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Summary of Significant Accounting Policies - Narrative (Details) (USD $) | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Schedule of Accounting Policies [Line Items] |  |  |
Investments in certificates of deposit | $ 11,400,000aaon_PaymentsToAcquireCertificatesOfDeposits | $ 10,700,000aaon_PaymentsToAcquireCertificatesOfDeposits |
Certificates of deposit interest rate, lower range | 0.20%aaon_CertificatesOfDepositInterestRateLowerRange |  |
Certificates of deposit interest rate, upper range | 0.60%aaon_CertificatesOfDepositInterestRateUpperRange |  |
Investments held to maturity | 15,987,000us-gaap_HeldToMaturitySecurities | 27,021,000us-gaap_HeldToMaturitySecurities |
Research and development costs | 6,300,000us-gaap_ResearchAndDevelopmentExpense | 5,200,000us-gaap_ResearchAndDevelopmentExpense | 3,600,000us-gaap_ResearchAndDevelopmentExpense
Advertising expense | 1,000,000us-gaap_AdvertisingExpense | 900,000us-gaap_AdvertisingExpense | 900,000us-gaap_AdvertisingExpense
Shipping and handling fees | 8,500,000us-gaap_ShippingHandlingAndTransportationCosts | 7,900,000us-gaap_ShippingHandlingAndTransportationCosts | 8,600,000us-gaap_ShippingHandlingAndTransportationCosts
Payments to representatives | $ 59,700,000us-gaap_SalesCommissionsAndFees | $ 63,000,000us-gaap_SalesCommissionsAndFees | $ 57,100,000us-gaap_SalesCommissionsAndFees
Extended product warranties, minimum length | 6 months |  |
Extended product warranties, maximum length | 10 years |  |
Foreign Sales [Member] |  |  |
Schedule of Accounting Policies [Line Items] |  |  |
Concentration risk, percentage | 6.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = aaon_ForeignSalesRevenueNetMember | 5.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = aaon_ForeignSalesRevenueNetMember | 5.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = aaon_ForeignSalesRevenueNetMember
Accounting for More Than 10% of Sales |  |  |
Schedule of Accounting Policies [Line Items] |  |  |
Number of major customers | 0aaon_Numberofmajorcustomers / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_SalesRevenueGoodsNetMember | 0aaon_Numberofmajorcustomers / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_SalesRevenueGoodsNetMember | 0aaon_Numberofmajorcustomers / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_SalesRevenueGoodsNetMember
Accounting for More Than 5% of Accounts Receivable |  |  |
Schedule of Accounting Policies [Line Items] |  |  |
Number of major customers |  | 1aaon_Numberofmajorcustomers / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_AccountsReceivableMember |
Concentration risk, percentage | 5.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_AccountsReceivableMember | 5.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_AccountsReceivableMember |
Minimum |  |  |
Schedule of Accounting Policies [Line Items] |  |  |
Certificates of deposit maturity dates | 1 month |  |
Investments maturity date | 1 month |  |
Maximum |  |  |
Schedule of Accounting Policies [Line Items] |  |  |
Certificates of deposit maturity dates | 19 months |  |
Investments maturity date | 19 months |  |

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