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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)

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