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Accounts Payable and Accrued Expenses - Summary of Accounts Payable and Accrued Expenses (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Payables and Accruals [Abstract]    
Trade accounts payable, including due to subcontractors $ 31,882us-gaap_AccountsPayableTradeCurrent $ 23,108us-gaap_AccountsPayableTradeCurrent
Compensation and related benefits 2,976us-gaap_EmployeeRelatedLiabilitiesCurrent 2,412us-gaap_EmployeeRelatedLiabilitiesCurrent
Accrued interest 193us-gaap_InterestPayableCurrent 399us-gaap_InterestPayableCurrent
Current portion of earn-out liability 8,738us-gaap_BusinessCombinationContingentConsiderationLiabilityCurrent 1,812us-gaap_BusinessCombinationContingentConsiderationLiabilityCurrent
Accrued warranty 936us-gaap_ProductWarrantyAccrualClassifiedCurrent 1,107us-gaap_ProductWarrantyAccrualClassifiedCurrent
Other accrued expenses 6,737us-gaap_OtherAccruedLiabilitiesCurrent 5,518us-gaap_OtherAccruedLiabilitiesCurrent
Accounts payable and accrued expenses $ 51,462us-gaap_AccountsPayableAndAccruedLiabilitiesCurrent $ 34,356us-gaap_AccountsPayableAndAccruedLiabilitiesCurrent