Annual report pursuant to Section 13 and 15(d)

Contracts Receivable and Retainage - Amounts Due on Contracts (Detail)

v3.3.1.900
Contracts Receivable and Retainage - Amounts Due on Contracts (Detail)
$ in Thousands
12 Months Ended
Dec. 31, 2015
USD ($)
Customer
Dec. 31, 2014
USD ($)
Long-term Contracts or Programs Disclosure [Line Items]    
Current receivables $ 47,008 $ 80,448
Retainage due within one year 52 0
Accounts receivable, gross 47,104 84,051
Less allowance for doubtful accounts 44 3,603
Accounts receivable, net 47,060 80,448
Completed Contracts    
Long-term Contracts or Programs Disclosure [Line Items]    
Current receivables 15,904 24,667
Long term receivables due after one year 0 0
Contracts In Progress    
Long-term Contracts or Programs Disclosure [Line Items]    
Current receivables 31,148 59,384
Retainage due within one year 52 $ 0
Top 6 Customers    
Long-term Contracts or Programs Disclosure [Line Items]    
Current receivables $ 29,900  
Percentage of contract receivable 63.70%  
Number of major customers, contracts receivable | Customer 6