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CONTINGENCIES AND COMMITMENTS (Detail) - USD ($)	6 Months Ended
CONTINGENCIES AND COMMITMENTS (Detail) - USD ($)	Jun. 30, 2021	Dec. 31, 2020
Standby Letters Of Credit [Member]
Loss Contingencies [Line Items]
Letters of credit, outstanding	$ 23,400,000	$ 21,100,000
FinancialStandbyLetterOfCreditMember
Loss Contingencies [Line Items]
Letters of credit, outstanding	4,700,000	$ 5,600,000
Surety Bond [Member]
Loss Contingencies [Line Items]
Surety Bond Outstanding	45,600,000
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
AP1000 China
Loss Contingencies [Line Items]
Damages sought	25,000,000
AP1000 China \| Minimum [Member]
Loss Contingencies [Line Items]
Range of possible loss	0
AP1000 China \| Maximum [Member]
Loss Contingencies [Line Items]
Range of possible loss	$ 25,000,000