Annual report pursuant to Section 13 and 15(d)

Business Combination (Details 4)

v3.7.0.1
Business Combination (Details 4) - USD ($)
$ in Thousands
1 Months Ended 12 Months Ended
Jul. 20, 2016
Dec. 31, 2016
Limbach [Member]    
Business Acquisition [Line Items]    
Total Intangible assets, excluding Goodwill $ 20,910  
Trade Name [Member] | Limbach [Member]    
Business Acquisition [Line Items]    
Trade name 9,960  
BackLog - Construction [Member]    
Business Acquisition [Line Items]    
Finite-Lived Intangible Asset, Useful Life   2 years 6 months
BackLog - Construction [Member] | Limbach [Member]    
Business Acquisition [Line Items]    
Finite-lived Intangible Assets, Fair Value Disclosure $ 4,830  
Finite-Lived Intangible Asset, Useful Life 2 years 6 months  
BackLog - Service [Member]    
Business Acquisition [Line Items]    
Finite-Lived Intangible Asset, Useful Life   1 year
BackLog - Service [Member] | Limbach [Member]    
Business Acquisition [Line Items]    
Finite-lived Intangible Assets, Fair Value Disclosure $ 880  
Finite-Lived Intangible Asset, Useful Life 1 year  
Customer Relationships - Service [Member] | Limbach [Member]    
Business Acquisition [Line Items]    
Finite-lived Intangible Assets, Fair Value Disclosure $ 4,710  
Finite-Lived Intangible Asset, Useful Life 15 years  
Favorable Leasehold Interests [Member]    
Business Acquisition [Line Items]    
Finite-Lived Intangible Asset, Useful Life   8 years 8 months 1 day
Favorable Leasehold Interests [Member] | Limbach [Member]    
Business Acquisition [Line Items]    
Finite-lived Intangible Assets, Fair Value Disclosure $ 530  
Finite-Lived Intangible Asset, Useful Life 8 years 8 months 1 day