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BUSINESS ACQUISITIONS (Details)
 12 Months Ended 0 Months Ended 0 Months Ended 12 Months Ended
Dec. 31, 2013
USD ($)
Dec. 31, 2012
USD ($)
Dec. 31, 2013
Minimum [Member]
Dec. 31, 2013
Maximum [Member]
Jan. 31, 2012
Mid-Continent Safety [Member]
USD ($)
Feb. 29, 2012
Pump & Power Equipment, Inc. [Member]
USD ($)
Apr. 02, 2012
Aledco, Inc. [Member]
USD ($)
May 01, 2012
Industrial Paramedic Services [Member]
USD ($)
Location
May 01, 2012
Industrial Paramedic Services [Member]
Promissory note [Member]
USD ($)
Jul. 11, 2012
HSE Integrated Ltd. [Member]
USD ($)
Jul. 11, 2012
HSE Integrated Ltd. [Member]
CAD
May 31, 2012
Austin and Denholm Industrial Sales Alberta, Inc. [Member]
USD ($)
Oct. 01, 2012
Jerzy Supply, Inc. [Member]
USD ($)
Jun. 30, 2013
Alaska Pump and Supply, Inc. [Member]
USD ($)
Jul. 31, 2013
Tool Tech Industrial Machine and Supply, Inc. [Member]
USD ($)
Apr. 16, 2013
National Process Equipment Inc. [Member]
USD ($)
Sep. 30, 2013
National Process Equipment Inc. [Member]
USD ($)
May 17, 2013
Tucker Tool Company, Inc. [Member]
USD ($)
Dec. 31, 2012
Units acquired in 2011 and 2012 [Member]
USD ($)
Dec. 31, 2011
Units acquired in 2011 and 2012 [Member]
USD ($)
Dec. 31, 2013
Units acquired in 2012 and 2013 [Member]
USD ($)
Dec. 31, 2012
Units acquired in 2012 and 2013 [Member]
USD ($)
Purchase price allocation [Abstract]                                            
Cash $ 12,804,000                                          
Accounts Receivable, net 53,314,000                                          
Inventory, net 12,727,000                                          
Property and equipment 38,421,000                                          
Goodwill and intangibles 139,391,000                                          
Other assets 3,793,000                                          
Assets acquired 260,450,000                                          
Current liabilities assumed (49,482,000)                                          
Non current liabilities assumed (22,406,000)                                          
Net assets acquired 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 13,000,000 7,200,000 40,100,000   5,000,000        
Borrowings under existing credit facility               20,600,000               36,600,000            
Goodwill on acquisition         1,100,000 700,000 3,400,000 12,300,000   27,900,000   300,000 600,000 8,100,000 4,100,000 24,600,000   3,200,000        
Intangible assets on acquisition         1,800,000 800,000 3,100,000 9,900,000   8,800,000   600,000 2,000,000 4,100,000 2,400,000 14,800,000   1,500,000        
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)                     1.8                      
Liabilities assumed on acquisiton                   4,000,000                        
Transaction cost                   3,000,000                        
Earnout amount                               6,000,000            
Earnout liability                                 2,800,000          
Fair value of earnout recorded at acquisition date                               2,800,000            
Discount rate for valuation of acquired intangibles (in hundredths)     15.90% 18.70%                                    
Sales from business acquisitions 63,700,000 162,700,000                                        
Earnings from business acquisitions 1,400,000 7,200,000                                        
Pro Forma Information [Abstract]                                            
Net sales                                     1,177,091,000 1,062,540,000 1,284,465,000 1,279,870,000
Net income                                     $ 54,033,000 $ 41,359,000 $ 61,929,000 $ 55,309,000
Per share data [Abstract]                                            
Basic earnings (in dollars per share)                                     $ 3.75 $ 2.88 $ 4.28 $ 3.83
Diluted earnings (in dollars per share)                                     $ 3.55 $ 2.72 $ 4.05 $ 3.62