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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