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BUSINESS ACQUISITIONS (Details) (USD $) | 3 Months Ended | 9 Months Ended |  |  |  | 0 Months Ended |  |  |  |  | 0 Months Ended |  |  |  |
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Sep. 30, 2013 | Sep. 30, 2012 | Sep. 30, 2013 | Sep. 30, 2012 | Sep. 30, 2013 Minimum [Member] | Sep. 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] | Sep. 30, 2013 National Process Equipment Inc. [Member] | May 17, 2013 Tucker Tool Company, Inc. [Member] | Jun. 30, 2013 Alaska Pump and Supply, Inc. [Member] | Jul. 31, 2013 Tool Tech Industrial Machine and Supply, Inc. [Member]
Purchase price allocation [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash | $ 12,804,000 |  | $ 12,804,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accounts Receivable, net | 53,314,000 |  | 53,314,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Inventory | 12,727,000 |  | 12,727,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property and equipment | 38,421,000 |  | 38,421,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill and intangibles | 139,391,000 |  | 139,391,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other assets | 3,793,000 |  | 3,793,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Assets acquired | 260,450,000 |  | 260,450,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Current liabilities assumed | (49,482,000) |  | (49,482,000) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Non-current liabilities assumed | (22,406,000) |  | (22,406,000) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net assets acquired | 188,562,000 |  | 188,562,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
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 | 13,000,000 | 7,200,000
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 | 62,700,000 |  | 161,400,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Earnings from business acquisitions | 700,000 |  | 3,200,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Pro Forma Information [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net sales | 330,876,000 | 318,895,000 | 970,714,000 | 958,560,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income | $ 16,414,000 | $ 13,363,000 | $ 45,048,000 | $ 40,149,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Per share data [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basic earnings (in dollars per share) | $ 1.14 | $ 0.92 | $ 3.11 | $ 2.78 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Diluted earnings (in dollars per share) | $ 1.07 | $ 0.87 | $ 2.95 | $ 2.63 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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- Definition Amount of acquisition cost of a business combination allocated to other noncurrent assets not separately disclosed. + 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 Emerging Issues Task Force (EITF) -Number 98-1 -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. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 141 -Paragraph 37 -Subparagraph f -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 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 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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