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BUSINESS ACQUISITIONS (Details) | 3 Months Ended | 9 Months Ended |  |  |  | 0 Months Ended |  |  | 0 Months Ended |  |  |
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Sep. 30, 2012 USD ($) | Sep. 30, 2011 USD ($) | Sep. 30, 2012 USD ($) | Sep. 30, 2011 USD ($) | Jul. 11, 2012 USD ($) | Dec. 31, 2011 USD ($) | Oct. 10, 2011 Kenneth Crosby [Member] USD ($) | Dec. 30, 2011 C.W.Rod Tool Company [Member] USD ($) | Jan. 31, 2012 Mid-Continent Safety [Member] USD ($) | Feb. 29, 2012 Pump & Power Equipment, Inc. [Member] USD ($) | May 01, 2012 Industrial Paramedic Services [Member] USD ($) | May 01, 2012 Industrial Paramedic Services [Member] Promissory Notes [Member] USD ($) | Apr. 02, 2012 Aledco, Inc. [Member] USD ($) | Jul. 11, 2012 HSE Integrated Ltd. [Member] USD ($) | Jul. 11, 2012 HSE Integrated Ltd. [Member] CAD
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Purchase price |  |  |  |  |  |  | $ 15,600,000 | $ 41,700,000 | $ 3,800,000 | $ 1,900,000 | $ 24,100,000 |  | $ 8,000,000 | $ 85,000,000 |
Borrowings under existing credit facility |  |  |  |  |  |  | 15,600,000 | 41,700,000 | 3,800,000 | 1,900,000 | 20,600,000 |  | 8,000,000 |  |
Goodwill on acquisition |  |  |  |  |  |  | 5,800,000 | 10,000,000 | 1,200,000 | 700,000 | 11,900,000 |  | 2,900,000 | 22,600,000 |
Purchase price, common stock |  |  |  |  |  |  |  | 1,100,000 |  |  |  |  |  |  |
Number of shares issued on acquisition (in shares) |  |  |  |  |  |  |  | 35,714 |  |  | 19,685 |  |  |  |
Purchase price, cash paid |  |  |  |  |  |  |  | 41,700,000 |  |  |  |  |  |  |
Cash paid in form of checks in connection with a business acquisition |  |  |  |  |  | 36,700,000 |  | 36,700,000 |  |  |  |  |  |  |
Number of locations in which entity operates |  |  |  |  |  |  |  |  |  |  | 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 acquisiton |  |  |  |  |  |  |  |  |  |  |  |  |  | 4,000,000 |
Transaction costs |  |  |  |  |  |  |  |  |  |  |  |  |  | 3,000,000 |
New credit facility, maximum borrowing capacity |  |  |  |  | 325,000,000 |  |  |  |  |  |  |  |  |  |
Sales contributed by acquisitions that occurred subsequent to September 30, 2011 | 66,700,000 |  | 137,600,000 |  |  |  |  |  |  |  |  |  |  |  |
Income before income taxes contributed by acquisitions that occurred subsequent to September 30, 2011 | 3,400,000 |  | 7,400,000 |  |  |  |  |  |  |  |  |  |  |  |
Purchase price allocation [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash | 11,976,000 |  | 11,976,000 |  |  |  |  |  |  |  |  |  |  |  |
Accounts Receivable, net | 49,448,000 |  | 49,448,000 |  |  |  |  |  |  |  |  |  |  |  |
Inventory, net | 16,033,000 |  | 16,033,000 |  |  |  |  |  |  |  |  |  |  |  |
Property and equipment | 29,139,000 |  | 29,139,000 |  |  |  |  |  |  |  |  |  |  |  |
Goodwill and intangibles | 114,814,000 |  | 114,814,000 |  |  |  |  |  |  |  |  |  |  |  |
Other assets | 2,839,000 |  | 2,839,000 |  |  |  |  |  |  |  |  |  |  |  |
Assets acquired | 224,249,000 |  | 224,249,000 |  |  |  |  |  |  |  |  |  |  |  |
Current liabilities assumed | (34,374,000) |  | (34,374,000) |  |  |  |  |  |  |  |  |  |  |  |
Non-current liabilities assumed | (13,753,000) |  | (13,753,000) |  |  |  |  |  |  |  |  |  |  |  |
Net assets acquired | 176,122,000 |  | 176,122,000 |  |  |  |  |  |  |  |  |  |  |  |
Pro Forma Information [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net sales | 293,110,000 | 273,167,000 | 877,091,000 | 781,537,000 |  |  |  |  |  |  |  |  |  |  |
Net income | $ 13,137,000 | $ 11,696,000 | $ 39,233,000 | $ 28,751,000 |  |  |  |  |  |  |  |  |  |  |
Per share data [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basic earnings (in dollars per share) | $ 0.91 | $ 0.81 | $ 2.72 | $ 2.00 |  |  |  |  |  |  |  |  |  |  |
Diluted earnings (in dollars per share) | $ 0.86 | $ 0.77 | $ 2.58 | $ 1.89 |  |  |  |  |  |  |  |  |  |  |

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- Definition The amount of acquisition cost of a business combination allocated to receivables. + 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 b -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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