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Basis of Presentation and Significant Accounting Policies - Additional Information (Detail)
$ in Thousands
 12 Months Ended
May 29, 2020
USD ($)
Dec. 31, 2020
USD ($)
component
segment
facilities
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
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   $ 40,800 $ 66,900 $ 63,400
Research and development activities, paid by customers   26,600 49,200 48,200
Interest expense   40,800 41,400 31,500
Interest costs capitalized   9,800 6,100 3,700
Restricted cash and cash equivalents reclassified into other assets   5,700    
Restricted cash and cash equivalents   3,070 3,056  
Total inventories   15,000 17,100  
Depreciation   50,300 51,000 48,600
Lease expense   7,700 8,100 6,200
Cash payments for leases   $ 6,200    
Weighted average remaining lease term   5 years 7 months 6 days    
Weighted average discount rate   4.64%    
Operating lease, right-of-use asset   $ 41,300    
Number of facilities with U.S. Government decommissioning costs obligation | facilities   2    
Reserves for self-insurance   $ 5,000 5,200  
Net foreign currency transaction gains (losses)   (600) 1,000 2,000
Net gains deferred on derivative financial instruments in accumulated other comprehensive income (loss)   (500)    
Gains recognized in other-net associated with derivative financial instruments   8,700 $ (1,000) $ (4,700)
Notional amount of foreign currency forward contracts   $ 245,300    
Operating Lease, Liability, Current, Statement of Financial Position [Extensible List]   us-gaap:AccountsPayableAndAccruedLiabilitiesCurrent us-gaap:AccountsPayableAndAccruedLiabilitiesCurrent  
Operating Lease, Liability, Noncurrent, Statement of Financial Position [Extensible List]   us-gaap:OtherLiabilitiesNoncurrent us-gaap:OtherLiabilitiesNoncurrent  
Favorable operating lease        
Basis Of Presentation And Significant Accounting Policies [Line Items]        
Amortization   $ 1,500    
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   $ 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   $ 2,600    
Cash Held To Meet Reinsurance Reserve Requirements        
Basis Of Presentation And Significant Accounting Policies [Line Items]        
Restricted cash and cash equivalents   $ 3,100