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Business and Organization (Details)	12 Months Ended
	Dec. 31, 2020 Segment	Dec. 31, 2019 division	Dec. 31, 2018 division
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Number of reportable segments | Segment	2
Number of specialty utility foundation and pole-setting contractors		2
Number of communications infrastructure services businesses			2

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- Definition

Number Of Communications Infrastructure Services Businesses

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- Definition

Number Of Special Utility Foundation And Pole-Setting Contractors

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- Definition

Number of segments reported by the entity. A reportable segment is a component of an entity for which there is an accounting requirement to report separate financial information on that component in the entity's financial statements.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 18
-URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e8672-108599

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