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Segment Information - Summary of Reconciliation Operating Income to EBITDA (Detail) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Dec. 31, 2020
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]          
Net revenues $ 1,047 $ 958 $ 2,828 $ 2,705  
EBITDA Reconciliation          
Operating income (loss) 41 62 86 (145)  
Plus:          
Investment income and other, net 3 6 12 20  
Loss on extinguishment of debt     (9)  
Depreciation 20 21 59 62  
Amortization 32 31 95 134  
EBITDA 96 120 243 71  
Total assets 4,783 3,826 4,783 3,826 $ 4,065
Capital expenditures 9 7 43 24  
Safety Services [Member]          
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]          
Net revenues 533 404 1,511 1,199  
EBITDA Reconciliation          
Operating income (loss) 56 (24) 153 (12)  
Plus:          
Investment income and other, net   4 5 9  
Depreciation 3 2 6 4  
Amortization 16 35 49 83  
EBITDA 75 17 213 84  
Total assets 3,108 1,702 3,108 1,702  
Capital expenditures 3   5 1  
Specialty Services [Member]          
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]          
Net revenues 436 400 1,172 1,049  
EBITDA Reconciliation          
Operating income (loss) 31 105 60 (9)  
Plus:          
Investment income and other, net 3 5 5 13  
Depreciation 11 11 32 35  
Amortization 11 5 34 41  
EBITDA 56 126 131 80  
Total assets 1,284 1,105 1,284 1,105  
Capital expenditures 4 5 25 14  
Industrial Services [Member]          
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]          
Net revenues 103 158 196 468  
EBITDA Reconciliation          
Operating income (loss)   17 (23) (37)  
Plus:          
Investment income and other, net 1   3    
Depreciation 5 6 17 19  
Amortization 3 (10) 9 7  
EBITDA 9 13 6 (11)  
Total assets 198 341 198 341  
Capital expenditures 2 2 13 8  
Corporate and Eliminations [Member]          
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]          
Net revenues (25) (4) (51) (11)  
EBITDA Reconciliation          
Operating income (loss) (46) (36) (104) (87)  
Plus:          
Investment income and other, net (1) (3) (1) (2)  
Loss on extinguishment of debt     (9)    
Depreciation 1 2 4 4  
Amortization 2 1 3 3  
EBITDA (44) (36) (107) (82)  
Total assets 193 $ 678 $ 193 678  
Capital expenditures     $ 1