Nature of Business and Summary of Significant Accounting Policies - Additional Information (Detail)	12 Months Ended
	Dec. 31, 2015 USD ($) Subsidiary shares	Dec. 31, 2014 USD ($) shares	Dec. 31, 2013 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
Restricted cash	$ 5,319,000	$ 1,200,000
Accounts receivables payment period from invoice date	30 days
Inventory valued on last-in, first-out method	13.00%
Capitalized deferred financing costs	$ 2,900,000	400,000	$ 2,700,000
Capitalized deferred financing costs	4,200,000	2,400,000
Amortization of deferred finance cost	1,062,000	561,000	304,000
Provision for Estimated losses on uncompleted contracts	0	0	0
Advertisement expense	$ 1,000,000	$ 1,000,000	$ 500,000
Anti-dilutive options and warrants outstanding | shares	1,500,000	100,000	0
Foreign Currency Transaction Gain (Loss)	$ (1,700,000)	$ (2,300,000)	$ 1,000,000
Deferred tax assets	17,898,000	5,705,000
New Accounting Pronouncement Early Adoption Effect [Member]
Nature Of Business And Summary Of Significant Accounting Policies [Line Items]
Deferred tax assets		4,100,000
Interest Expense [Member]
Nature Of Business And Summary Of Significant Accounting Policies [Line Items]
Capitalized deferred financing costs	300,000
Amortization of deferred finance cost	800,000	600	$ 300
Discount to Debt [Member]
Nature Of Business And Summary Of Significant Accounting Policies [Line Items]
Capitalized deferred financing costs	$ 4,200,000	$ 2,300,000
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
CECO Group Global Holdings LLC	99.00%
Fisher-Klosterman, Inc. ("FKI") [Member]
Nature Of Business And Summary Of Significant Accounting Policies [Line Items]
Number of wholly owned subsidiaries | Subsidiary	3
CECO Group Global Holdings LLC	100.00%
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 Global Holdings LLC	100.00%
CECO Group, Inc. [Member]
Nature Of Business And Summary Of Significant Accounting Policies [Line Items]
Number of wholly owned subsidiaries | Subsidiary	2
CECO Group Global Holdings LLC	100.00%
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	60.00%
Percentage of ownership by parent in net income loss	80.00%
CECO Group Global Holdings LLC	100.00%