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Income Taxes (Narrative) (Details) | 3 Months Ended
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Mar. 31, 2018
Income Tax Disclosure [Abstract] |
Expected effective income tax rate for the year | 28.00%

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- Definition Expected Effective Income Tax Rate, Continuing Operations + References No definition available. + Details
Name: | aaon_ExpectedEffectiveIncomeTaxRateContinuingOperations
Namespace Prefix: | aaon_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- References No definition available. + Details
Name: | us-gaap_IncomeTaxDisclosureAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration