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Amounts Due on Contracts (Detail) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2012 | Dec. 31, 2011
--- | --- | ---
Long-term Contracts or Programs Disclosure [Line Items] |  |
Current receivables | $ 60,535 | $ 72,474
Long term receivables due after one year |  | 625
Retainage due within one year | 1,298 | 4,313
Accounts Receivable, Gross | 76,341 | 77,436
Less allowance for doubtful accounts | 14,508 | 24
Accounts Receivable, Net | 61,833 | 77,412
Completed Contracts |  |
Long-term Contracts or Programs Disclosure [Line Items] |  |
Current receivables | 3,320 | 11,521
Long term receivables due after one year |  | 625
Contracts In Progress |  |
Long-term Contracts or Programs Disclosure [Line Items] |  |
Current receivables | 71,723 | 60,977
Retainage due within one year | $ 1,298 | $ 4,313

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