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Basis of Presentation and Significant Accounting Policies - Changes in Carrying Amount of Intangible Assets (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Balance at beginning of period $ 185,551 $ 192,751 $ 191,392
Acquisitions (Note 2) 28,500 0 8,180
Amortization expense (10,901) (9,329) (8,824)
Translation and other (9,538) 2,129 2,003
Balance at end of period $ 193,612 $ 185,551 192,751
Nuclear Services Group      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Translation and other     $ (600)