Purchase price was financed with a combination of cash on hand and borrowings.

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Increased value of 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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Amount of direct costs of the business combination including legal, accounting, and other costs incurred to consummate the business acquisition.

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This element represents the amount of any measurement period adjustment (as defined) realized during the reporting period to items of consideration transferred in connection with a business combination for which the initial accounting was incomplete.

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Amount of currency on hand as well as demand deposits with banks or financial institutions, acquired at the acquisition date. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.

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Cost of materials used in goods produced and sold during the reporting period.

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The net result for the period of deducting operating expenses from operating revenues.

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The cash outflow associated with the acquisition of business during the period. The cash portion only of the acquisition price.

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Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

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Total revenue from sale of goods and services rendered during the reporting period, in the normal course of business, reduced by sales returns and allowances, and sales discounts.

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Acquisitions (Additional Information) (Detail) (USD $)	3 Months Ended								12 Months Ended			0 Months Ended
Acquisitions (Additional Information) (Detail) (USD $)	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Feb. 20, 2014	Feb. 18, 2014
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Cash acquired	$ 7,493,000								$ 7,493,000
Acquisition related transaction costs	2,600,000								2,600,000
Net sales	127,583,000us-gaap_SalesRevenueNet	134,227,000us-gaap_SalesRevenueNet	148,793,000us-gaap_SalesRevenueNet	125,226,000us-gaap_SalesRevenueNet	99,894,000us-gaap_SalesRevenueNet	97,995,000us-gaap_SalesRevenueNet	101,051,000us-gaap_SalesRevenueNet	99,029,000us-gaap_SalesRevenueNet	535,829,000us-gaap_SalesRevenueNet	397,969,000us-gaap_SalesRevenueNet	378,924,000us-gaap_SalesRevenueNet
Operating Income (Loss)									34,048,000us-gaap_OperatingIncomeLoss	28,713,000us-gaap_OperatingIncomeLoss	21,378,000us-gaap_OperatingIncomeLoss
Industrial Filtration [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Net sales									112,200,000
Operating Income (Loss)									6,400,000
Cost of sales									2,100,000
Andrew Industries Limited [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Payments to Acquire Businesses, Gross												86,900,000
Cash acquired												7,500,000
Post-closing adjustment payment		200,000										200,000
Purchase price borrowings												60,000,000
Acquisition-related Costs [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Revenues									2,600,000	2,600,000
Fair Value Adjustment to Inventory [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Revenues									2,100,000	2,600,000
Interest Expense Associated with Borrowings Under the Company's Amended Credit Facility [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Revenues										900,000
Excluded Acquisition-related Costs [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Revenues										1,200,000
Amended Credit Facility [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Line Of Credit Facility Maximum Borrowing Capacity Increased Value													$ 100,000,000