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Accounts Payable and Accrued Expenses (Detail) (USD $)
Jun. 30, 2012
Dec. 31, 2011
Accounts Payable and Accrued Liabilities [Line Items]    
Accounts payable $ 4,794,698 $ 3,858,251
Accounts payable retainage 552,689 201,331
Accrued project costs 1,704,383 1,927,439
Restructuring liability 162,631  
Other accrued expenses 705,248 899,073
Total accounts payable and accrued expenses $ 7,919,649 $ 6,886,094