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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

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