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Accounts Payable and Accrued Expenses - Summary of Accounts Payable and Accrued Expenses (Detail) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Payables and Accruals [Abstract]    
Trade accounts payable, including due to subcontractors $ 35,268us-gaap_AccountsPayableTradeCurrent $ 31,882us-gaap_AccountsPayableTradeCurrent
Compensation and related benefits 1,987us-gaap_EmployeeRelatedLiabilitiesCurrent 2,976us-gaap_EmployeeRelatedLiabilitiesCurrent
Accrued interest 143us-gaap_InterestPayableCurrent 193us-gaap_InterestPayableCurrent
Current portion of earn-out liability 9,809us-gaap_BusinessCombinationContingentConsiderationLiabilityCurrent 8,738us-gaap_BusinessCombinationContingentConsiderationLiabilityCurrent
Accrued warranty 795us-gaap_ProductWarrantyAccrualClassifiedCurrent 936us-gaap_ProductWarrantyAccrualClassifiedCurrent
Other accrued expenses 9,115us-gaap_OtherAccruedLiabilitiesCurrent 6,737us-gaap_OtherAccruedLiabilitiesCurrent
Accounts payable and accrued expenses $ 57,117us-gaap_AccountsPayableAndAccruedLiabilitiesCurrent $ 51,462us-gaap_AccountsPayableAndAccruedLiabilitiesCurrent