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Segment Information - Summary of Reconciliation Operating Income to EBITDA (Parenthetical) (Detail) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2020
Mar. 31, 2020
Jun. 30, 2019
Sep. 30, 2020
Dec. 31, 2019
APi Acquisition [Member]          
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]          
Depreciation expense would have been higher , if fair value known at business acquisition amount   $ 2     $ 2
Safety Services [Member]          
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]          
Cumulative adjustment to depreciation expense       $ (2)  
Cumulative adjustment to amortization expense $ 8     8  
Safety Services [Member] | APi Acquisition [Member]          
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]          
Depreciation expense would have been higher , if fair value known at business acquisition amount   (1)     (1)
Amortization expense would have been higher , if fair value known at business acquisition amount   3 $ 2   3
Specialty Services [Member]          
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]          
Cumulative adjustment to depreciation expense       5  
Cumulative adjustment to amortization expense (9)     (9)  
Specialty Services [Member] | APi Acquisition [Member]          
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]          
Depreciation expense would have been higher , if fair value known at business acquisition amount   3     2
Amortization expense would have been higher , if fair value known at business acquisition amount   (3) (3)   (3)
Industrial Services [Member]          
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]          
Cumulative adjustment to depreciation expense       3  
Cumulative adjustment to amortization expense $ (14)     (14)  
Industrial Services [Member] | APi Acquisition [Member]          
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]          
Depreciation expense would have been higher , if fair value known at business acquisition amount   1     2
Amortization expense would have been higher , if fair value known at business acquisition amount   (5) $ (4)   (5)
Corporate and Eliminations [Member]          
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]          
Cumulative adjustment to depreciation expense       $ (2)  
Corporate and Eliminations [Member] | APi Acquisition [Member]          
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]          
Depreciation expense would have been higher , if fair value known at business acquisition amount   $ (1)     $ (1)