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Goodwill and Intangibles - Summary of Changes In Carrying Amounts of Goodwill By Reportable Segments (Parenthetical) (Detail) $ in Millions	9 Months Ended
	Sep. 30, 2020 USD ($)
Goodwill [LineItems]
Goodwill, impairment loss	$ 193
Safety Services [Member]
Goodwill [LineItems]
Goodwill, impairment loss	83
Safety Services [Member] | Safety [Member]
Goodwill [LineItems]
Goodwill, impairment loss	57
Safety Services [Member] | Mechanical [Member]
Goodwill [LineItems]
Goodwill, impairment loss	26
Specialty Services [Member]
Goodwill [LineItems]
Goodwill, impairment loss	52
Specialty Services [Member] | Infrastructure Utility [Member]
Goodwill [LineItems]
Goodwill, impairment loss	30
Specialty Services [Member] | Fabrication [Member]
Goodwill [LineItems]
Goodwill, impairment loss	1
Specialty Services [Member] | Specialty Construction [Member]
Goodwill [LineItems]
Goodwill, impairment loss	21
Industrial Services [Member]
Goodwill [LineItems]
Goodwill, impairment loss	58
Industrial Services [Member] | Transmission [Member]
Goodwill [LineItems]
Goodwill, impairment loss	57
Industrial Services [Member] | Civil [Member]
Goodwill [LineItems]
Goodwill, impairment loss	$ 1

X

- Definition

Goodwill impairment loss at business with ongoing operations.

+ References

No definition available.

+ Details

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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