Quarterly report pursuant to Section 13 or 15(d)

Commitments and Contingencies - (Details)

v3.5.0.2
Commitments and Contingencies - (Details)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2016
USD ($)
Jun. 30, 2016
USD ($)
Project
Subcontractor
Mar. 31, 2016
USD ($)
Commitments [Abstract]      
Number of bonded projects | Project   1  
Aggregate bonded amount     $ 3.0
Contingencies [Abstract]      
Number of deaths of subcontractor employees | Subcontractor   5  
Number of subcontractors for lawsuits filed | Subcontractor   2  
Heritage Disposal and Storage [Member]      
Contingencies [Abstract]      
Litigation settlement amount   $ 4.8  
Litigation settlement over estimated amount $ 1.5 1.5  
Loss contingency reserve 1.2    
Heritage Disposal and Storage [Member] | Minimum [Member]      
Contingencies [Abstract]      
Loss contingency range of possible loss 1.2 1.2  
Heritage Disposal and Storage [Member] | Maximum [Member]      
Contingencies [Abstract]      
Loss contingency range of possible loss $ 5.5 $ 5.5