Quarterly report pursuant to Section 13 or 15(d)

Commitments and Contingencies - (Details)

v3.5.0.2
Commitments and Contingencies - (Details)
$ in Millions
1 Months Ended
Jun. 30, 2016
USD ($)
Mar. 31, 2013
subcontractor
Apr. 30, 2011
subcontractor
Sep. 30, 2016
USD ($)
Jun. 17, 2016
USD ($)
Contingencies [Abstract]          
Number of deaths of subcontractor employees | subcontractor     5    
Number of subcontractors for lawsuits filed | subcontractor   2      
Heritage Disposal and Storage          
Contingencies [Abstract]          
Litigation settlement amount $ 4.8        
Litigation settlement over estimated amount         $ 1.5
Heritage Disposal and Storage | Minimum          
Contingencies [Abstract]          
Loss contingency range of possible loss       $ 1.2  
Heritage Disposal and Storage | Maximum          
Contingencies [Abstract]          
Loss contingency range of possible loss       $ 5.5