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Accounts Payable and Accrued Expenses - Summary of Accounts Payable and Accrued Expenses (Detail) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2014
Dec. 31, 2013
Payables and Accruals [Abstract]    
Trade accounts payable, including due to subcontractors $ 21,773 $ 23,108
Compensation and related benefits 1,697 2,412
Accrued interest 164 399
Current portion of earn-out liability 2,364 1,812
Accrued warranty 1,162 1,107
Other accrued expenses 6,405 5,518
Accounts payable and accrued expenses $ 33,565 $ 34,356