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DEBT (Revolving Credit Agreement) (Details) (USD $)
In Thousands, unless otherwise specified
 1 Months Ended 3 Months Ended 12 Months Ended
Sep. 30, 2014
Dec. 31, 2014
Dec. 31, 2014
Dec. 31, 2013
Debt        
Amounts due banks   $ 61,155us-gaap_ShortTermBankLoansAndNotesPayable $ 61,155us-gaap_ShortTermBankLoansAndNotesPayable $ 14,581us-gaap_ShortTermBankLoansAndNotesPayable
Revolving credit agreement        
Debt        
Borrowing capacity under the line of credit   400,000us-gaap_LineOfCreditFacilityCurrentBorrowingCapacity
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember		 400,000us-gaap_LineOfCreditFacilityCurrentBorrowingCapacity
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember		  
Credit agreement initiation date Sep. 12, 2014      
Credit facility covenant compliance     As of December 31, 2014, the Company was in compliance with all of its covenants  
Amounts due banks   50,000us-gaap_ShortTermBankLoansAndNotesPayable
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember		 50,000us-gaap_ShortTermBankLoansAndNotesPayable
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember		  
Term of the credit agreement (in years)   5 years    
Additional increase in borrowing capacity of the line of credit available at the entity's option   $ 100,000leco_LineOfCreditFacilityAdditionalCapacityIncreaseOption
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember		 $ 100,000leco_LineOfCreditFacilityAdditionalCapacityIncreaseOption
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember