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BUSINESS ACQUISITIONS (Details) (USD $)
 3 Months Ended 9 Months Ended 0 Months Ended 0 Months Ended
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