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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, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Dec. 31, 2019
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]          
Net revenues $ 958 $ 1,118 $ 2,705 $ 3,107  
EBITDA Reconciliation          
Operating income (loss) 62 13 (145) 102  
Plus:          
Investment income and other, net 6 8 20 11  
Depreciation 21 19 62 52  
Amortization 31 8 134 26  
EBITDA 120 48 71 191  
Total assets 3,826 2,315 3,826 2,315 $ 4,011
Capital expenditures 7 13 24 53  
Safety Services [Member]          
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]          
Net revenues 404 472 1,199 1,342  
EBITDA Reconciliation          
Operating income (loss) (24) 56 (12) 161  
Plus:          
Investment income and other, net 4   9 1  
Depreciation 2 1 4 4  
Amortization 35 1 83 4  
EBITDA 17 58 84 170  
Total assets 1,702 812 1,702 812  
Capital expenditures 0 0 1 4  
Specialty Services [Member]          
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]          
Net revenues 400 407 1,049 1,107  
EBITDA Reconciliation          
Operating income (loss) 105 32 (9) 60  
Plus:          
Investment income and other, net 5 6 13 7  
Depreciation 11 10 35 28  
Amortization 5 5 41 16  
EBITDA 126 53 80 111  
Total assets 1,105 882 1,105 882  
Capital expenditures 5 7 14 27  
Industrial Services [Member]          
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]          
Net revenues 158 245 468 670  
EBITDA Reconciliation          
Operating income (loss) 17 6 (37)    
Plus:          
Investment income and other, net   1   1  
Depreciation 6 6 19 14  
Amortization (10) 2 7 6  
EBITDA 13 15 (11) 21  
Total assets 341 394 341 394  
Capital expenditures 2 5 8 21  
Corporate and Eliminations [Member]          
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]          
Net revenues (4) (6) (11) (12)  
EBITDA Reconciliation          
Operating income (loss) (36) (81) (87) (119)  
Plus:          
Investment income and other, net (3) 1 (2) 2  
Depreciation 2 2 4 6  
Amortization 1   3    
EBITDA (36) (78) (82) (111)  
Total assets $ 678 227 678 227  
Capital expenditures   $ 1 $ 1 $ 1