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Basis of Presentation and Significant Accounting Policies - Additional Information (Detail)
$ in Thousands
 12 Months Ended
May 29, 2020
USD ($)
Dec. 31, 2022
USD ($)
facility
segment
component
Dec. 31, 2021
USD ($)
segment
Dec. 31, 2020
USD ($)
Basis Of Presentation And Significant Accounting Policies [Line Items]        
Number of reportable segments | segment   2 3  
Number of large, heavy components supplied to worldwide (more than) | component   1,300    
Research and development activities   $ 45,400 $ 31,400 $ 40,800
Research and development activities, paid by customers   35,900 20,300 26,600
Interest expense   53,900 51,100 40,800
Interest costs capitalized   17,500 15,300 9,800
Restricted cash and cash equivalents reclassified into other assets   5,700    
Restricted cash and cash equivalents   2,928 2,896  
Total inventories   22,900 16,300  
Depreciation   61,300 58,100 50,300
Lease expense   8,600 8,400 7,700
Cash payments for leases   $ 6,600    
Weighted average remaining lease term   13 years 10 months 24 days    
Weighted average discount rate   4.72%    
Asset retirement costs, estimated maximum duration   40 years    
Number of facilities with U.S. Government decommissioning costs obligation | facility   2    
Reserves for self-insurance   $ 4,200 4,500  
Net foreign currency transaction gains (losses)   (1,400) 1,800 (600)
Net gains deferred on derivative financial instruments in accumulated other comprehensive income (loss)   100    
Gain (loss) on foreign currency derivative instruments not designated as hedging instruments   (27,100) (100) 8,700
Notional amount of foreign currency forward contracts   438,800    
Favorable operating lease        
Basis Of Presentation And Significant Accounting Policies [Line Items]        
Amortization   1,600    
Nuclear Services Business        
Basis Of Presentation And Significant Accounting Policies [Line Items]        
Net assets exchanged in noncash transaction $ 18,000      
Accounts Receivable        
Basis Of Presentation And Significant Accounting Policies [Line Items]        
Canada Emergency Wage Subsidy (CEWS) grant   $ 600 $ 5,400 $ 20,400
Minimum        
Basis Of Presentation And Significant Accounting Policies [Line Items]        
Operating lease contract term (in years)   1 year    
Operating lease renewal contract term (in years)   1 year    
Minimum | Machinery and equipment        
Basis Of Presentation And Significant Accounting Policies [Line Items]        
Useful life (in years)   3 years    
Minimum | Property, Plant and Equipment        
Basis Of Presentation And Significant Accounting Policies [Line Items]        
Useful life (in years)   8 years    
Maximum        
Basis Of Presentation And Significant Accounting Policies [Line Items]        
Operating lease contract term (in years)   20 years    
Operating lease renewal contract term (in years)   10 years    
Maximum | Machinery and equipment        
Basis Of Presentation And Significant Accounting Policies [Line Items]        
Useful life (in years)   14 years    
Maximum | Property, Plant and Equipment        
Basis Of Presentation And Significant Accounting Policies [Line Items]        
Useful life (in years)   40 years    
Cash Held For Decommissioning Of Facilities        
Basis Of Presentation And Significant Accounting Policies [Line Items]        
Restricted cash and cash equivalents   $ 2,800    
Cash Held To Meet Reinsurance Reserve Requirements        
Basis Of Presentation And Significant Accounting Policies [Line Items]        
Restricted cash and cash equivalents   $ 2,900