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Income Taxes - Deferred Tax Assets and Liabilities (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Net current deferred assets and (liabilities) relating to:    
Accounts receivable and inventory reserves $ 355aaon_DeferredTaxAssetValuationReservesCurrent $ 304aaon_DeferredTaxAssetValuationReservesCurrent
Warranty accrual 3,263aaon_DeferredTaxAssetWarrantyAccrualCurrent 2,901aaon_DeferredTaxAssetWarrantyAccrualCurrent
Other accruals 1,238aaon_DeferredTaxAssetOtherAccualsCurrent 1,420aaon_DeferredTaxAssetOtherAccualsCurrent
Donations 642aaon_DonationsCurrent 0aaon_DonationsCurrent
Other, net 645aaon_DeferredTaxAssetOtherNetCurrent 154aaon_DeferredTaxAssetOtherNetCurrent
Total 6,143us-gaap_DeferredTaxAssetsLiabilitiesNetCurrent 4,779us-gaap_DeferredTaxAssetsLiabilitiesNetCurrent
Net long-term deferred assets and (liabilities) relating to:    
Depreciation (15,294)aaon_DeferredTaxLiabilitiesDepreciationNoncurrent (14,843)aaon_DeferredTaxLiabilitiesDepreciationNoncurrent
Share-based compensation 707aaon_DeferredTaxAssetShareBasedCompensationNoncurrent 692aaon_DeferredTaxAssetShareBasedCompensationNoncurrent
Donations 667aaon_DeferredTaxAssetsDonationsNoncurrent 0aaon_DeferredTaxAssetsDonationsNoncurrent
Other, net 243aaon_DeferredTaxAssetOtherNetNoncurrent (273)aaon_DeferredTaxAssetOtherNetNoncurrent
Total $ (13,677)us-gaap_DeferredTaxAssetsLiabilitiesNetNoncurrent $ (14,424)us-gaap_DeferredTaxAssetsLiabilitiesNetNoncurrent