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CONTINGENCIES AND COMMITMENTS (Detail) - USD ($)
1 Months Ended 12 Months Ended
Nov. 30, 2019
Dec. 31, 2019
Dec. 31, 2018
Loss Contingencies [Line Items]      
Litigation Settlement, Amount Awarded to Other Party $ 38,000,000    
Payments for Legal Settlements $ 6,000,000    
Asset Retirement Obligation   $ 7,500,000  
Surety Bond Outstanding   45,600,000  
Standby letters of credit      
Loss Contingencies [Line Items]      
Letters of credit   32,600,000 $ 21,700,000
Financial Standby Letter of Credit [Member]      
Loss Contingencies [Line Items]      
Letters of credit   10,800,000 $ 11,700,000
Failure to Meet Contractual Obligations [Member]      
Loss Contingencies [Line Items]      
Loss Contingency, Damages Sought, Value   25,000,000  
Minimum | Failure to Meet Contractual Obligations [Member]      
Loss Contingencies [Line Items]      
Loss Contingency, Range of Possible Loss   0  
Maximum | Failure to Meet Contractual Obligations [Member]      
Loss Contingencies [Line Items]      
Loss Contingency, Range of Possible Loss   55,500,000  
AP1000 US [Member] | Minimum      
Loss Contingencies [Line Items]      
Loss Contingency, Range of Possible Loss   0  
AP1000 US [Member] | Maximum      
Loss Contingencies [Line Items]      
Loss Contingency, Range of Possible Loss   $ 31,000,000