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Senior Debt - Additional Information (Detail) ¥ in Millions, £ in Millions | 3 Months Ended |  |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Mar. 31, 2016 USD ($) | Mar. 31, 2016 EUR (€) | Mar. 31, 2016 GBP (£) | Mar. 31, 2015 USD ($) | Mar. 31, 2016 EUR (€) | Mar. 31, 2016 GBP (£) | Dec. 31, 2015 USD ($) | Dec. 31, 2015 EUR (€) | Sep. 03, 2015 USD ($) | Nov. 18, 2014 USD ($) | Aug. 27, 2013 USD ($) | Dec. 31, 2012 USD ($) | Dec. 31, 2012 CNY (¥) | Aug. 17, 2012 USD ($) | Aug. 17, 2012 EUR (€)
Line Of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term debt, principal payment remainder of 2016 | $ 14,500,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term debt, principal payment 2017 | 13,800,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term debt, principal payment 2018 | 18,100,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term debt, principal payment 2019 | 21,300,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term debt, principal payment 2020 | $ 106,900,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Increased credit facility commitment for either revolving credit facility or term loan facility |  |  |  |  |  |  |  |  |  | $ 50,000,000 |  |  |  |  |
Weighted average interest rate on outstanding borrowings | 3.44% |  |  |  | 3.44% | 3.44% | 3.42% | 3.42% |  |  |  |  |  |  |
Interest rate swap, fair value | $ 1,100,000 |  |  |  |  |  | $ 400,000 |  |  |  |  |  |  |  |
Changes in fair value income (loss) | $ 500,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum consolidated leverage ratio | 375.00% |  |  |  | 375.00% | 375.00% |  |  |  |  |  |  |  |  |
Minimum fixed charge coverage ratio | 125.00% | 125.00% | 125.00% |  |  |  |  |  |  |  |  |  |  |  |
Increased interest rate of loan due to default | 2.00% |  |  |  | 2.00% | 2.00% |  |  |  |  |  |  |  |  |
Decrease in consolidated leverage ratio in next twelve months | 350.00% |  |  |  | 350.00% | 350.00% |  |  |  |  |  |  |  |  |
Decrease in consolidated leverage ratio in year two | 300.00% |  |  |  | 300.00% | 300.00% |  |  |  |  |  |  |  |  |
Decrease in consolidated leverage ratio thereafter | 300.00% |  |  |  | 300.00% | 300.00% |  |  |  |  |  |  |  |  |
Other expenses for credit agreement | $ 6,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unamortized deferred financing costs | 4,000,000 |  |  |  |  |  | 4,200,000 |  |  |  |  |  |  |  |
Amortization expense | 200,000 |  |  | $ 100,000 |  |  |  |  |  |  |  |  |  |  |
Aarding Thermal Acoustics B.V. ("Aarding") [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line Of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Facilities agreement, amount |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 14,800,000 | € 13,000,000
Maximum debt as proportion of EBITDA |  |  |  |  |  |  |  |  |  |  |  |  |  | 3.00% | 3.00%
Aarding Thermal Acoustics B.V. ("Aarding") [Member] | Bank Overdrafts [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line Of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate principal amount outstanding under the credit facilities | $ 3,500,000 |  |  |  | € 3,100,000 |  | 5,600,000 | € 4,900,000 |  |  |  |  |  |  |
Weighted average interest rate on outstanding borrowings | 2.50% |  |  |  | 2.50% | 2.50% |  |  |  |  |  |  |  |  |
Facilities agreement, amount |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 6,800,000 | € 6,000,000
Debt instrument variable interest rate description | Three months Euribor plus 250 basis points | Three months Euribor plus 250 basis points | Three months Euribor plus 250 basis points |  |  |  |  |  |  |  |  |  |  |  |
Minimum [Member] | Aarding Thermal Acoustics B.V. ("Aarding") [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line Of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowers solvency ratio |  |  |  |  |  |  |  |  |  |  |  |  |  | 30.00% | 30.00%
Cross Currency Interest Rate Contract [Member] | Minimum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line Of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate | 2.00% | 2.00% | 2.00% |  |  |  |  |  |  |  |  |  |  |  |
Cross Currency Interest Rate Contract [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line Of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate | 3.00% | 3.00% | 3.00% |  |  |  |  |  |  |  |  |  |  |  |
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% |  |  |  |  |  |  |  |  |  |  |  |
Base Rate [Member] | Minimum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line Of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate | 1.00% | 1.00% | 1.00% |  |  |  |  |  |  |  |  |  |  |  |
