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Pension and Employee Benefit Plans - Additional Information (Detail) (USD $) | 12 Months Ended
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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 |  |

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- Definition An assumption as to the rate of return on plan assets reflecting the average rate of earnings expected on the funds invested or to be invested to provide for the benefits included in the benefit obligation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 30 -Glossary Expected Long-Term Rate of Return on Plan Assets -URI http://asc.fasb.org/extlink&oid=6512013 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (k)(3) -URI http://asc.fasb.org/extlink&oid=28361610&loc=d3e1928-114920 + Details
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- Definition Descriptive information regarding the employer's best estimate, as soon as it can be reasonably determined, of contributions expected to be paid in the current remaining fiscal period. Estimated contributions may be presented in the aggregate combining (1) contributions required by funding regulations or laws, (2) discretionary contributions, and (3) noncash contributions. Description may include a range of expected contributions, required minimum contribution, whether the expected contribution is discretionary, and further explanation. + References No definition available. + Details
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- Definition Amount included in accumulated other comprehensive income (AOCI) related to gain (loss) expected to be recognized as components of net periodic benefit cost for the fiscal year that follows the most recent annual statement of financial position. + References No definition available. + Details
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- Definition The total amount of net periodic benefit cost for defined benefit plans for the period. Periodic benefit costs include the following components: service cost, interest cost, expected return on plan assets, gain (loss), prior service cost or credit, transition asset or obligation, and gain (loss) due to settlements or curtailments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h) -URI http://asc.fasb.org/extlink&oid=28361610&loc=d3e1928-114920 + Details
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- Definition Percentage of fair value of investments (categorized by debt securities, equity securities, real estate and other plan assets) to the fair value of plan assets held. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 5 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=28361610&loc=d3e2446-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(1) -URI http://asc.fasb.org/extlink&oid=28361610&loc=d3e1928-114920 + Details
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- Definition Description of the terms and benefits provided by the employer's defined contribution plans. A defined contribution plan provides benefits in return for services rendered, provides an individual account for each participant, and has terms that specify how contributions to the individual's account are to be determined rather than the amount of benefits the individual is to receive. Under a defined contribution pension plan, the benefits a participant will receive depend solely on the amount contributed to the participant's account, the returns earned on investments of those contributions, and forfeitures of other participants' benefits that may be allocated to such participant's account. A description of the plan(s) including employee groups covered, the basis for determining contributions, and the nature and effects of significant matters affecting comparability of information for all periods presented. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 70 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6414718&loc=d3e28014-114942 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Defined Contribution Postretirement Plan -URI http://asc.fasb.org/extlink&oid=6510416 + Details
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- Definition Amount of accumulated benefit obligation attributable to the pension or postretirement benefit plan to which two or more unrelated employers contribute where assets contributed by one participating employer may be used to provide benefits to employees of other participating employers. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 80 -Section 50 -Paragraph 7 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=14450570&loc=SL14450678-114947 + Details
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