of the assets acquired includes customer receivables with an aggregate fair value of $137.6 million. Combined gross amounts due were $142.7 million.
(ii)
Goodwill represents the excess of the fair value of the net assets acquired over the purchase price. Based on the final purchase price allocations, goodwill of $173.2 million, $174.1 million and $75.4 million has been recorded in the Oil Re-refining and Recycling, SK Environmental Services and Industrial and Field Services segments, respectively, and will not be deductible for tax purposes.
(iii)
The $6.0 million increase in the purchase price in 2013 was due to finalization of the net working capital balance (excluding cash) as of the closing date.
Unaudited pro forma combined summary data
The following unaudited pro forma combined summary financial information presented below gives effect to the following transactions as if they had occurred as of January 1, 2011, and assumes that there were no material, non-recurring pro forma adjustments directly attributable to: (i) the acquisition of Safety-Kleen, (ii) the sale of 6.9 million shares of the Company's common stock, (iii) the issuance of $600.0 million aggregate principal amount of 5.125% senior unsecured notes due 2021, and (iv) the payment of related fees and expenses (in thousands).
 
2012
 
2011
Pro forma combined revenues
$
3,529,592

 
$
3,245,637

Pro forma combined net income
$
125,425

 
$
129,242
Other 2012 Acquisitions
  
Business Acquisition [Line Items]  
Summary of recognized amounts of identifiable assets acquired and liabilities assumed
The following table summarizes the recognized amounts of assets acquired and liabilities assumed.
(in thousands)
Preliminary Allocations
 
Measurement Period Adjustments
 
Final Allocations
Current assets (i)
$
20,270

 
$
117

 
$
20,387

Property, plant and equipment
51,901

 
(8
)
 
51,893

Customer relationships and other intangibles
21,770

 
(1
)
 
21,769

Other assets
53

 
4

 
57

Current liabilities
(5,277
)
 
(22
)
 
(5,299
)
Other liabilities
(5,133
)
 
(79
)
 
(5,212
)
Total identifiable net assets
83,584

 
11

 
83,595

Goodwill (ii)
23,956

 
1,308

 
25,264

Total
$
107,540

 
$
1,319

 
$
108,859

______________________
(i)
The fair value of the financial assets acquired included customer receivables with an aggregate fair value of $13.2 million. Combined gross amounts due were $13.5 million.  
(ii)
Goodwill, which is attributed to expected operating and cross selling synergies, has been assigned to the Industrial and Field Services segment and will not be deductible for tax purposes.
Unaudited pro forma combined summary data
The following unaudited pro forma combined financial data presents information as if the three other 2012 acquisitions had been acquired as of January 1, 2011 and assumes that there were no material, non-recurring pro forma adjustments directly attributable to those acquisitions. The pro forma financial information does not necessarily reflect the actual results that would have been reported had the Company and those three other acquisitions been combined during the periods presented, nor is it necessarily indicative of the future results of operations of the combined companies (in thousands).
 
2012
 
2011
Pro forma combined revenues
$
2,268,621

 
$
2,112,297

Pro forma combined net income
$
130,322

 
$
126,768
Peak Energy Services Ltd.'s ('Peak')
  
Business Acquisition [Line Items]  
Summary of recognized amounts of identifiable assets acquired and liabilities assumed
In 2012, the Company finalized the purchase accounting for the acquisition of Peak. The following table summarizes the amounts of assets acquired and liabilities assumed at June 10, 2011 (in thousands).
 
Final Allocations
Current assets(i)
$
45,222

Property, plant and equipment
151,574

Identifiable intangible assets
12,337

Other assets
8,009

Current liabilities
(28,785
)
Asset retirement obligations
(103
)
Other liabilities
(11,341
)
Total identifiable net assets
176,913

Goodwill(ii)
28,220

Total
$
205,133

____________
(i)
The fair value of the financial assets acquired included customer receivables with a fair value of $33.3 million. The gross amount due was $34.7 million.
(ii)
Goodwill, which is attributable to expected operating and cross-selling synergies, will not be deductible for tax purposes. Goodwill of $12.9 million and $15.3 million has been recorded in the Oil and Gas Field Services and Industrial and Field Services segments, respectively.
2011 Acquisitions
  
Business Acquisition [Line Items]  
Summary of recognized amounts of identifiable assets acquired and liabilities assumed
In 2012, the Company finalized the purchase accounting for the three other 2011 acquisitions. The following table summarizes the recognized amounts of assets acquired and liabilities assumed (in thousands).
 
Final Allocations
Current assets (i)
$
41,551

Property, plant and equipment
62,969

Customer relationships and other intangibles
23,371

Other assets
1,671

Current liabilities
(23,148
)
Asset retirement obligations
(200
)
Other liabilities
(2,419
)
Total identifiable net assets
103,795

Goodwill (ii)
38,339

Total
$
142,134

_______________________
(i)
The fair value of the financial assets acquired included customer receivables with an aggregate fair value of $21.4 million. Combined gross amounts due were $22.1 million.
(ii)
Goodwill of $13.3 million, $11.1 million and $13.9 million has been assigned to the Oil and Gas Field Services, Technical Services and the Industrial and Field Services segments, respectively, and will not be deductible for tax purposes.