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Share-Based Compensation (Schedule Of Selected Financial Impact Of Share-Based Compensation) (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Income tax benefit resulting from share-based compensation arrangements $ (6,107)us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense $ (5,584)us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense $ (5,403)us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense
Net impact of share-based compensation on net income 11,992us-gaap_AllocatedShareBasedCompensationExpenseNetOfTax 10,990us-gaap_AllocatedShareBasedCompensationExpenseNetOfTax 10,519us-gaap_AllocatedShareBasedCompensationExpenseNetOfTax
Cost Of Revenue [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based compensation expense 1,937us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_CostOfSalesMember		 1,841us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_CostOfSalesMember		 1,770us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_CostOfSalesMember
Operating Expenses [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based compensation expense 16,162us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_IncomeStatementLocationAxis
= idxx_OperatingExpensesMember		 14,733us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_IncomeStatementLocationAxis
= idxx_OperatingExpensesMember		 14,152us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_IncomeStatementLocationAxis
= idxx_OperatingExpensesMember
Total Share-Based Compensation Expense Included In Consolidated Statements Of Income [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based compensation expense $ 18,099us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_IncomeStatementLocationAxis
= idxx_TotalShareBasedCompensationExpenseIncludedInConsolidatedStatementsOfIncomeMember		 $ 16,574us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_IncomeStatementLocationAxis
= idxx_TotalShareBasedCompensationExpenseIncludedInConsolidatedStatementsOfIncomeMember		 $ 15,922us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_IncomeStatementLocationAxis
= idxx_TotalShareBasedCompensationExpenseIncludedInConsolidatedStatementsOfIncomeMember