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Business Acquisitions and Dispositions - Additional Information (Details)					12 Months Ended
	Oct. 01, 2020 USD ($)	Jul. 21, 2020 USD ($)	Jun. 12, 2020 USD ($)	Jun. 01, 2020	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($) segment
Business Acquisition [Line Items]
Loss on disposal of entity					$ 13,763,000		$ (20,270,000)
Weighted-average amortization period of intangible assets					6 years 8 months 12 days	3 years 9 months 18 days
Goodwill					$ 66,537,000	$ 80,642,000	96,890,000
Customer Relationships
Business Acquisition [Line Items]
Weighted-average amortization period of intangible assets					3 years 3 months 18 days	4 years
Crawford Carvallo
Business Acquisition [Line Items]
Initial lump-sum payment of purchase price	$ 11,600,000,000
Net tangible assets acquired	15,120,000,000
Net tangible assets acquired including cash	1,599,000,000
Intangible assets acquired	$ 4,400,000
Weighted-average amortization period of intangible assets	10 years
Revenues					$ 2,214,000
Goodwill					5,501,000
Crawford Carvallo | Customer Relationships
Business Acquisition [Line Items]
Weighted-average amortization period of intangible assets	15 years
Global Technical Services | Europe
Business Acquisition [Line Items]
Payment to acquire business						$ 1,519,000,000
Net tangible assets acquired including cash						135,000,000
Business combinations, total consideration						2,431,000,000
Cash to be paid in one year						234,000,000
Cash to be paid in three years						351,000,000
Contingent consideration						327,000,000
Business combination, definite-lived intangible assets						951,000,000
Goodwill						$ 1,164,000,000
Global Technical Services | Canada
Business Acquisition [Line Items]
Payment to acquire business							2,500,000,000
Net tangible assets acquired including cash							134,000,000
Business combinations, total consideration							3,400,000,000
Cash to be paid in one year							348,000,000
Contingent consideration							377,000,000
Business combination, definite-lived intangible assets							1,094,000,000
Goodwill							1,296,000,000
Business combination, deferred taxes							202,000,000
Business combination, net tangible assets							$ 462,000,000
Number of businesses acquired | segment							2
Maximum | Crawford Carvallo
Business Acquisition [Line Items]
Payment to acquire business	$ 11,700,000,000
Crawford Compliance Inc.
Business Acquisition [Line Items]
Variable interest entity, ownership percentage				51.00%
Loss on disposal of entity					(912,000)
Lloyd Warwick International
Business Acquisition [Line Items]
Variable interest entity, ownership percentage			51.00%
Loss on disposal of entity					14,700,000
Proceeds from sale of business			$ 19,600,000
Repayment of debt			$ 3,600,000
Working capital adjustments recognized under acquisition agreement					700,000
Purchase price					20,300,000
Gain on disposition, net of tax					11,700,000
WeGoLook, LC
Business Acquisition [Line Items]
Membership interest percentage		15.00%
Payment to acquire business		$ 310,000
Accelerated amortization amount recognized					$ 1,100,000
Crawford Carvallo
Business Acquisition [Line Items]
Membership interest percentage	85.00%
Percentage of held interest prior to acquisition	15.00%

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