Quarterly report pursuant to Section 13 or 15(d)

Contracts Receivable and Retainage - Additional Information (Detail)

v2.4.0.8
Contracts Receivable and Retainage - Additional Information (Detail) (USD $)
9 Months Ended
Sep. 30, 2013
Dec. 31, 2012
Sep. 30, 2013
Top 3 Customer
Customer
Long-term Contracts or Programs Disclosure [Line Items]      
Contract receivable $ 75,130,000 $ 60,535,000 $ 54,500,000
Number of major customers account for 0% of contract receivable     3
Percentage of contract receivable     72.30%
Reserve for bad debt $ 800,000