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Segment Reporting - Schedule of Revenue Information from Products and Service Lines (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2022
Sep. 30, 2022
Jun. 30, 2022
Mar. 31, 2022
Dec. 31, 2021
Sep. 30, 2021
Jun. 30, 2021
Mar. 31, 2021
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Revenue from External Customer [Line Items]                      
Revenues $ 624,177 $ 523,711 $ 554,208 $ 530,738 $ 591,975 $ 498,727 $ 505,099 $ 528,273 $ 2,232,834 $ 2,124,074 $ 2,123,516
Government Operations                      
Revenue from External Customer [Line Items]                      
Revenues                 1,808,483 1,725,097 1,763,127
Commercial Operations                      
Revenue from External Customer [Line Items]                      
Revenues                 427,358 407,082 371,269
Reportable Segments                      
Revenue from External Customer [Line Items]                      
Revenues                 2,235,841 2,132,179 2,134,396
Reportable Segments | Government Operations                      
Revenue from External Customer [Line Items]                      
Revenues                 1,808,483 1,725,097 1,763,127
Reportable Segments | Government Operations | Nuclear Components and Fuel                      
Revenue from External Customer [Line Items]                      
Revenues                 1,494,810 1,481,416 1,512,980
Reportable Segments | Government Operations | Downblending and Nuclear Services                      
Revenue from External Customer [Line Items]                      
Revenues                 233,197 198,420 207,221
Reportable Segments | Government Operations | Advanced Reactor Design and Engineering                      
Revenue from External Customer [Line Items]                      
Revenues                 80,476 45,261 42,926
Reportable Segments | Commercial Operations                      
Revenue from External Customer [Line Items]                      
Revenues                 427,358 407,082 371,269
Reportable Segments | Commercial Operations | Nuclear Manufacturing                      
Revenue from External Customer [Line Items]                      
Revenues                 221,458 246,444 250,585
Reportable Segments | Commercial Operations | Nuclear Services and Engineering                      
Revenue from External Customer [Line Items]                      
Revenues                 205,900 160,638 120,684
Other                      
Revenue from External Customer [Line Items]                      
Revenues                 $ (3,007) $ (8,105) $ (10,880)