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Debt - Additional Information (Detail) | 3 Months Ended | 9 Months Ended |  |  |  |  |  |  |
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Sep. 30, 2015 USD ($) | Sep. 30, 2014 USD ($) | Sep. 30, 2015 EUR (€) | Sep. 30, 2015 USD ($) | Sep. 30, 2015 GBP (£) | Sep. 30, 2014 USD ($) | Sep. 30, 2015 USD ($) | Sep. 30, 2015 CNY (¥) | Sep. 30, 2015 GBP (£) | Sep. 03, 2015 USD ($) | Dec. 31, 2014 EUR (€) | Dec. 31, 2014 USD ($) | Nov. 18, 2014 USD ($) | Aug. 27, 2013 USD ($) | Jul. 31, 2013 USD ($) | Jul. 31, 2013 CNY (¥) | Aug. 17, 2012 EUR (€) | Aug. 17, 2012 USD ($)
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Increased credit facility commitment for either revolving credit facility or term loan facility |  |  |  |  |  |  |  |  |  |  |  |  | $ 50,000,000 |  |  |  |  |
Unused credit availability under credit facility |  |  |  |  |  |  | $ 45,700,000 |  |  |  |  | $ 71,500,000 |  |  |  |  |  |
Weighted average interest rate on outstanding borrowings |  |  | 3.20% |  |  |  | 3.20% | 3.20% | 3.20% |  | 2.24% | 2.24% |  |  |  |  |  |
Maximum consolidated leverage ratio |  |  | 3.75 |  |  |  | 3.75 | 3.75 | 3.75 |  |  |  |  |  |  |  |  |
Minimum fixed charge coverage ratio |  |  | 1.25 | 1.25 | 1.25 |  |  |  |  |  |  |  |  |  |  |  |  |
Increased interest rate of loan due to default |  |  | 2.00% |  |  |  | 2.00% | 2.00% | 2.00% |  |  |  |  |  |  |  |  |
Other expenses for credit agreement |  |  |  |  |  |  | $ 6,000,000 |  |  |  |  |  |  |  |  |  |  |
Payment of customary fees under credit agreement | $ 2,900,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unamortized deferred financing costs |  |  |  |  |  |  | 4,500,000 |  |  |  |  | $ 2,400,000 |  |  |  |  |  |
Amortization expense | $ 200,000 | $ 100,000 |  | $ 400,000 |  | $ 400,000 |  |  |  |  |  |  |  |  |  |  |  |
Total outstanding borrowings |  |  |  |  |  |  | 194,283,000 |  |  |  |  | 111,856,000 |  |  |  |  |  |
Restricted cash balances |  |  |  |  |  |  | 5,350,000 |  |  |  |  | 1,200,000 |  |  |  |  |  |
Credit Agreement [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument fees expensed |  |  |  |  |  |  | 300,000 |  |  |  |  |  |  |  |  |  |  |
United Kingdom [Member] | Debenture Agreement [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash deposit |  |  |  | 2,800,000 | £ 1,900,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Germany [Member] | Debenture Agreement [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash deposit |  |  | € 600,000 | 700,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Singapore [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash deposit |  |  |  | $ 300,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aarding Thermal Acoustics B.V. ("Aarding") [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Facilities agreement, amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | € 10,500,000 | $ 11,800,000
Maximum debt as proportion of EBITDA |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3.0 | 3.0
Federal Funds Rate [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate |  |  | 0.50% | 0.50% | 0.50% |  |  |  |  |  |  |  |  |  |  |  |  |
One-Month LIBOR [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate |  |  | 1.00% | 1.00% | 1.00% |  |  |  |  |  |  |  |  |  |  |  |  |
Bank Overdrafts [Member] | Aarding Thermal Acoustics B.V. ("Aarding") [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate principal amount outstanding under the credit facilities |  |  | € 3,300,000 |  |  |  | $ 3,700,000 |  |  |  | € 0 | 0 |  |  |  |  |  |
Weighted average interest rate on outstanding borrowings |  |  | 1.95% |  |  |  | 1.95% | 1.95% | 1.95% |  |  |  |  |  |  |  |  |
Facilities agreement, amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | € 3,500,000 | $ 3,900,000
Debt instrument variable interest rate description |  |  | Three months Euribor plus 195 basis points | Three months Euribor plus 195 basis points | Three months Euribor plus 195 basis points |  |  |  |  |  |  |  |  |  |  |  |  |
PMFG, Inc. [Member] | PCMC Facility [Member] | Loan Agreement [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Facilities agreement, amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 6,900,000 | ¥ 43,000,000 |  |
Debt instrument, maturity date |  |  | Dec. 20, 2017 | Dec. 20, 2017 | Dec. 20, 2017 |  |  |  |  |  |  |  |  |  |  |  |  |
Total outstanding borrowings |  |  |  |  |  |  | $ 4,400,000 | ¥ 28,000,000 |  |  |  |  |  |  |  |  |  |
Interest rate |  |  | 7.00% |  |  |  | 7.00% | 7.00% | 7.00% |  |  |  |  |  |  |  |  |
Restricted cash balances |  |  |  |  |  |  | $ 400,000 |  |  |  |  |  |  |  |  |  |  |
PMFG, Inc. [Member] | PCMC LOC [Member] | Loan Agreement [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, maturity date |  |  | Dec. 31, 2015 | Dec. 31, 2015 | Dec. 31, 2015 |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate |  |  | 6.50% |  |  |  | 6.50% | 6.50% | 6.50% |  |  |  |  |  |  |  |  |
Short-term financing with Bank of China Limited |  |  |  |  |  |  | $ 1,600,000 | ¥ 10,000,000 |  |  |  |  |  |  |  |  |  |
Term Loan [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate principal amount outstanding under the credit facilities |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 65,000,000 |  |  |  |
Increased credit facility commitment for either revolving credit facility or term loan facility |  |  |  |  |  |  |  |  |  | $ 170,000,000 |  |  | 35,000,000 |  |  |  |  |
Total outstanding borrowings |  |  |  |  |  |  | 170,000,000 |  |  |  |  | 90,072,000 |  |  |  |  |  |
Term Loan [Member] | Met-Pro Corporation [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate principal amount outstanding under the credit facilities |  |  |  |  |  |  |  |  |  |  |  |  |  | 65,000,000 |  |  |  |
U.S. Dollar Revolving Loans [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate principal amount outstanding under the credit facilities |  |  |  |  |  |  |  |  |  |  |  |  |  | 70,500,000 |  |  |  |
Increased credit facility commitment for either revolving credit facility or term loan facility |  |  |  |  |  |  |  |  |  |  |  |  | $ 15,000,000 |  |  |  |  |
Decreased credit facility commitment for either revolving credit facility or term loan facility |  |  |  |  |  |  |  |  |  | $ 60,500,000 |  |  |  |  |  |  |  |
