Quarterly report pursuant to Section 13 or 15(d)

Commitments and Contingencies - (Details)

v3.7.0.1
Commitments and Contingencies - (Details)
$ in Millions
1 Months Ended
Nov. 30, 2016
USD ($)
Apr. 01, 2016
plaintiff
Apr. 30, 2011
Employee
Apr. 30, 2011
subcontractor
Contingencies [Abstract]        
Number of deaths of subcontractor employees     5 5
Aviation Litigation        
Contingencies [Abstract]        
Number of plaintiff deaths   1    
Number of plaintiffs injured   2    
Loss contingency, damages sought | $ $ 1.0