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Nature of Business and Summary of Significant Accounting Policies - Consolidated Financial Statements Include Accounts of Subsidiaries (Detail) | Dec. 31, 2017
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CECO Group, Inc. [Member] |
Consolidation, Wholly Owned Subsidiary, Parent Ownership Interest [Line Items] |
CECO Group Global Holdings LLC | 100.00%
CECO Group Global Holdings LLC [Member] |
Consolidation, Wholly Owned Subsidiary, Parent Ownership Interest [Line Items] |
CECO Group Global Holdings LLC | 100.00%
CECO Filters, Inc. and Subsidiaries ("CFI") [Member] |
Consolidation, Wholly Owned Subsidiary, Parent Ownership Interest [Line Items] |
CECO Group Global Holdings LLC | 99.00%
The Kirk And Blum Manufacturing Company [Member] |
Consolidation, Wholly Owned Subsidiary, Parent Ownership Interest [Line Items] |
CECO Group Global Holdings LLC | 100.00%
CECO Air Quality Solutions, Inc [Member] |
Consolidation, Wholly Owned Subsidiary, Parent Ownership Interest [Line Items] |
CECO Group Global Holdings LLC | 100.00%
EFFOX, Inc. ( "Effox") [Member] |
Consolidation, Wholly Owned Subsidiary, Parent Ownership Interest [Line Items] |
CECO Group Global Holdings LLC | 100.00%
Fisher-Klosterman, Inc. ("FKI") [Member] |
Consolidation, Wholly Owned Subsidiary, Parent Ownership Interest [Line Items] |
CECO Group Global Holdings LLC | 100.00%
Flextor, Inc. ("Flextor") [Member] |
Consolidation, Wholly Owned Subsidiary, Parent Ownership Interest [Line Items] |
CECO Group Global Holdings LLC | 100.00%
Adwest Technologies, Inc. ('Adwest') [Member] |
Consolidation, Wholly Owned Subsidiary, Parent Ownership Interest [Line Items] |
CECO Group Global Holdings LLC | 100.00%
Aarding Thermal Acoustics B.V. ("Aarding") [Member] |
Consolidation, Wholly Owned Subsidiary, Parent Ownership Interest [Line Items] |
CECO Group Global Holdings LLC | 100.00%
Met-Pro Technologies LLC ("Met-Pro") [Member] |
Consolidation, Wholly Owned Subsidiary, Parent Ownership Interest [Line Items] |
CECO Group Global Holdings LLC | 100.00%
Peerless Mfg. Co. ("PMFG") [Member] |
Consolidation, Wholly Owned Subsidiary, Parent Ownership Interest [Line Items] |
CECO Group Global Holdings LLC | 100.00%

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