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Inventories (Allowance) (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Allowance for excess and obsolete inventories:      
Balance, beginning of period $ 579us-gaap_InventoryValuationReserves $ 363us-gaap_InventoryValuationReserves $ 300us-gaap_InventoryValuationReserves
Provisions for excess and obsolete inventories 135aaon_InventoryValuationReservesProvision 243aaon_InventoryValuationReservesProvision 63aaon_InventoryValuationReservesProvision
Inventories written off 0aaon_InventoryValuationReservesWriteOffs (27)aaon_InventoryValuationReservesWriteOffs 0aaon_InventoryValuationReservesWriteOffs
Balance, end of period $ 714us-gaap_InventoryValuationReserves $ 579us-gaap_InventoryValuationReserves $ 363us-gaap_InventoryValuationReserves