Base Rate [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line Of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate | 2.00% | 2.00% | 2.00% |  |  |  |  |  |  |  |  |  |  |  |
Credit Agreement [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line Of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unused credit availability under credit facility | $ 61,100,000 |  |  |  |  |  | 56,600,000 |  |  |  |  |  |  |  |
Debenture Agreement [Member] | United Kingdom [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line Of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash deposit | 2,900,000 |  | £ 2.0 |  |  |  |  |  |  |  |  |  |  |  |
Debenture Agreement [Member] | Germany [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line Of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash deposit | 800,000 | € 700,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Term Loan [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line Of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowing capacity under credit facility |  |  |  |  |  |  |  |  |  |  | $ 65,000,000 |  |  |  |
Increased credit facility commitment for either revolving credit facility or term loan facility |  |  |  |  |  |  |  |  | $ 170,000,000 | 35,000,000 |  |  |  |  |
Term Loan [Member] | Met-Pro [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line Of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowing capacity under credit facility |  |  |  |  |  |  |  |  |  |  | 65,000,000 |  |  |  |
U.S. Dollar Revolving Loans [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line Of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowing capacity under credit facility |  |  |  |  |  |  |  |  |  |  | 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 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line Of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowing capacity under credit facility |  |  |  |  |  |  |  |  |  |  | 52,000,000 |  |  |  |
Multi-currency Revolving Credit Facility [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line Of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowing capacity under credit facility |  |  |  |  |  |  |  |  |  |  | $ 19,500,000 |  |  |  |
Letters of Credit [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line Of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate principal amount outstanding under the credit facilities | 12,900,000 |  |  |  |  |  | 15,400,000 |  |  |  |  |  |  |  |
Bank Guarantee Facility [Member] | Singapore [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line Of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate principal amount outstanding under the credit facilities | 1,600,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash deposit | 500,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Bank Guarantee Facility [Member] | Aarding Thermal Acoustics B.V. ("Aarding") [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line Of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate principal amount outstanding under the credit facilities | $ 1,900,000 |  |  |  | € 1,700,000 |  | $ 6,900,000 | € 6,100,000 |  |  |  |  |  |  |
Weighted average interest rate on outstanding borrowings | 2.65% |  |  |  | 2.65% | 2.65% |  |  |  |  |  |  |  |  |
Facilities agreement, amount |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 8,000,000 | € 7,000,000
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 |  |  |  |  |  |  |  |  |  |  |  |
China Facility [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line Of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate principal amount outstanding under the credit facilities |  |  |  |  |  |  |  |  |  |  |  | $ 1,400,000 | ¥ 9.0 |  |
Interest rate |  |  |  |  |  |  |  |  |  |  |  | 4.79% | 4.79% |  |
Letter Of Credit And Bank Guarantees [Member] | Debenture Agreement [Member] | United Kingdom [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line Of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate principal amount outstanding under the credit facilities | $ 8,600,000 |  |  |  |  | £ 6.0 |  |  |  |  |  |  |  |  |
Outstanding stand-by letters of credit and bank guarantees | 6,800,000 |  | £ 4.7 |  |  |  |  |  |  |  |  |  |  |  |
Letter Of Credit And Bank Guarantees [Member] | Debenture Agreement [Member] | Germany [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line Of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate principal amount outstanding under the credit facilities | 1,300,000 |  |  |  | € 1,100,000 |  |  |  |  |  |  |  |  |  |
Outstanding stand-by letters of credit and bank guarantees | $ 1,300,000 | € 1,100,000 |  |  |  |  |  |  |  |  |  |  |  |  |

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