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Acquisition of Professional Power Products Inc - Additional Information (Detail) (USD $)
 3 Months Ended 6 Months Ended 0 Months Ended 3 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Wells Fargo Bank, N.A [Member]
Jun. 30, 2014
Minimum [Member]
Wells Fargo Bank, N.A [Member]
Jun. 30, 2014
Maximum [Member]
Wells Fargo Bank, N.A [Member]
Apr. 01, 2014
Professional Power Products Inc. ("PPPI") [Member]
Jun. 30, 2014
Professional Power Products Inc. ("PPPI") [Member]
Apr. 01, 2014
Professional Power Products Inc. ("PPPI") [Member]
Loans At Acquisition Date [Line Items]                    
Business acquisition net of cash paid     $ 44,122,000         $ 45,400,000    
Business acquisition cash acquired               1,300,000    
Contingent consideration value 900,000   900,000         8,900,000    
Contingent consideration initial purchase price               54,300,000    
Contingent consideration minimum payable value                   5,000,000
Contingent consideration maximum payable value                   15,000,000
Common stock issued to seller, price per share                   $ 76.02
Business acquisition agreement date     Apr. 01, 2014              
Total transaction cost related to acquisition 811,000   811,000              
Increased line of credit           75,000,000 90,000,000      
Securing term loan         5,000,000          
Increased finished goods inventory     18,455,000 8,580,000            
Net Intercompany sales                 7,272,000  
Operating Income Loss 5,893,000 3,840,000 9,414,000 6,920,000         31,000  
Amortization expense                 $ 555,000