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CONTINGENCIES AND COMMITMENTS (Detail) - USD ($)
1 Months Ended 3 Months Ended
Oct. 10, 2013
Oct. 31, 2017
Mar. 31, 2019
Dec. 31, 2018
Loss Contingencies [Line Items]        
Surety Bond Outstanding     $ 45,600,000  
Damages sought     1,000,000,000  
Malpractice Loss Contingency, Claims Incurred in Period   $ 400,000,000    
Failure to Meet Contractual Obligations [Member]        
Loss Contingencies [Line Items]        
Damages sought $ 25,000,000      
Standby Letters Of Credit [Member]        
Loss Contingencies [Line Items]        
Letters of credit, outstanding     24,000,000 $ 21,700,000
FinancialStandbyLetterOfCreditMember        
Loss Contingencies [Line Items]        
Letters of credit, outstanding     11,100,000 11,700,000
Minimum        
Loss Contingencies [Line Items]        
Range of possible loss, maximum     0  
Maximum        
Loss Contingencies [Line Items]        
Range of possible loss, maximum     55,500,000  
AP1000 US [Member] | Minimum        
Loss Contingencies [Line Items]        
Range of possible loss, maximum       $ 0
AP1000 US [Member] | Maximum        
Loss Contingencies [Line Items]        
Range of possible loss, maximum     $ 31,000,000