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Revenue From Customers - Backlog By Segment (Details) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
Disaggregation of Revenue [Line Items]
Backlog	$ 1,526,884	$ 1,493,115
E-Infrastructure Solutions Backlog
Disaggregation of Revenue [Line Items]
Backlog	541,150	432,613
Transportation Solutions Revenues
Disaggregation of Revenue [Line Items]
Backlog	898,679	963,267
Building Solutions Backlog - Commercial
Disaggregation of Revenue [Line Items]
Backlog	$ 87,055	$ 97,235

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- Definition

Amount of transaction price allocated to performance obligation that has not been recognized as revenue.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 13
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=123351226&loc=SL49130556-203045

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