Significant Accounting Policies - Additional Information (Detail) $ in Millions	12 Months Ended
	Dec. 31, 2022 USD ($) Segment	Dec. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)
Foreign currency transaction (loss) gain	$ (2)	$ (3)	$ 12
Foreign currency translation (losses) gains	$ (164)	(11)	9
Lease, practical expedients for less than 1 year initial term	true
Number of operating segments | Segment	2
Number of reportable segments | Segment	2
Change in goodwill allocation, description	The components are aligned to one of the Company’s two reportable segments, Safety Services or Specialty Services. Goodwill is required to be evaluated for impairment at the reporting unit level, which represents the operating segment level or one level below the operating segment level for which discrete financial information is available.Management identifies its reporting units by assessing whether components have discrete financial information available, engage in business activities, and have a segment manager regularly review the component’s operating results. If two or more components are deemed economically similar, those components are aggregated into one reporting unit when performing the annual goodwill impairment test.
Earnings	$ 73	47	(153)
Accrued liabilities for workers' compensation, general and automobile claims	123	64
Receivable from Insurance carriers	11	8
Outstanding letters of credit	2,832	1,791
Accrued liabilities for health insurance claims	7	6
Letters of Credit [Member]
Outstanding letters of credit	$ 121	73
Customer Relationships [Member] | Minimum [Member]
Intangible assets, estimated useful lives	2 years
Customer Relationships [Member] | Maximum [Member]
Intangible assets, estimated useful lives	15 years
Trade names and Trademarks [Member] | Maximum [Member]
Intangible assets, estimated useful lives	15 years
Backlog Intangibles [Member] | Minimum [Member]
Intangible assets, estimated useful lives	6 months
Backlog Intangibles [Member] | Maximum [Member]
Intangible assets, estimated useful lives	36 months
Other Noncurrent Liabilities [Member]
Accrued liabilities for workers' compensation, general and automobile claims	$ 66	42
Joint Ventures [Member] | Other Assets [Member]
Investment balance	4	4
Joint Ventures [Member] | Investment Income and Other, Net [Member]
Earnings	$ 3	$ 3	$ 14
ESPP [Member]
Percentage of fair market value of common stock	85.00%	85.00%