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Net Revenues (Tables) | 9 Months Ended
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Sep. 30, 2021
Revenues [Abstract] |
Summary of Disaggregated Net Revenues | The Company disaggregates its net revenues primarily by segment, service type, and country from which revenues are invoiced, as the nature, timing and uncertainty of cash flows are relatively consistent within each of these categories. Disaggregated net revenues information is as follows:
|  | Three Months Ended September 30, 2021 |
|  | Safety Services |  |  | Specialty Services |  |  | Industrial Services |  |  | Corporate and Eliminations |  |  | Consolidated |
Life Safety |  | $ | 428 |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | 428 |
Heating, Ventilation and Air Conditioning ("HVAC") |  |  | 105 |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 105 |
Infrastructure/Utility |  |  | — |  |  |  | 220 |  |  |  | — |  |  |  | — |  |  |  | 220 |
Fabrication |  |  | — |  |  |  | 45 |  |  |  | — |  |  |  | — |  |  |  | 45 |
Specialty Contracting |  |  | — |  |  |  | 171 |  |  |  | — |  |  |  | — |  |  |  | 171 |
Transmission |  |  | — |  |  |  | — |  |  |  | 68 |  |  |  | — |  |  |  | 68 |
Civil |  |  | — |  |  |  | — |  |  |  | 35 |  |  |  | — |  |  |  | 35 |
Corporate and Eliminations |  |  | — |  |  |  | — |  |  |  | — |  |  |  | (25 | ) |  |  | (25 | )
Net revenues |  | $ | 533 |  |  | $ | 436 |  |  | $ | 103 |  |  | $ | (25 | ) |  | $ | 1,047 |
|  | Three Months Ended September 30, 2020 |
|  | Safety Services |  |  | Specialty Services |  |  | Industrial Services |  |  | Corporate and Eliminations |  |  | Consolidated |
Life Safety |  | $ | 322 |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | 322 |
HVAC |  |  | 82 |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 82 |
Infrastructure/Utility |  |  | — |  |  |  | 230 |  |  |  | — |  |  |  | — |  |  |  | 230 |
Fabrication |  |  | — |  |  |  | 58 |  |  |  | — |  |  |  | — |  |  |  | 58 |
Specialty Contracting |  |  | — |  |  |  | 112 |  |  |  | — |  |  |  | — |  |  |  | 112 |
Transmission |  |  | — |  |  |  | — |  |  |  | 127 |  |  |  | — |  |  |  | 127 |
Civil |  |  | — |  |  |  | — |  |  |  | 25 |  |  |  | — |  |  |  | 25 |
Inspection |  |  | — |  |  |  | — |  |  |  | 6 |  |  |  | — |  |  |  | 6 |
Corporate and Eliminations |  |  | — |  |  |  | — |  |  |  | — |  |  |  | (4 | ) |  |  | (4 | )
Net revenues |  | $ | 404 |  |  | $ | 400 |  |  | $ | 158 |  |  | $ | (4 | ) |  | $ | 958 |
|  | Nine Months Ended September 30, 2021 |
|  | Safety Services |  |  | Specialty Services |  |  | Industrial Services |  |  | Corporate and Eliminations |  |  | Consolidated |
Life Safety |  | $ | 1,199 |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | 1,199 |
HVAC |  |  | 312 |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 312 |
Infrastructure/Utility |  |  | — |  |  |  | 561 |  |  |  | — |  |  |  | — |  |  |  | 561 |
Fabrication |  |  | — |  |  |  | 186 |  |  |  | — |  |  |  | — |  |  |  | 186 |
Specialty Contracting |  |  | — |  |  |  | 425 |  |  |  | — |  |  |  | — |  |  |  | 425 |
Transmission |  |  | — |  |  |  | — |  |  |  | 141 |  |  |  | — |  |  |  | 141 |
Civil |  |  | — |  |  |  | — |  |  |  | 55 |  |  |  | — |  |  |  | 55 |
Corporate and Eliminations |  |  | — |  |  |  | — |  |  |  | — |  |  |  | (51 | ) |  |  | (51 | )
Net revenues |  | $ | 1,511 |  |  | $ | 1,172 |  |  | $ | 196 |  |  | $ | (51 | ) |  | $ | 2,828 |
