Quarterly report pursuant to Section 13 or 15(d)

Revenue and Contract Costs - Pass Through Costs (Details)

v3.5.0.2
Revenue and Contract Costs - Pass Through Costs (Details)
3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Contractors [Abstract]        
Pass-through costs as a percentage of revenues 33.80% 45.30% 35.00% 43.20%