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Income Taxes (Details 2)
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Reconciliation of provision for income taxes to the amount computed at the Federal statutory rate      
Federal income tax at statutory rate, percent 35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate 35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate 35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate
State taxes, net of Federal benefit, percent 4.10%us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes 4.20%us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes 4.10%us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes
Goodwill impairment, percent 0.20%us-gaap_EffectiveIncomeTaxRateReconciliationNondeductibleExpenseImpairmentLosses 0.00%us-gaap_EffectiveIncomeTaxRateReconciliationNondeductibleExpenseImpairmentLosses 4.60%us-gaap_EffectiveIncomeTaxRateReconciliationNondeductibleExpenseImpairmentLosses
AVC gain, percent 0.00%woof_EffectiveTaxRateReconciliationBusinessCombinationGain 0.00%woof_EffectiveTaxRateReconciliationBusinessCombinationGain (2.60%)woof_EffectiveTaxRateReconciliationBusinessCombinationGain
Foreign rate differential, percent (0.40%)us-gaap_EffectiveIncomeTaxRateReconciliationForeignIncomeTaxRateDifferential (0.40%)us-gaap_EffectiveIncomeTaxRateReconciliationForeignIncomeTaxRateDifferential (1.10%)us-gaap_EffectiveIncomeTaxRateReconciliationForeignIncomeTaxRateDifferential
Miscellaneous, percent 0.20%us-gaap_EffectiveIncomeTaxRateReconciliationOtherAdjustments 0.10%us-gaap_EffectiveIncomeTaxRateReconciliationOtherAdjustments 1.20%us-gaap_EffectiveIncomeTaxRateReconciliationOtherAdjustments
Effective income tax rate, Total percentage 39.10%us-gaap_EffectiveIncomeTaxRateContinuingOperations 38.90%us-gaap_EffectiveIncomeTaxRateContinuingOperations 41.20%us-gaap_EffectiveIncomeTaxRateContinuingOperations