Quarterly report pursuant to Section 13 or 15(d)

Contract Costs - Additional Information (Detail)

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Contract Costs - Additional Information (Detail) (USD $)
 3 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Project
Jun. 30, 2013
Project
Dec. 31, 2013
Long-term Contracts or Programs Disclosure [Line Items]          
Pass-through costs as a percentage of revenue 50.90% 53.10% 50.10% 54.70%  
Costs and estimated earnings in excess of billings on uncompleted contracts, unbilled costs $ 17,564,000   $ 17,564,000   $ 24,727,000
Billings in excess of costs and estimated earnings, advances 19,561,000   19,561,000   35,006,000
Loss recorded for marine projects 3,700,000   4,700,000    
Total revenue recorded in relation to orders change in projects     5,200,000 1,700,000  
Number of projects orders changed     3 2  
Unbilled Contract Costs [Member]
          
Long-term Contracts or Programs Disclosure [Line Items]          
Costs and estimated earnings in excess of billings on uncompleted contracts, unbilled costs 5,500,000   5,500,000    
Number of major customers     3    
Contract Advances [Member]
          
Long-term Contracts or Programs Disclosure [Line Items]          
Number of major customers     3    
Billings in excess of costs and estimated earnings, advances $ 12,700,000   $ 12,700,000