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Inventories (Details) (USD $)
Apr. 03, 2015
Dec. 31, 2014
Inventory Disclosure [Abstract]    
Aluminum and steel coil $ 71,270,000emax_InventoryAluminumAndSteelCoilNetOfReserves $ 72,587,000emax_InventoryAluminumAndSteelCoilNetOfReserves
Raw materials 19,829,000emax_InventoryRawMaterialsExcludingAluminumAndSteelCoilNetOfReserves 16,427,000emax_InventoryRawMaterialsExcludingAluminumAndSteelCoilNetOfReserves
Work in process 2,481,000emax_InventoryWorkInProcessExcludingAluminumAndSteelCoilNetOfReserves 2,467,000emax_InventoryWorkInProcessExcludingAluminumAndSteelCoilNetOfReserves
Finished products 17,068,000emax_InventoryFinishedProductsExcludingAluminumAndSteelCoilNetOfReserves 14,904,000emax_InventoryFinishedProductsExcludingAluminumAndSteelCoilNetOfReserves
Inventories, net 110,648,000us-gaap_InventoryNet 106,385,000us-gaap_InventoryNet
Inventory valuation reserves $ (2,600,000)us-gaap_InventoryValuationReserves $ (2,500,000)us-gaap_InventoryValuationReserves