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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Detail) (USD $)
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Finite Lived Intangible Assets [Line Items]      
Indefinite Lived Intangible Assets $ 9,900,000    
ImpairedLongLivedAssetsHeldAndUsedLineItems      
Impairment of assets 4,988,000 0 0
Other Current Assets Capitalized Costs 3,000,000 300,000  
Accrual For Environmental Loss Contingencies Current Value Of Anticipated Remediation Costs 25.90%    
ForeignCurrencyTransactionGainLossRealized (2,300,000) (800,000) (4,200,000)
GainLossOnForeignCurrencyDerivativesRecordedInEarningsNet 900,000 (700,000) 3,100,000
Facilities Impaired [Member]
     
ImpairedLongLivedAssetsHeldAndUsedLineItems      
Impairment of assets 5,000,000 200,000 1,500,000
MaximumMember
     
Finite Lived Intangible Assets [Line Items]      
Finite Lived Intangible Assets Useful Life Maximum 20 years 0 months    
MaximumMember | BuildingMember
     
PropertyPlantAndEquipmentLineItems      
PropertyPlantAndEquipmentUsefulLife 40 years 0 months    
MaximumMember | MachineryAndEquipmentMember
     
PropertyPlantAndEquipmentLineItems      
PropertyPlantAndEquipmentUsefulLife 15 years 0 months    
MinimumMember
     
Finite Lived Intangible Assets [Line Items]      
Finite Lived Intangible Assets Useful Life Maximum 1 year 0 months    
MinimumMember | BuildingMember
     
PropertyPlantAndEquipmentLineItems      
PropertyPlantAndEquipmentUsefulLife 5 years 0 months    
MinimumMember | MachineryAndEquipmentMember
     
PropertyPlantAndEquipmentLineItems      
PropertyPlantAndEquipmentUsefulLife 3 years 0 months    
AP1000 [Member]
     
Revenue Recognition [Line Items]      
Changes In Contract Estimates Leading Decrease In Earnings From Continuing Operations 23,700,000 9,700,000 11,400,000
Technology Transfer Contract [Member]
     
Revenue Recognition [Line Items]      
Changes In Contract Estimates Leading Increase In Earnings From Continuing Operations $ 14,200,000