Quarterly report pursuant to Section 13 or 15(d)

Contracts Receivable and Retainage - Additional Information (Detail)

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Contracts Receivable and Retainage - Additional Information (Detail) (USD $)
3 Months Ended 9 Months Ended
Sep. 30, 2014
Dec. 31, 2013
Sep. 30, 2014
Top 3 Customer [Member]
Customer
Long-term Contracts or Programs Disclosure [Line Items]      
Contract receivable $ 82,287,000 $ 98,579,000 $ 57,600,000
Number of major customers account for 70.3% of contract receivable     3
Percentage of contract receivable     70.00%
Allowance for bad debt included in contracts receivable balance 200,000    
Amount of reserved contract receivable $ 600,000