Quarterly report pursuant to Section 13 or 15(d)

Revenue and Contract Costs - Narrative (Details)

v3.5.0.2
Revenue and Contract Costs - Narrative (Details)
$ in Thousands
 6 Months Ended 9 Months Ended
Dec. 31, 2015
USD ($)
Sep. 30, 2016
USD ($)
Customer
Project
Long-term Contracts or Programs Disclosure [Line Items]    
Costs and estimated earnings in excess of billings on uncompleted contracts $ 12,822 $ 18,679
Number of major customers | Customer   2
Billings in excess of costs and estimated earnings 7,081 $ 7,154
Customer advances   $ 5,900
Number of major customers, advances | Customer   4
Loss related to disputed change orders   $ 358
Project, Approved Scope, Unapproved Price    
Long-term Contracts or Programs Disclosure [Line Items]    
Revenue   $ 87
Number of projects | Project   2
Large Deepwater Project, Recently Delivered    
Long-term Contracts or Programs Disclosure [Line Items]    
Contract losses $ 24,500  
Two Major Customer | Customer Concentration Risk | Costs in Excess of Billings    
Long-term Contracts or Programs Disclosure [Line Items]    
Costs and estimated earnings in excess of billings on uncompleted contracts   $ 10,200