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Share-Based Compensation (Summary of Grant Date Fair Value of Awards) (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended
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Mar. 31, 2015 | Mar. 31, 2014
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |  |
Options | $ 657 aaon_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsAwardedInPeriodFairValue | $ 120 aaon_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsAwardedInPeriodFairValue
Restricted stock | 1,722 aaon_ShareBasedCompensationArrangementByShareBasedPaymentAwardRestricedStockAwardedInPeriodFairValue | 270 aaon_ShareBasedCompensationArrangementByShareBasedPaymentAwardRestricedStockAwardedInPeriodFairValue
Total | $ 2,379 aaon_ShareBasedCompensationArrangementByShareBasedPaymentAwardTotalAwardedInPeriodFairValue | $ 390 aaon_ShareBasedCompensationArrangementByShareBasedPaymentAwardTotalAwardedInPeriodFairValue

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- Definition Fair value of options awarded during the period. + References No definition available. + Details
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Namespace Prefix: | aaon_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Fair value of restricted stock awarded during period. + References No definition available. + Details
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Namespace Prefix: | aaon_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Total fair value of options and restricted stock awarded during period. + References No definition available. + Details
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Namespace Prefix: | aaon_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration