Quarterly report pursuant to Section 13 or 15(d)

Commitments and Contingencies- Commitments as a Result of Acquisitions (Details)

v2.4.1.9
Commitments and Contingencies- Commitments as a Result of Acquisitions (Details) (EEX)
In Millions, unless otherwise specified
Mar. 31, 2015
USD ($)
Mar. 31, 2015
GBP (£)
Loss Contingencies [Line Items]    
Business combination, contingent consideration arrangements, range of outcomes, value, high $ 6.7us-gaap_BusinessCombinationContingentConsiderationArrangementsRangeOfOutcomesValueHigh
/ us-gaap_BusinessAcquisitionAxis
= amrc_EEXMember
£ 4.5us-gaap_BusinessCombinationContingentConsiderationArrangementsRangeOfOutcomesValueHigh
/ us-gaap_BusinessAcquisitionAxis
= amrc_EEXMember