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Debt default increase in basis spread on interest rate.

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Debt instrument solvency ratio.

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Decrease in consolidated leverage ratio in next twelve months.

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Decrease in consolidated leverage ratio in year two.

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Decrease in consolidated leverage ratio two fiscal years thereafter.

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Line of credit facility payment of customary fees.

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Line of credit facility right to decrease commitment.

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Line of credit facility right to increase commitment.

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Maximum consolidated leverage ratio.

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Maximum debt as proportion of earning before interest tax depreciation and amortization.

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Minimum fixed charge coverage ratio rate.

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The amount of amortization of deferred charges applied against earnings during the period.

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Percentage points added to the reference rate to compute the variable rate on the debt instrument.

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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.

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No definition available.

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Contractual interest rate for funds borrowed, under the debt agreement.

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Amount of unused borrowing capacity under the long-term financing arrangement that is available to the entity as of the balance sheet date.

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Amount of debt issuance costs (for example, but not limited to, legal, accounting, broker, and regulatory fees).

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Weighted average interest rate of debt outstanding.

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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.

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For each line item in the statement of financial position, the amounts of gains and losses from fair value changes included in earnings.

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Amount of the cost of borrowed funds accounted for as interest expense.

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Fair value as of the balance sheet date of all interest rate derivative liabilities designated as cash flow hedging instruments.

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The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

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Amount of current borrowing capacity under the credit facility considering any current restrictions on the amount that could be borrowed (for example, borrowings may be limited by the amount of current assets), but without considering any amounts currently outstanding under the facility.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Maximum amount borrowed under the credit facility at any time during the period.

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Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

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Principal amount of long-term debt and capital lease obligation maturing in the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Principal amount of long-term debt and capital lease obligation maturing in the fourth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Principal amount of long-term debt and capital lease obligation maturing in the third fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Principal amount of long-term debt and capital lease obligation maturing in the second fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Principal amount of long-term debt and capital lease obligation maturing in the next fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Senior Debt - Additional Information (Detail) ¥ in Millions, £ in Millions	12 Months Ended
	Dec. 31, 2015 USD ($)	Dec. 31, 2015 EUR (€)	Dec. 31, 2015 GBP (£)	Dec. 31, 2014 USD ($)	Dec. 31, 2013 USD ($)	Dec. 31, 2015 EUR (€)	Dec. 31, 2015 GBP (£)	Sep. 03, 2015 USD ($)	Dec. 31, 2014 EUR (€)	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 2016	$ 19,500,000
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	$ 108,900,000
Increased credit facility commitment for either revolving credit facility or term loan facility										$ 50,000,000
Weighted average interest rate on outstanding borrowings	3.42%			2.24%		3.42%	3.42%		2.24%
Interest rate swap, fair value	$ 400,000
Changes in fair value income (loss)	$ 400,000
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
Payment of customary fees under credit agreement	2,900,000
Unamortized deferred financing costs	4,200,000			$ 2,400,000
Amortization expense	800,000			600,000	$ 300,000
Debt instrument fees expensed	5,964,000			3,138,000	$ 1,499,000
Aarding Thermal Acoustics B.V. ("Aarding") [Member]
Line Of Credit Facility [Line Items]
Facilities agreement, amount														$ 11,500,000	€ 10,500,000
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	$ 5,300,000			0		€ 4,900,000			€ 0
Weighted average interest rate on outstanding borrowings	1.95%					1.95%	1.95%
Facilities agreement, amount														$ 3,800,000	€ 3,500,000
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
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	$ 56,600,000			71,500,000
Debt instrument fees expensed	300,000
Debenture Agreement [Member] \| United Kingdom [Member]
Line Of Credit Facility [Line Items]
Cash deposit	2,900,000		£ 1.9
Debenture Agreement [Member] \| Germany [Member]
Line Of Credit Facility [Line Items]
Cash deposit	700,000	€ 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	15,400,000			9,500,000
Bank Guarantee Facility [Member] \| Singapore [Member]
Line Of Credit Facility [Line Items]
Aggregate principal amount outstanding under the credit facilities	1,500,000
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	$ 6,600,000			$ 6,000,000		€ 6,100,000			€ 5,500,000
Weighted average interest rate on outstanding borrowings	2.65%					2.65%	2.65%
Facilities agreement, amount														$ 7,600,000	€ 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	$ 9,000,000						£ 6.0
Outstanding stand-by letters of credit and bank guarantees	5,800,000		£ 3.9
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	1,200,000					€ 1,100,000
Outstanding stand-by letters of credit and bank guarantees	$ 1,200,000	€ 1,100,000