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13. Segment Information (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Revenues      
North America $ 195,416AMTX_NorthAmerica $ 144,698AMTX_NorthAmerica $ 175,501AMTX_NorthAmerica
India 12,267AMTX_India 32,816AMTX_India 13,547AMTX_India
Total revenues 207,683AMTX_TotalRevenues 177,514AMTX_TotalRevenues 189,048AMTX_TotalRevenues
Cost of goods sold      
North America 158,719AMTX_NorthAmerica1 130,498AMTX_NorthAmerica1 183,784AMTX_NorthAmerica1
India 11,820AMTX_India1 28,722AMTX_India1 14,191AMTX_India1
Total cost of goods sold 170,539AMTX_TotalCostOfGoodsSold 159,220AMTX_TotalCostOfGoodsSold 197,975AMTX_TotalCostOfGoodsSold
Gross profit (loss)      
North America 36,697AMTX_NorthAmerica2 14,200AMTX_NorthAmerica2 (8,283)AMTX_NorthAmerica2
India 447AMTX_India2 4,094AMTX_India2 (644)AMTX_India2
Total gross profit (loss) $ 37,144AMTX_TotalGrossLoss $ 18,294AMTX_TotalGrossLoss $ (8,927)AMTX_TotalGrossLoss