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v3.21.2

Net Revenues - Summary of Disaggregated Net Revenues (Detail) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Disaggregation of Revenue [Line Items] |  |  |  |
Net revenues | $ 1,047 | $ 958 | $ 2,828 | $ 2,705
United States [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net revenues | 955 | 901 | 2,550 | 2,557
Canada and Europe [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net revenues | 92 | 57 | 278 | 148
Safety Services [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net revenues | 533 | 404 | 1,511 | 1,199
Safety Services [Member] | United States [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net revenues | 452 | 361 | 1,257 | 1,074
Safety Services [Member] | Canada and Europe [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net revenues | 81 | 43 | 254 | 125
Specialty Services [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net revenues | 436 | 400 | 1,172 | 1,049
Specialty Services [Member] | United States [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net revenues | 436 | 400 | 1,172 | 1,049
Industrial Services [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net revenues | 103 | 158 | 196 | 468
Industrial Services [Member] | United States [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net revenues | 92 | 144 | 172 | 445
Industrial Services [Member] | Canada and Europe [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net revenues | 11 | 14 | 24 | 23
Corporate and Eliminations [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net revenues | (25) | (4) | (51) | (11)
Corporate and Eliminations [Member] | United States [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net revenues | (25) | (4) | (51) | (11)
Life Safety [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net revenues | 428 | 322 | 1,199 | 963
Life Safety [Member] | Safety Services [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net revenues | 428 | 322 | 1,199 | 963
Heating, Ventilation and Air Conditioning ("HVAC") [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net revenues | 105 | 82 | 312 | 236
Heating, Ventilation and Air Conditioning ("HVAC") [Member] | Safety Services [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net revenues | 105 | 82 | 312 | 236
Infrastructure/Utility [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net revenues | 220 | 230 | 561 | 615
Infrastructure/Utility [Member] | Specialty Services [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net revenues | 220 | 230 | 561 | 615
Fabrication [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net revenues | 45 | 58 | 186 | 129
Fabrication [Member] | Specialty Services [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net revenues | 45 | 58 | 186 | 129
Specialty Contracting [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net revenues | 171 | 112 | 425 | 305
Specialty Contracting [Member] | Specialty Services [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net revenues | 171 | 112 | 425 | 305
Transmission [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net revenues | 68 | 127 | 141 | 336
Transmission [Member] | Industrial Services [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net revenues | 68 | 127 | 141 | 336
Civil [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net revenues | 35 | 25 | 55 | 50
Civil [Member] | Industrial Services [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net revenues | 35 | 25 | 55 | 50
Inspection [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net revenues |  | 6 |  | 82
Inspection [Member] | Industrial Services [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net revenues |  | 6 |  | 82
Corporate and Eliminations [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net revenues | (25) | (4) | (51) | (11)
Corporate and Eliminations [Member] | Corporate and Eliminations [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net revenues | $ (25) | $ (4) | $ (51) | $ (11)

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