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BASIS OF PRESENTATION (Details)
1 Months Ended 3 Months Ended 12 Months Ended
Oct. 05, 2018
USD ($)
Sep. 17, 2018
USD ($)
contract
Apr. 30, 2018
USD ($)
Sep. 30, 2018
USD ($)
Jul. 31, 2018
USD ($)
Jun. 30, 2018
USD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Mar. 20, 2019
USD ($)
Jun. 05, 2018
USD ($)
Mar. 31, 2018
USD ($)
Debt Instrument [Line Items]                        
Proceeds from rights offering     $ 248,400,000       $ 247,132,000 $ 0 $ 0      
Proceeds from sale of businesses, net of cash sold             155,016,000 $ 0 $ 0      
Expected annual savings on restructuring           $ 84,000,000            
Amended Credit Agreement                        
Debt Instrument [Line Items]                        
Allowable last-out loans             $ 30,000,000.0          
Last out term loan | Affiliated Entity                        
Debt Instrument [Line Items]                        
Borrowings under credit facilities       $ 30,000,000                
BWBC                        
Debt Instrument [Line Items]                        
Proceeds from sale of equity method investments           $ 21,100,000            
TBWES                        
Debt Instrument [Line Items]                        
Proceeds from sale of equity method investments         $ 15,000,000              
Palm Beach Resource Recovery Corporation                        
Debt Instrument [Line Items]                        
Discontinued operation, consideration transferred   $ 45,000,000                    
Proceeds from sale of businesses, net of cash sold   38,900,000                    
Proceeds from sale of business, escrow portion   $ 4,900,000                    
Palm Beach Resource Recovery Corporation                        
Debt Instrument [Line Items]                        
Number of contracts held | contract   2                    
Discontinued Operations, Held-for-sale | MEGTEC and Universal Businesses                        
Debt Instrument [Line Items]                        
Discontinued operation, consideration transferred $ 130,000,000                   $ 130,000,000  
Proceeds from sale of businesses, net of cash sold 112,000,000                      
Cash sold with the businesses 22,500,000                      
Consideration, escrow amount $ 7,700,000                      
Discontinued Operations                        
Debt Instrument [Line Items]                        
Discontinued operation, consideration transferred                       $ 5,100,000
Subsequent Event | Amended Credit Agreement | B. Riley Financial, Inc.                        
Debt Instrument [Line Items]                        
Allowable last-out loans                   $ 10,000,000.0