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Pension and Employee Benefit Plans - Additional Information (Detail) (USD $)
 12 Months Ended
Dec. 31, 2013
Plans
Dec. 31, 2012
Dec. 31, 2013
Maximum [Member]
Equity securities [Member]
Dec. 31, 2013
Maximum [Member]
Debt securities [Member]
Dec. 31, 2013
Minimum [Member]
Equity securities [Member]
Dec. 31, 2013
Minimum [Member]
Debt securities [Member]
Dec. 31, 2014
Scenario, Forecast [Member]
Dec. 31, 2013
Health care plan [Member]
Dec. 31, 2012
Health care plan [Member]
Dec. 31, 2013
Pension plan [Member]
Dec. 31, 2013
Yellow Zone [Member]
Dec. 31, 2013
Red Zone [Member]
Dec. 31, 2013
Green Zone [Member]
Dec. 31, 2013
Met-Pro Technologies LLC ("Met-Pro") [Member]
Dec. 31, 2013
Met-Pro Technologies LLC ("Met-Pro") [Member]
Maximum [Member]
Dec. 31, 2013
Met-Pro Technologies LLC ("Met-Pro") [Member]
Minimum [Member]
Defined Benefit Plan Disclosure [Line Items]                                
Number Of Defined Benefit Pension Plans, acquired 2                              
Increase (decrease) in minimum liability after tax of defined benefit plans $ (1,400,000) $ 21,000                            
Current Assets Mix percentage 100.00% 100.00% 70.00% 40.00% 60.00% 30.00%                    
Assumed average annual returns 7.50% 7.50% 12.00% 6.00% 8.00% 4.00%                    
Net loss for the defined benefit pension plan to be amortized in next year               (11,000)   200,000            
Prior service cost for the defined benefit pension plan to be amortized in next year               6,000   1,000            
Weighted average discount rate to determine the net periodic benefit cost               3.75% 4.25%              
Net periodic benefit cost 301,000 342,000           (11,000) (3,000)              
Estimated pension plan cash obligations payable in 2014               21,000   1,600,000            
Estimated pension plan cash obligations payable in 2015               19,000   1,700,000            
Estimated pension plan cash obligations payable in 2016               17,000   1,800,000            
Estimated pension plan cash obligations payable in 2017               15,000   1,800,000            
Estimated pension plan cash obligations payable in 2018               13,000   1,900,000            
Estimated pension plan cash obligations payable in 2019 through 2023               41,000   10,200,000            
Plans Funded Status Description                     Between 65 and less than 80 percent Less than 65 percent At least 80 percent      
Listing under plans Forms 5500 as providing more than 5% contribution false                              
Liability has been provided in the accompanying consolidated financial statements 0                              
Amounts charged to pension expense 1,600,000 1,800,000                            
Profit sharing and 401(k) savings retirement plan for non-union employees Description The plan covers substantially all employees who have 30 days of service, completed 1,000 hours of service and who have attained 18 years of age.                              
Description Increase in matching contributions We increased, effective January 1, 2008, the matching contributions to 100% of the first 1% and 50% of the next 5% of the employee deferral for a maximum match of 3.5%.                              
Employer Matching Contribution on First one percent in 2012 & 2013 and three percent in 2014 100.00% 100.00%         100.00%             4.00%    
Employer Matching Contribution on Next Five percent in 2012 & 2013 and three percent in 2014 50.00% 50.00%         50.00%                  
Employer Matching Contribution per employee on Next percentage 5.00% 5.00%         3.00%                  
Employer Maximum Matching Contribution Percent Of Employee Salary Deferral 3.50% 3.50%         4.50%                  
Percentage of Employee salary deferral provision 100.00%                              
Aggregate matching contributions and discretionary contributions Amount 400,000 400,000                            
Employees contribution to profit sharing plan                           25.00%    
Employer Matching Contribution                           50.00%    
Percentage of employer discretionary contribution                             4.00% 2.00%
Total cash contribution by employer                           $ 200,000