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Operating Information by Segment and Geographic Area - Narrative (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Segment reporting information
Revenue	$ 4,118,556	$ 4,133,612
General and Administrative Expense
Segment reporting information
Foreign currency gains and (losses)	44,000	(19,000)
Energy & Chemicals
Segment reporting information
Other than temporary impairment for equity method investments	86,000
Energy & Chemicals | Credit Losses Associated with Clients Affected by Impacts of COVID-19
Segment reporting information
Allowance for doubtful accounts on receivables	55,000
Diversified Services
Segment reporting information
Impairment loss	169,000
Impairment of intangible assets	27,000
Decrease in accounts receivable	39,000
Reportable segments | Infrastructure & Power | Forecast revisions for estimated cost growth for a fixed-price, gas-fired power plant project
Segment reporting information
Effect of forecast revision on estimated project cost		$ 26,000
Effect of forecast revision on estimated project cost (in dollars per share)		$ 0.14
Reportable segments | Other | Nu Scale Power
Segment reporting information
Research and development expense	23,000	$ 16,000
Reportable segments | Other | Nu Scale Power | Cost-sharing agreement, research and development activities | U.S. Department of Energy | Total cost of revenue
Segment reporting information
Qualified expenses reimbursed	13,000	13,000
Intersegment Eliminations | Diversified Services
Segment reporting information
Revenue	$ 77,000	80,000
North America | Energy & Chemicals
Segment reporting information
Change in cost and schedule impacts		$ 31,000
Change in cost and schedule impacts (in dollars per share)		$ 0.22
North America | Energy & Chemicals | Forecast Revisions For Estimated Cost Growth On An Offshore Project
Segment reporting information
Pre-tax charges adversely affecting earnings before taxes		$ 61,000
Pre-tax charges adversely affecting earnings before taxes (in dollars per share)		$ 0.33

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