Quarterly report pursuant to Section 13 or 15(d)

Long Term Debt- Term Loan (Details)

v2.4.1.9
Long Term Debt- Term Loan (Details) (Term Loan, Variable Rate Construction Term Loan, USD $)
In Thousands, unless otherwise specified
Mar. 31, 2015
Oct. 31, 2012
Term Loan | Variable Rate Construction Term Loan
   
Debt Instrument [Line Items]    
Original principal amount   $ 47,234us-gaap_DebtInstrumentFaceAmount
/ us-gaap_DebtInstrumentAxis
= amrc_VariableRateConstructionTermLoanMember
/ us-gaap_LongtermDebtTypeAxis
= amrc_TermLoanMember
Debt outstanding $ 40,530us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_DebtInstrumentAxis
= amrc_VariableRateConstructionTermLoanMember
/ us-gaap_LongtermDebtTypeAxis
= amrc_TermLoanMember
 
Weighted average interest rate (percent) 3.255%us-gaap_DebtWeightedAverageInterestRate
/ us-gaap_DebtInstrumentAxis
= amrc_VariableRateConstructionTermLoanMember
/ us-gaap_LongtermDebtTypeAxis
= amrc_TermLoanMember