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Debt - Additional Information (Detail) (USD $)
1 Months Ended 3 Months Ended 9 Months Ended 1 Months Ended 1 Months Ended 9 Months Ended 12 Months Ended 1 Months Ended
Nov. 30, 2010
Sep. 30, 2012
Sep. 30, 2011
Mar. 31, 2011
Sep. 30, 2012
Sep. 30, 2011
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2011
Jul. 13, 2011
Nov. 23, 2010
Jul. 31, 2011
Credit Agreement
Sep. 30, 2012
Credit Agreement
Jul. 13, 2011
Credit Agreement
Sep. 30, 2012
Bank Term Loan
Jul. 31, 2012
Bank Term Loan
Cash Flow Hedging
Subsequent Event
Jul. 31, 2011
Amended Credit Facility
Sep. 30, 2012
Amended Credit Facility
Dec. 31, 2011
Amended Credit Facility
Jul. 13, 2011
Amended Credit Facility
Jul. 31, 2011
Amended Credit Facility
Minimum
Jul. 31, 2011
Amended Credit Facility
Maximum
Jul. 13, 2011
Amended Credit Facility
Federal Funds Rate
Jul. 13, 2011
Amended Credit Facility
One Month LIBOR
Jul. 13, 2011
Amended Credit Facility
Bank Term Loan
Jul. 13, 2011
Eurocurrency loans
Credit Agreement
Debt Instrument [Line Items]                                                    
Credit agreement, maximum borrowing capacity                     $ 165,000,000                 $ 265,000,000         $ 100,000,000  
Credit agreement, agreement period                                       5 years            
Credit agreement, maturity date Nov. 23, 2014                               Jul. 13, 2016                  
Reduction in interest costs                                       0.25%            
Size of permitted acquisitions                     25,000,000                 100,000,000            
Permitted additional indebtedness                     20,000,000                 120,000,000            
Revolving credit outstanding borrowings                   100,000,000               13,500,000                
Debt Instrument Lower Range Basis Spread On Variable Rate                           0.75%                 0.50%      
Debt Instrument Higher Range Basis Spread On Variable Rate                           1.50%                   1.00%    
Line of credit, interest rate description                       The base reference rate is the greater of the prime rate; federal funds effective rate plus 50 basis points; and adjusted London interbank offered (“LIBO”) rate plus 100 basis points.                            
Line of credit, LIBOR rate, minimum spread                                                   1.75%
Line of credit, LIBOR rate, maximum spread                                                   2.50%
Unused commitment fee percentage                                         0.20% 0.35%        
Payments commencement date                                 Sep. 30, 2011                  
Covenants, leverage ratio                         3.0                          
Leverage ratio   1.55     1.55                                          
Fixed Charge Coverage Ratio Minimum   1.93     1.93   2.09 2.27 2.60                                  
Capitalized debt issuance costs   100,000     100,000           2,300,000                              
Amortization expense, debt issue costs   100,000 100,000   400,000 400,000                                        
Capitalized debt issuance costs, net   1,900,000     1,900,000                                          
Amount drawn on the line of credit to fund the acquisition of Curamik       145,000,000                                            
Repayment of debt principal         17,242,000 16,250,000                       16,500,000 22,500,000              
Required payment on debt obligation within the next 12 months                                   11,300,000                
Repayments of Lines of Credit         5,500,000                                          
Term loan debt                             92,500,000     92,500,000                
Total outstanding debt   106,000,000     106,000,000                                          
LIBOR in Effect at Period End   0.25%     0.25%                                          
Interest rate spread over variable rate   2.25%     2.25%                   2.25%                      
Irrevocable standby letters of credit   1,100,000     1,100,000                                          
Letter guarantee   700,000     700,000                                          
Option to buy out capital lease, year         2013                                          
Capital lease, expiration date         2021                                          
Capital lease obligation   8,400,000     8,400,000                                          
Amortization expense related to the capital lease   100,000 100,000   300,000 300,000                                        
Interest expense on outstanding debt   800,000 800,000   2,300,000 2,900,000                                        
Unused commitment fee   100,000 100,000   300,000 100,000                                        
Interest rate swap derivative, percentage of debt hedged                               65.00%                    
Interest expense on capital lease   $ 300,000 $ 200,000   $ 1,100,000 $ 900,000