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 $)
In Thousands, unless otherwise specified
6 Months Ended
Jun. 30, 2013
Dec. 31, 2012
Jun. 30, 2013
Top Four Customer [Member]
Customer
Long-term Contracts or Programs Disclosure [Line Items]      
Contract receivable $ 73,196 $ 60,535 $ 57,700
Number of major customers account for 78.8% of contract receivable     4
Percentage of contract receivable     78.80%