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COMMITMENTS AND CONTINGENCIES (Details)
9 Months Ended
Sep. 30, 2021
USD ($)
employee
$ / shares
Mar. 22, 2021
$ / shares
Dec. 31, 2020
USD ($)
employee
Dec. 31, 2018
$ / shares
Loss Contingencies [Line Items]        
Notes receivable related parties current and noncurrent $ 44,000,000   $ 19,300,000  
Number of employees | employee 1,167   1,130  
Approximate amount accrued related to all claims $ 13,600,000   $ 4,100,000  
REV LNG        
Loss Contingencies [Line Items]        
Committed capital contribution 44,000,000   19,300,000  
SJG        
Loss Contingencies [Line Items]        
Approximate amount accrued related to all claims $ 10,300,000   $ 1,200,000  
SJG | Unionized Collective Bargaining Agreements        
Loss Contingencies [Line Items]        
Number of employees with labor union representation | employee 289   303  
Corporate Units | Public Stock Offering        
Loss Contingencies [Line Items]        
Corporate unit, stated value per share (in dollars per share) | $ / shares $ 50 $ 50   $ 50
Parental Guarantee        
Loss Contingencies [Line Items]        
Parental guarantees $ 10,500,000      
Guarantee expiration period 1 year      
ETG Utility Operations        
Loss Contingencies [Line Items]        
Minimum annual fee for long-term asset management agreement $ 4,250,000      
ETG Utility Operations | Unionized Collective Bargaining Agreements        
Loss Contingencies [Line Items]        
Number of employees with labor union representation | employee 163   167