Summary of Significant Accounting Principles (Tables)

3 Months Ended

Mar. 31, 2020

Accounting Policies [Abstract]

Schedule of depreciable lives of property, plant and equipment

Automobiles and trucks	3 to 5 years
Buildings and improvements	5 to 30 years
Construction equipment	3 to 15 years
Vessels and other equipment	1 to 15 years
Office equipment	1 to 5 years