Quarterly report pursuant to Section 13 or 15(d)

Contracts Receivable and Retainage - Additional Information (Details)

v3.4.0.3
Contracts Receivable and Retainage - Additional Information (Details)
$ in Thousands
3 Months Ended
Mar. 31, 2016
USD ($)
Customer
Dec. 31, 2015
USD ($)
Long-term Contracts or Programs Disclosure [Line Items]    
Contract receivable $ 45,306 $ 47,060
Allowance for bad debt 97  
Top 4 Customer    
Long-term Contracts or Programs Disclosure [Line Items]    
Contract receivable $ 23,800  
Percentage of contract receivable 52.40%  
Number of major customers, contracts receivables | Customer 4