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BUSINESS ACQUISITIONS (Details) (USD $) | 3 Months Ended | 6 Months Ended |  |  |  | 0 Months Ended |  |  |  |  | 0 Months Ended |  |
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Jun. 30, 2013 | Jun. 30, 2012 | Jun. 30, 2013 | Jun. 30, 2012 | Jun. 30, 2013 Minimum [Member] | Jun. 30, 2013 Maximum [Member] | Jan. 31, 2012 Mid Continent Safety [Member] | Feb. 29, 2012 Pump & Power Equipment, Inc. [Member] | Apr. 02, 2012 Aledco, Inc. [Member] | May 01, 2012 Industrial Paramedic Services [Member] location | May 01, 2012 Industrial Paramedic Services [Member] Promissory note [Member] | Jul. 11, 2012 HSE Integrated Ltd. [Member] | May 31, 2012 Austin and Denholm Industrial Sales Alberta, Inc. [Member] | Oct. 01, 2012 Jerzy Supply, Inc. [Member] | Apr. 16, 2013 National Process Equipment Inc. [Member] | Jun. 30, 2013 National Process Equipment Inc. [Member] | May 17, 2013 Tucker Tool Company, Inc. [Member]
Purchase price allocation [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash | $ 12,374,000 |  | $ 12,374,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accounts Receivable, net | 50,385,000 |  | 50,385,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Inventory | 10,985,000 |  | 10,985,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property and equipment | 38,230,000 |  | 38,230,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill and intangibles | 120,817,000 |  | 120,817,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other assets | 3,402,000 |  | 3,402,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Assets acquired | 236,193,000 |  | 236,193,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Current liabilities assumed | (47,243,000) |  | (47,243,000) |  |  |  |  |  |  |  |  |  |  |  |  |  |
Non current liabilities assumed | (20,987,000) |  | (20,987,000) |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net assets acquired | 167,963,000 |  | 167,963,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Purchase price |  |  |  |  |  |  | 3,700,000 | 1,900,000 | 8,100,000 | 25,300,000 |  | 85,000,000 | 2,700,000 | 5,300,000 | 40,100,000 |  | 5,000,000
Borrowings under existing credit facility |  |  |  |  |  |  |  |  |  | 20,600,000 |  |  |  |  | 36,600,000 |  |
Goodwill on acquisition |  |  |  |  |  |  | 1,200,000 | 700,000 | 3,400,000 | 12,100,000 |  | 27,600,000 | 300,000 | 0 | 25,800,000 |  | 3,600,000
Number of shares issued on acquisition (in shares) |  |  |  |  |  |  |  |  |  | 19,685 |  |  |  |  | 52,542 |  |
Number of operating locations |  |  |  |  |  |  |  |  |  | 3 |  |  |  |  |  |  |
Borrowings under notes |  |  |  |  |  |  |  |  |  |  | 2,500,000 |  |  |  |  |  |
Stated interest rate (in hundredths) |  |  |  |  |  |  |  |  |  |  | 5.00% |  |  |  |  |  |
Share price (in dollars per share) |  |  |  |  |  |  |  |  |  |  |  | $ 1.80 |  |  |  |  |
Liabilities assumed on acquisition |  |  |  |  |  |  |  |  |  |  |  | 4,000,000 |  |  |  |  |
Transaction cost |  |  |  |  |  |  |  |  |  |  |  | 3,000,000 |  |  |  |  |
Earnout amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 6,000,000 |  |
Fair value of earnout recorded at acquisition date |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,900,000 |  |
Earnout liability |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,900,000 |
Discount rate for valuation of acquired intangibles (in hundredths) |  |  |  |  | 15.90% | 18.00% |  |  |  |  |  |  |  |  |  |  |
Sales from business acquisitions | 55,300,000 |  | 98,700,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Earnings from business acquisitions | 400,000 |  | 2,500,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Pro Forma Information [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net sales | 312,326,000 | 313,222,000 | 625,464,000 | 625,734,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Net income | $ 13,834,000 | $ 12,902,000 | $ 27,781,000 | $ 26,275,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Per share data [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basic earnings (in dollars per share) | $ 0.96 | $ 0.89 | $ 1.92 | $ 1.82 |  |  |  |  |  |  |  |  |  |  |  |  |
Diluted earnings (in dollars per share) | $ 0.91 | $ 0.85 | $ 1.82 | $ 1.73 |  |  |  |  |  |  |  |  |  |  |  |  |

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- Definition The amount of acquisition cost of a business combination allocated to property, plant and equipment to be used in ongoing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 141 -Paragraph 51 -Subparagraph e -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 141 -Paragraph 37 -Subparagraph d -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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- Definition For an acquired entity, price of a single share of a number of saleable stocks of a company. + References No definition available. + Details
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- Definition The pro forma net Income or Loss for the period as if the business combination or combinations had been completed at the beginning of a period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(2)-(3) -URI http://asc.fasb.org/extlink&oid=7659399&loc=d3e1392-128463 + Details
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- Definition The pro forma revenue for a period as if the business combination or combinations had been completed at the beginning of the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(2)-(3) -URI http://asc.fasb.org/extlink&oid=7659399&loc=d3e1392-128463 + Details
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- Definition The amount, measured at acquisition-date fair value, of all liabilities assumed that arise from contingencies and were recognized by the entity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(1) -URI http://asc.fasb.org/extlink&oid=6910749&loc=d3e4845-128472 + Details
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- Definition This element represents the amount of earnings or loss of the acquiree since the acquisition date included in the consolidated income statement for the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1) -URI http://asc.fasb.org/extlink&oid=7659399&loc=d3e1392-128463 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 141R -Paragraph 68 -Subparagraph r(1) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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- Definition This element represents the amount of revenue of the acquiree since the acquisition date included in the consolidated income statement for the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1) -URI http://asc.fasb.org/extlink&oid=7659399&loc=d3e1392-128463 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 141R -Paragraph 68 -Subparagraph r(1) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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- Definition Interest rate stated in the contractual debt agreement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Fair value of the amount outstanding under the credit facility. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=7491637&loc=d3e13433-108611 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=7491637&loc=d3e13476-108611 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 107 -Paragraph 10 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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