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Nature of Business and Summary of Significant Accounting Policies - Additional Information (Detail)
shares in Millions
12 Months Ended
Jul. 12, 2016
Dec. 31, 2016
USD ($)
Subsidiary
Building
Land
shares
Dec. 31, 2015
USD ($)
Building
Land
shares
Dec. 31, 2014
USD ($)
shares
Nature Of Business And Summary Of Significant Accounting Policies [Line Items]        
Cash equivalents and restricted cash, original maturities of highly liquid investments   3 months    
Accounts receivables payment period from invoice date   30 days    
Inventory valued on last-in, first-out method   8.00% 13.00%  
Number of building held for sale | Building   2 1  
Number of tracts of land held for sale | Land   2 1  
Property, Plant and Equipment, Useful Life   13 years    
Incurred or capitalized deferred financing costs   $ 0 $ 2,900,000 $ 400,000
Amortization of deferred finance cost   1,054,000 1,062,000 561,000
Percentage of Completion Revenue   7,900,000    
Provision for Estimated losses on uncompleted contracts   0 0  
Advertisement expense   $ 900,000 $ 1,000,000 $ 1,000,000
Anti-dilutive options and warrants and unvested restricted stock units outstanding | shares   1.6 1.5 0.1
Foreign Currency Transaction Gain (Loss)   $ 700,000 $ (1,700,000) $ (2,300,000)
Interest Expense [Member]        
Nature Of Business And Summary Of Significant Accounting Policies [Line Items]        
Amortization of deferred finance cost   1,100,000 800,000 $ 600,000
Discount to Debt [Member]        
Nature Of Business And Summary Of Significant Accounting Policies [Line Items]        
Capitalized deferred financing costs   $ 3,200,000 4,200,000  
Modification of Credit Agreement [Member] | Interest Expense [Member]        
Nature Of Business And Summary Of Significant Accounting Policies [Line Items]        
Amortization of deferred finance cost     $ 300,000  
Patents [Member]        
Nature Of Business And Summary Of Significant Accounting Policies [Line Items]        
Intangible assets, Useful Life   17 years    
Tradename [Member]        
Nature Of Business And Summary Of Significant Accounting Policies [Line Items]        
Intangible assets, Useful Life   10 years    
Non-compete Agreements [Member]        
Nature Of Business And Summary Of Significant Accounting Policies [Line Items]        
Intangible assets, Useful Life   5 years    
Employment Agreements [Member]        
Nature Of Business And Summary Of Significant Accounting Policies [Line Items]        
Intangible assets, Useful Life   3 years    
Backlog [Member]        
Nature Of Business And Summary Of Significant Accounting Policies [Line Items]        
Intangible assets, Useful Life   1 year    
Minimum [Member] | Technology [Member]        
Nature Of Business And Summary Of Significant Accounting Policies [Line Items]        
Intangible assets, Useful Life   7 years    
Minimum [Member] | Customer Lists [Member]        
Nature Of Business And Summary Of Significant Accounting Policies [Line Items]        
Intangible assets, Useful Life   5 years    
Maximum [Member] | Technology [Member]        
Nature Of Business And Summary Of Significant Accounting Policies [Line Items]        
Intangible assets, Useful Life   10 years    
Maximum [Member] | Customer Lists [Member]        
Nature Of Business And Summary Of Significant Accounting Policies [Line Items]        
Intangible assets, Useful Life   20 years    
Building and Improvements [Member] | Minimum [Member]        
Nature Of Business And Summary Of Significant Accounting Policies [Line Items]        
Property, Plant and Equipment, Useful Life   5 years    
Building and Improvements [Member] | Maximum [Member]        
Nature Of Business And Summary Of Significant Accounting Policies [Line Items]        
Property, Plant and Equipment, Useful Life   40 years    
Machinery and Equipment [Member] | Minimum [Member]        
Nature Of Business And Summary Of Significant Accounting Policies [Line Items]        
Property, Plant and Equipment, Useful Life   2 years    
Machinery and Equipment [Member] | Maximum [Member]        
Nature Of Business And Summary Of Significant Accounting Policies [Line Items]        
Property, Plant and Equipment, Useful Life   15 years    
CECO Filters, Inc. and Subsidiaries ("CFI") [Member]        
Nature Of Business And Summary Of Significant Accounting Policies [Line Items]        
Number of wholly owned subsidiaries | Subsidiary   2    
Fisher-Klosterman, Inc. ("FKI") [Member]        
Nature Of Business And Summary Of Significant Accounting Policies [Line Items]        
Number of wholly owned subsidiaries | Subsidiary   3    
Met-Pro Technologies LLC ("Met-Pro") [Member]        
Nature Of Business And Summary Of Significant Accounting Policies [Line Items]        
Number of wholly owned subsidiaries | Subsidiary   11    
CECO Group, Inc. [Member]        
Nature Of Business And Summary Of Significant Accounting Policies [Line Items]        
Number of wholly owned subsidiaries | Subsidiary   2    
Peerless Mfg. Co. ("PMFG") [Member]        
Nature Of Business And Summary Of Significant Accounting Policies [Line Items]        
Number of wholly owned subsidiaries | Subsidiary   5    
Ownership percentage by parent 100.00% 60.00%    
Percentage of ownership by parent in net income loss 40.00% 80.00%