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Summary of Significant Accounting Policies (Details Textual) (USD $)
 12 Months Ended
Dec. 31, 2014
unit
State
province
Dec. 31, 2013
Dec. 31, 2012
Sep. 30, 2013
Dec. 31, 2011
Summary of Significant Accounting Policies (Textual) [Abstract]          
Number of states in which management services are provided to animal hospitals 15woof_NumberOfStatesInWhichManagementServicesAreProvidedToAnimalHospitals        
Number of Canadian Provinces in which entity operates 4woof_NumberofCanadianProvincesinwhichEntityOperates        
Maturity period of cash equivalents
less than 90 days
        
Depreciation and amortization expense $ 79,427,000us-gaap_DepreciationDepletionAndAmortization $ 77,409,000us-gaap_DepreciationDepletionAndAmortization $ 76,227,000us-gaap_DepreciationDepletionAndAmortization    
Accumulated depreciation on buildings and equipment held under capital leases 352,212,000us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment 314,498,000us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment      
Number of reporting units 5us-gaap_NumberOfReportingUnits        
Impairment of goodwill and other long-lived assets   9,246,000us-gaap_GoodwillImpairmentLoss      
Asset impairment charge 13,100,000us-gaap_ImpairmentOfIntangibleAssetsFinitelived        
Likelihood of benefit amount being realized upon settlement in order to be recognized as a tax benefit greater than 50%        
Unrecognized Tax Benefit We did not have any unrecognized tax benefits        
Accumulated amortization of deferred financing cost 1,400,000us-gaap_AccumulatedAmortizationDeferredFinanceCosts 1,200,000us-gaap_AccumulatedAmortizationDeferredFinanceCosts      
Valuation allowances recorded 19,846,000us-gaap_ValuationAllowancesAndReservesBalance 17,702,000us-gaap_ValuationAllowancesAndReservesBalance 16,546,000us-gaap_ValuationAllowancesAndReservesBalance   14,978,000us-gaap_ValuationAllowancesAndReservesBalance
Total marketing and advertising expense included in direct costs 23,900,000woof_MarketingAndAdvertisingExpensesDirectCost 25,400,000woof_MarketingAndAdvertisingExpensesDirectCost 25,300,000woof_MarketingAndAdvertisingExpensesDirectCost    
Total marketing and advertising expenses included in selling, general and administrative expense 6,800,000woof_MarketingAndAdvertisingExpenseIncludedInSellingGeneralAndAdministrative 5,900,000woof_MarketingAndAdvertisingExpenseIncludedInSellingGeneralAndAdministrative 7,600,000woof_MarketingAndAdvertisingExpenseIncludedInSellingGeneralAndAdministrative    
Accrued warranty costs 0us-gaap_ProductWarrantyAccrual 100,000us-gaap_ProductWarrantyAccrual      
Common shares excluded from the computation of diluted earnings per share 31,668us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount 43,300us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount 1,000,000us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount    
Inventory adjustments   2,800,000us-gaap_InventoryAdjustments   2,800,000us-gaap_InventoryAdjustments  
Depreciation expense adjustment     3,100,000woof_DepreciationExpenseAdjustment    
Minimum [Member]          
Summary of Significant Accounting Policies (Textual) [Abstract]          
Interest rate on note receivable (percentage) 2.60%woof_NoteReceivableInterestRate
/ us-gaap_RangeAxis
= us-gaap_MinimumMember		        
Maximum [Member]          
Summary of Significant Accounting Policies (Textual) [Abstract]          
Interest rate on note receivable (percentage) 7.50%woof_NoteReceivableInterestRate
/ us-gaap_RangeAxis
= us-gaap_MaximumMember		        
Assets Held under Capital Leases [Member]          
Summary of Significant Accounting Policies (Textual) [Abstract]          
Depreciation and amortization expense 58,400,000us-gaap_DepreciationDepletionAndAmortization
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_AssetsHeldUnderCapitalLeasesMember		 56,500,000us-gaap_DepreciationDepletionAndAmortization
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_AssetsHeldUnderCapitalLeasesMember		 53,500,000us-gaap_DepreciationDepletionAndAmortization
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_AssetsHeldUnderCapitalLeasesMember		    
Accumulated depreciation on buildings and equipment held under capital leases 17,000,000us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_AssetsHeldUnderCapitalLeasesMember		 13,700,000us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_AssetsHeldUnderCapitalLeasesMember		      
Notes Receivable [Member]          
Summary of Significant Accounting Policies (Textual) [Abstract]          
Valuation allowances recorded 0us-gaap_ValuationAllowancesAndReservesBalance
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_NotesReceivableMember		 0us-gaap_ValuationAllowancesAndReservesBalance
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_NotesReceivableMember		      
Other Segments [Member]          
Summary of Significant Accounting Policies (Textual) [Abstract]          
Depreciation and amortization expense 6,940,000us-gaap_DepreciationDepletionAndAmortization
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_AllOtherSegmentsMember		 7,909,000us-gaap_DepreciationDepletionAndAmortization
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_AllOtherSegmentsMember		 9,582,000us-gaap_DepreciationDepletionAndAmortization
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_AllOtherSegmentsMember		    
Impairment of goodwill and other long-lived assets   $ 9,246,000us-gaap_GoodwillImpairmentLoss
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_AllOtherSegmentsMember		      
United States          
Summary of Significant Accounting Policies (Textual) [Abstract]          
Number of animal hospitals where management services are provided 184woof_NumberOfAnimalHospitalsWhereManagementServicesAreProvided
/ us-gaap_StatementGeographicalAxis
= country_US		        
Canada          
Summary of Significant Accounting Policies (Textual) [Abstract]          
Number of animal hospitals where management services are provided 68woof_NumberOfAnimalHospitalsWhereManagementServicesAreProvided
/ us-gaap_StatementGeographicalAxis
= country_CA