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CONTINGENCIES AND COMMITMENTS (Detail) - USD ($)	Mar. 31, 2021	Dec. 31, 2020
Standby Letters Of Credit [Member]
Loss Contingencies [Line Items]
Letters of credit, outstanding	$ 19,700,000	$ 21,100,000
FinancialStandbyLetterOfCreditMember
Loss Contingencies [Line Items]
Letters of credit, outstanding	5,600,000	$ 5,600,000
Surety Bond [Member]
Loss Contingencies [Line Items]
Surety Bond Outstanding	45,600,000
Minimum [Member]
Loss Contingencies [Line Items]
Range of possible loss	0
Minimum [Member] \| AP1000 US [Member]
Loss Contingencies [Line Items]
Range of possible loss	0
Minimum [Member] \| AP1000 China
Loss Contingencies [Line Items]
Range of possible loss	0
Maximum [Member]
Loss Contingencies [Line Items]
Range of possible loss	55,500,000
Maximum [Member] \| AP1000 US [Member]
Loss Contingencies [Line Items]
Range of possible loss	31,000,000
Maximum [Member] \| AP1000 China
Loss Contingencies [Line Items]
Range of possible loss	$ 25,000,000