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Basis of Presentation and Significant Accounting Policies - Schedule of Intangible Assets (Detail) - USD ($) $ in Thousands | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
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Schedule Of Amortized And Unamortized Intangible Assets [Line Items] |  |  |
Amortized intangible assets | $ 201,035 | $ 184,270 | $ 181,921
Accumulated amortization | (51,253) | (42,549) | (33,000)
Net amortized intangible assets | 149,782 | 141,721 | 148,921
Technical support agreement |  |  |
Schedule Of Amortized And Unamortized Intangible Assets [Line Items] |  |  |
Amortized intangible assets | 65,069 | 69,781 | 68,785
Accumulated amortization | (12,495) | (10,366) | (7,227)
Customer relationships |  |  |
Schedule Of Amortized And Unamortized Intangible Assets [Line Items] |  |  |
Amortized intangible assets | 56,176 | 40,247 | 39,954
Accumulated amortization | (20,590) | (18,176) | (15,996)
Unpatented technology |  |  |
Schedule Of Amortized And Unamortized Intangible Assets [Line Items] |  |  |
Amortized intangible assets | 39,609 | 38,073 | 37,529
Accumulated amortization | (7,966) | (6,398) | (4,584)
CNSC class 1B nuclear facility license |  |  |
Schedule Of Amortized And Unamortized Intangible Assets [Line Items] |  |  |
Amortized intangible assets | 25,094 | 26,911 | 26,528
Accumulated amortization | (5,052) | (4,521) | (3,573)
Acquired backlog |  |  |
Schedule Of Amortized And Unamortized Intangible Assets [Line Items] |  |  |
Amortized intangible assets | 13,537 | 7,595 | 7,487
Accumulated amortization | (4,474) | (2,531) | (1,248)
Patented technology |  |  |
Schedule Of Amortized And Unamortized Intangible Assets [Line Items] |  |  |
Amortized intangible assets | 738 | 792 | 780
Accumulated amortization | (405) | (363) | (286)
All other |  |  |
Schedule Of Amortized And Unamortized Intangible Assets [Line Items] |  |  |
Amortized intangible assets | 812 | 871 | 858
Accumulated amortization | (271) | (194) | (86)
NRC category 1 license |  |  |
Schedule Of Amortized And Unamortized Intangible Assets [Line Items] |  |  |
Unamortized intangible assets | $ 43,830 | $ 43,830 | $ 43,830

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