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Commitments and contingencies (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Operating leases rental expenses    
Rent expense $ 1,867us-gaap_LeaseAndRentalExpense $ 809us-gaap_LeaseAndRentalExpense
Less: income from subleases (11)us-gaap_OperatingLeasesRentExpenseSubleaseRentals1  
Net rent expense 1,856us-gaap_OperatingLeasesRentExpenseNet 809us-gaap_OperatingLeasesRentExpenseNet
Future lease obligations under our operating leases    
2015 1,818us-gaap_OperatingLeasesFutureMinimumPaymentsDueCurrent  
2016 1,632us-gaap_OperatingLeasesFutureMinimumPaymentsDueInTwoYears  
2017 892us-gaap_OperatingLeasesFutureMinimumPaymentsDueInThreeYears  
2018 183us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFourYears  
2019 4us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFiveYears  
Total lease commitments 4,529us-gaap_OperatingLeasesFutureMinimumPaymentsDue  
Less: income from subleases (428)us-gaap_OperatingLeasesFutureMinimumPaymentsDueFutureMinimumSubleaseRentals  
Net lease commitments $ 4,101amh_OperatingLeasesNetFutureMinimumPaymentsDue