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CONTINGENCIES AND COMMITMENTS (Detail) - USD ($)	Oct. 10, 2013	Sep. 30, 2020	Dec. 31, 2019
Standby Letters Of Credit [Member]
Loss Contingencies [Line Items]
Letters of credit, outstanding		$ 21,900,000	$ 32,600,000
FinancialStandbyLetterOfCreditMember
Loss Contingencies [Line Items]
Letters of credit, outstanding		6,600,000	$ 10,800,000
Failure to Meet Contractual Obligations [Member]
Loss Contingencies [Line Items]
Damages sought	$ 25,000,000
Surety Bond [Member]
Loss Contingencies [Line Items]
Surety Bond Outstanding		45,600,000
Minimum [Member]
Loss Contingencies [Line Items]
Range of possible loss		0
Maximum [Member]
Loss Contingencies [Line Items]
Range of possible loss		55,500,000
AP1000 US [Member] \| Minimum [Member]
Loss Contingencies [Line Items]
Range of possible loss		0
AP1000 US [Member] \| Maximum [Member]
Loss Contingencies [Line Items]
Range of possible loss		$ 31,000,000