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Income Taxes - Additional Information (Details) | Mar. 31, 2020
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Income Tax Disclosure [Abstract] |
CARES Act, percent of first-year bonus depreciation | 100.00%

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- Definition CARES Act, Percent of First-year Bonus Depreciation + References No definition available. + Details
Name: | aaon_CARESActPercentOfFirstYearBonusDepreciation
Namespace Prefix: | aaon_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

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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