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Basis of Presentation and Significant Accounting Policies - Additional Information (Detail)
$ in Thousands
 12 Months Ended
May 29, 2020
USD ($)
Dec. 31, 2021
USD ($)
facility
segment
component
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Basis Of Presentation And Significant Accounting Policies [Line Items]        
Number of reportable segments | segment   3    
Number of large, heavy components supplied to worldwide (more than) | component   1,300    
Research and development activities   $ 31,400 $ 40,800 $ 66,900
Research and development activities, paid by customers   20,300 26,600 49,200
Interest expense   51,100 40,800 41,400
Interest costs capitalized   15,300 9,800 6,100
Restricted cash and cash equivalents reclassified into other assets   5,900    
Restricted cash and cash equivalents   2,896 3,070  
Total inventories   16,300 15,000  
Depreciation   58,100 50,300 51,000
Lease expense   8,400 7,700 8,100
Cash payments for leases   $ 6,700    
Weighted average remaining lease term   6 years 8 months 12 days    
Weighted average discount rate   4.19%    
Number of facilities with U.S. Government decommissioning costs obligation | facility   2    
Reserves for self-insurance   $ 4,500 5,000  
Net foreign currency transaction gains (losses)   1,800 (600) 1,000
Net gains deferred on derivative financial instruments in accumulated other comprehensive income (loss)   (700)    
Gains recognized in other-net associated with derivative financial instruments   (100) 8,700 $ (1,000)
Notional amount of foreign currency forward contracts   352,200    
Favorable operating lease        
Basis Of Presentation And Significant Accounting Policies [Line Items]        
Amortization   1,700    
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   $ 5,400 $ 20,400  
Minimum        
Basis Of Presentation And Significant Accounting Policies [Line Items]        
Operating lease contract term   1 year    
Operating lease renewal contract term   1 year    
Minimum | Machinery and equipment        
Basis Of Presentation And Significant Accounting Policies [Line Items]        
Useful life   3 years    
Minimum | Property, Plant and Equipment        
Basis Of Presentation And Significant Accounting Policies [Line Items]        
Useful life   8 years    
Maximum        
Basis Of Presentation And Significant Accounting Policies [Line Items]        
Operating lease contract term   20 years    
Operating lease renewal contract term   10 years    
Maximum | Machinery and equipment        
Basis Of Presentation And Significant Accounting Policies [Line Items]        
Useful life   14 years    
Maximum | Property, Plant and Equipment        
Basis Of Presentation And Significant Accounting Policies [Line Items]        
Useful life   40 years    
Cash Held For Decommissioning Of Facilities        
Basis Of Presentation And Significant Accounting Policies [Line Items]        
Restricted cash and cash equivalents   $ 3,000    
Cash Held To Meet Reinsurance Reserve Requirements        
Basis Of Presentation And Significant Accounting Policies [Line Items]        
Restricted cash and cash equivalents   $ 2,900