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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% |  |

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