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Revolving Credit Facility (Details) (USD $)
0 Months Ended
Apr. 03, 2015
item
Dec. 31, 2014
Mar. 31, 2014
Revolving credit facility      
Company's net worth $ 233,938,000us-gaap_StockholdersEquity $ 229,553,000us-gaap_StockholdersEquity  
Effective interest rate (as a percent) 2.67%us-gaap_DebtInstrumentInterestRateEffectivePercentage   2.45%us-gaap_DebtInstrumentInterestRateEffectivePercentage
Revolving Credit Facility.      
Revolving credit facility      
Revolving credit limit 175,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
   
Potential future expansion of the Facility under accordion feature 250,000,000afam_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 79,000,000us-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 73,000,000us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
   
Minimum net worth required to be maintained $ 167,300,000afam_LineOfCreditFacilityCovenantsMinimumNetWorth
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
   
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) 1.75%afam_DebtInstrumentBasisSpreadOnVariableRateActual
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
/ us-gaap_VariableRateAxis
= us-gaap_PrimeRateMember
   
Revolving Credit Facility. | LIBOR      
Revolving credit facility      
Variable rate basis LIBOR    
Revolving Credit Facility. | LIBOR | Minimum      
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_MinimumMember
/ us-gaap_VariableRateAxis
= us-gaap_LondonInterbankOfferedRateLIBORMember