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Share-Based Compensation (Summary of Income Tax Benefit Related to Share-Based Compensation) (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 | $ 1,076 aaon_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpenseStockOptions | $ 324 aaon_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpenseStockOptions
Restricted stock | 22 aaon_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpenseRestrictedStock | 32 aaon_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpenseRestrictedStock
Total | $ 1,098 us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense | $ 356 us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense

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- Definition Tax benefit from share-based compensation related to restricted stock. + References No definition available. + Details
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Namespace Prefix: | aaon_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Tax benefit from share-based compensation related to options. + References No definition available. + Details
Name: | aaon_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpenseStockOptions
Namespace Prefix: | aaon_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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

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- Definition The total recognized tax benefit related to compensation cost for equity-based payment arrangements recognized in income during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
Name: | us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration