Annual report pursuant to Section 13 and 15(d)

Backlog (Details Textual)

v3.19.1
Backlog (Details Textual) - USD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Construction [Member]    
Estimated Revenue From Uncompleted Contract $ 505.5  
Construction [Member] | Predecessor [Member]    
Estimated Revenue From Uncompleted Contract   $ 426.7
Service [Member]    
Estimated Revenue From Uncompleted Contract $ 54.2  
Service [Member] | Predecessor [Member]    
Estimated Revenue From Uncompleted Contract   $ 34.7