XML 61 R47.htm IDEA: XBRL DOCUMENT v3.22.0.1
Basis of Presentation and Significant Accounting Policies - Changes in Carrying Amount of Intangible Assets (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Balance at beginning of period $ 192,751 $ 191,392 $ 228,676
Acquisitions (Note 2) 0 8,180 0
Amortization expense (9,329) (8,824) (9,128)
Reclassification of right-of-use assets 0 0 (33,866)
Translation and other 2,129 2,003 5,710
Balance at end of period 185,551 $ 192,751 $ 191,392
Nuclear Services Group      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Translation and other $ (600)