Quarterly report pursuant to Section 13 or 15(d)

Commitments and Contingencies - (Details)

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Commitments and Contingencies - (Details) - Jun. 30, 2015
$ in Millions
USD ($)
Project
Subcontractor
Commitments [Abstract]  
Number of bonded projects | Project 2
Aggregate bonded amount | $ $ 4
Contingencies [Abstract]  
Number of subcontractors that operated the facility 1
Number of deaths of subcontractor employees 5
Number of subcontractors for lawsuits filed 2