U.S. Dollar Revolving Loans [Member] | Met-Pro Corporation [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate principal amount outstanding under the credit facilities |  |  |  |  |  |  |  |  |  |  |  |  |  | 52,000,000 |  |  |  |
Multi-currency Revolving Credit Facility [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate principal amount outstanding under the credit facilities |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 19,500,000 |  |  |  |
Letters of Credit [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate principal amount outstanding under the credit facilities |  |  |  |  |  |  | 15,300,000 |  |  |  |  | 9,500,000 |  |  |  |  |  |
Bank Guarantees [Member] | Singapore [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate principal amount outstanding under the credit facilities |  |  |  |  |  |  | 1,100,000 |  |  |  |  |  |  |  |  |  |  |
Bank Guarantees [Member] | Aarding Thermal Acoustics B.V. ("Aarding") [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate principal amount outstanding under the credit facilities |  |  | € 6,200,000 |  |  |  | $ 7,000,000 |  |  |  | € 5,500,000 | $ 6,700,000 |  |  |  |  |  |
Weighted average interest rate on outstanding borrowings |  |  | 2.65% |  |  |  | 2.65% | 2.65% | 2.65% |  |  |  |  |  |  |  |  |
Facilities agreement, amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | € 7,000,000 | $ 7,900,000
Debt instrument variable interest rate description |  |  | Three months Euribor plus 265 basis points | Three months Euribor plus 265 basis points | Three months Euribor plus 265 basis points |  |  |  |  |  |  |  |  |  |  |  |  |
Bank Guarantees [Member] | PMFG, Inc. [Member] | PCMC Facility [Member] | Loan Agreement [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate principal amount outstanding under the credit facilities |  |  |  |  |  |  | $ 400,000 |  |  |  |  |  |  |  |  |  |  |
Letter Of Credit And Bank Guarantees [Member] | United Kingdom [Member] | Debenture Agreement [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate principal amount outstanding under the credit facilities |  |  |  |  |  |  | 9,100,000 |  | £ 6,000,000 |  |  |  |  |  |  |  |  |
Outstanding stand-by letters of credit and bank guarantees |  |  |  | $ 5,400,000 | £ 3,600,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Letter Of Credit And Bank Guarantees [Member] | Germany [Member] | Debenture Agreement [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate principal amount outstanding under the credit facilities |  |  | € 4,800,000 |  |  |  | $ 5,400,000 |  |  |  |  |  |  |  |  |  |  |
Outstanding stand-by letters of credit and bank guarantees |  |  | € 1,800,000 | $ 2,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Minimum [Member] | Cross Currency Interest Rate Contract [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate |  |  | 2.00% | 2.00% | 2.00% |  |  |  |  |  |  |  |  |  |  |  |  |
Minimum [Member] | Aarding Thermal Acoustics B.V. ("Aarding") [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowers solvency ratio |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 30.00% | 30.00%
Minimum [Member] | Base Rate [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate |  |  | 1.00% | 1.00% | 1.00% |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum [Member] | Cross Currency Interest Rate Contract [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate |  |  | 3.00% | 3.00% | 3.00% |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum [Member] | Base Rate [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate |  |  | 2.00% | 2.00% | 2.00% |  |  |  |  |  |  |  |  |  |  |  |  |

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- Definition Debt default increase in basis spread on interest rate. + References No definition available. + Details
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- Definition Debt instrument solvency ratio. + References No definition available. + Details
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- Definition Line of credit facility right to decrease commitment. + References No definition available. + Details
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- Definition The reference rate for the variable rate of the debt instrument, such as LIBOR or the US Treasury rate and the maturity of the reference rate used, such as three months or six months LIBOR. + References No definition available. + Details
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- Definition Amount of the fee that accompanies borrowing money under the debt instrument. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Contractual interest rate for funds borrowed, under the debt agreement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Date when the debt instrument is scheduled to be fully repaid, in CCYY-MM-DD format. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(2)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Amount of unused borrowing capacity under the long-term financing arrangement that is available to the entity as of the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition For an unclassified balance sheet, the amount as of the balance sheet date of capitalized costs associated with the issuance of debt instruments (for example, legal, accounting, underwriting, printing, and registration costs) that will be charged against earnings over the life of the debt instruments to which such costs pertain. Such amount is before the consideration of accumulated amortization. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28555-108399 + Details
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- Definition For an unclassified balance sheet, the carrying amount (net of accumulated amortization) as of the balance sheet date of capitalized costs associated with the issuance of debt instruments (for example, legal, accounting, underwriting, printing, and registration costs) that will be charged against earnings over the life of the debt instruments to which such costs pertain. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28555-108399 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.17) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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