|  | Nine Months Ended September 30, 2020 |
|  | Safety Services |  |  | Specialty Services |  |  | Industrial Services |  |  | Corporate and Eliminations |  |  | Consolidated |
Life Safety |  | $ | 963 |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | 963 |
HVAC |  |  | 236 |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 236 |
Infrastructure/Utility |  |  | — |  |  |  | 615 |  |  |  | — |  |  |  | — |  |  |  | 615 |
Fabrication |  |  | — |  |  |  | 129 |  |  |  | — |  |  |  | — |  |  |  | 129 |
Specialty Contracting |  |  | — |  |  |  | 305 |  |  |  | — |  |  |  | — |  |  |  | 305 |
Transmission |  |  | — |  |  |  | — |  |  |  | 336 |  |  |  | — |  |  |  | 336 |
Civil |  |  | — |  |  |  | — |  |  |  | 50 |  |  |  | — |  |  |  | 50 |
Inspection |  |  | — |  |  |  | — |  |  |  | 82 |  |  |  | — |  |  |  | 82 |
Corporate and Eliminations |  |  | — |  |  |  | — |  |  |  | — |  |  |  | (11 | ) |  |  | (11 | )
Net revenues |  | $ | 1,199 |  |  | $ | 1,049 |  |  | $ | 468 |  |  | $ | (11 | ) |  | $ | 2,705 |
|  | Three Months Ended September 30, 2021 |
|  | Safety Services |  |  | Specialty Services |  |  | Industrial Services |  |  | Corporate and Eliminations |  |  | Consolidated |
United States |  | $ | 452 |  |  | $ | 436 |  |  | $ | 92 |  |  | $ | (25 | ) |  | $ | 955 |
Canada and Europe |  |  | 81 |  |  |  | — |  |  |  | 11 |  |  |  | — |  |  |  | 92 |
Net revenues |  | $ | 533 |  |  | $ | 436 |  |  | $ | 103 |  |  | $ | (25 | ) |  | $ | 1,047 |
|  | Three Months Ended September 30, 2020 |
|  | Safety Services |  |  | Specialty Services |  |  | Industrial Services |  |  | Corporate and Eliminations |  |  | Consolidated |
United States |  | $ | 361 |  |  | $ | 400 |  |  | $ | 144 |  |  | $ | (4 | ) |  | $ | 901 |
Canada and Europe |  |  | 43 |  |  |  | — |  |  |  | 14 |  |  |  | — |  |  |  | 57 |
Net revenues |  | $ | 404 |  |  | $ | 400 |  |  | $ | 158 |  |  | $ | (4 | ) |  | $ | 958 |
|  | Nine Months Ended September 30, 2021 |
|  | Safety Services |  |  | Specialty Services |  |  | Industrial Services |  |  | Corporate and Eliminations |  |  | Consolidated |
United States |  | $ | 1,257 |  |  | $ | 1,172 |  |  | $ | 172 |  |  | $ | (51 | ) |  | $ | 2,550 |
Canada and Europe |  |  | 254 |  |  |  | — |  |  |  | 24 |  |  |  | — |  |  |  | 278 |
Net revenues |  | $ | 1,511 |  |  | $ | 1,172 |  |  | $ | 196 |  |  | $ | (51 | ) |  | $ | 2,828 |
|  | Nine Months Ended September 30, 2020 |
|  | Safety Services |  |  | Specialty Services |  |  | Industrial Services |  |  | Corporate and Eliminations |  |  | Consolidated |
United States |  | $ | 1,074 |  |  | $ | 1,049 |  |  | $ | 445 |  |  | $ | (11 | ) |  | $ | 2,557 |
Canada and Europe |  |  | 125 |  |  |  | — |  |  |  | 23 |  |  |  | — |  |  |  | 148 |
Net revenues |  | $ | 1,199 |  |  | $ | 1,049 |  |  | $ | 468 |  |  | $ | (11 | ) |  | $ | 2,705 |
Summary of Accounts Receivable, Net of Allowances, Contract Assets and Contract Liabilities from Contracts with Customer | The opening and closing balances of accounts receivable, net of allowances, contract assets and contract liabilities from contracts with customers as of September 30, 2021 and December 31, 2020 are as follows:
|  | Accounts receivable, net of allowances |  |  | Contract Assets |  |  | Contract Liabilities |
Balance as of September 30, 2021 |  | $ | 723 |  |  | $ | 224 |  |  | $ | 238 |
Balance as of December 31, 2020 |  |  | 639 |  |  |  | 142 |  |  |  | 219 |

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