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REVOLVING CREDIT FACILITY (Details) (USD $)
12 Months Ended 0 Months Ended
Dec. 31, 2014
multiple
Feb. 12, 2015
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Revolving credit facility          
Company's net worth $ 229,553,000us-gaap_StockholdersEquity   $ 214,071,000us-gaap_StockholdersEquity $ 204,315,000us-gaap_StockholdersEquity $ 206,297,000us-gaap_StockholdersEquity
Revolving Credit Facility          
Revolving credit facility          
Revolving credit limit 125,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
       
Potential future expansion of the Facility under accordion feature 175,000,000afam_LineOfCreditFacilityMaximumBorrowingCapacityUnderAccordionFeature
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
       
EBITDA multiplier 3.5afam_LineOfCreditFacilityCovenantsEarningsBeforeInterestIncomeTaxDepreciationAndAmortizationMultiplier
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
       
Borrowing capacity permitted to be used per formula 80,000,000us-gaap_LineOfCreditFacilityCurrentBorrowingCapacity
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
       
Irrevocable letters of credit outstanding 7,500,000us-gaap_LettersOfCreditOutstandingAmount
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
       
Remaining borrowing capacity available for use 72,500,000us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
       
Minimum net worth required to be maintained 163,500,000afam_LineOfCreditFacilityCovenantsMinimumNetWorth
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
       
Revolving Credit Facility | Subsequent event          
Revolving credit facility          
Term of debt instrument   5 years      
Revolving credit limit   175,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
     
Potential future expansion of the Facility under accordion feature   $ 250,000,000afam_LineOfCreditFacilityMaximumBorrowingCapacityUnderAccordionFeature
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
     
Revolving Credit Facility | Maximum          
Revolving credit facility          
Percentage of acquired EBITDA which can be included in covenants calculation 50.00%afam_LineOfCreditFacilityCovenantsPercentageOfAcquiredEarningsBeforeInterestIncomeTaxDepreciationAndAmortizationIncluded
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
       
Revolving Credit Facility | Prime rate          
Revolving credit facility          
Variable rate basis Bank's prime rate plus a margin        
Actual interest rate margin (as a percent) 1.25%afam_DebtInstrumentBasisSpreadOnVariableRateActual
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
/ us-gaap_VariableRateAxis
= us-gaap_PrimeRateMember
       
Weighted average interest rate (as a percent) 2.70%us-gaap_LongtermDebtWeightedAverageInterestRate
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
/ us-gaap_VariableRateAxis
= us-gaap_PrimeRateMember
  5.00%us-gaap_LongtermDebtWeightedAverageInterestRate
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
/ us-gaap_VariableRateAxis
= us-gaap_PrimeRateMember
   
Revolving Credit Facility | Prime rate | Minimum          
Revolving credit facility          
Interest rate margin per debt instrument (as a percent) 1.25%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
/ us-gaap_VariableRateAxis
= us-gaap_PrimeRateMember
       
Revolving Credit Facility | Prime rate | Maximum          
Revolving credit facility          
Interest rate margin per debt instrument (as a percent) 2.25%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
/ us-gaap_VariableRateAxis
= us-gaap_PrimeRateMember
       
Revolving Credit Facility | LIBOR          
Revolving credit facility          
Variable rate basis LIBOR plus a margin        
Actual interest rate margin (as a percent) 2.25%afam_DebtInstrumentBasisSpreadOnVariableRateActual
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
/ us-gaap_VariableRateAxis
= us-gaap_LondonInterbankOfferedRateLIBORMember
       
Revolving Credit Facility | LIBOR | Minimum          
Revolving credit facility          
Interest rate margin per debt instrument (as a percent) 2.25%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
/ us-gaap_VariableRateAxis
= us-gaap_LondonInterbankOfferedRateLIBORMember
       
Revolving Credit Facility | LIBOR | Minimum | Subsequent event          
Revolving credit facility          
Interest rate margin per debt instrument (as a percent)   1.75%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
/ us-gaap_VariableRateAxis
= us-gaap_LondonInterbankOfferedRateLIBORMember
     
Revolving Credit Facility | LIBOR | Maximum          
Revolving credit facility          
Interest rate margin per debt instrument (as a percent) 3.25%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
/ us-gaap_VariableRateAxis
= us-gaap_LondonInterbankOfferedRateLIBORMember
       
Revolving Credit Facility | LIBOR | Maximum | Subsequent event          
Revolving credit facility          
Interest rate margin per debt instrument (as a percent)   3.00%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
/ us-gaap_VariableRateAxis
= us-gaap_LondonInterbankOfferedRateLIBORMember