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Employee Benefits - Narrative (Details) (USD $) In Millions, unless otherwise specified | 0 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2013 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Definedcontributionemployeeautomaticcontributionpercentag |  | 6.00%aaon_Definedcontributionemployeeautomaticcontributionpercentag |  |
Company 401K plan contribution (percentage) | 1.50%us-gaap_DefinedContributionPlanEmployerMatchingContributionPercent | 3.00%us-gaap_DefinedContributionPlanEmployerMatchingContributionPercent |  |
Employee salary deferral contributions percentage vested |  | 100.00%aaon_DefinedContributionPlanEmployeesContributionVestedPercentage |  |
Employer contribution annual vesting percentage |  | 20.00%us-gaap_DefinedContributionPlanEmployersMatchingContributionAnnualVestingPercentage |  |
Employer matching contribution, percent of match |  | 100.00%us-gaap_DefinedContributionPlanEmployerMatchingContributionPercentOfMatch |  |
Maximum annual contributions per employee, percent |  | 6.00%aaon_Definedcontributionemployermaximummatchpercent |  |
Employer contribution vesting period |  | years two through six of employment |  |
Employer matching contributions |  | $ 6.8us-gaap_DefinedContributionPlanCostRecognized | $ 3.0us-gaap_DefinedContributionPlanCostRecognized | $ 2.4us-gaap_DefinedContributionPlanCostRecognized
Administrative expenses |  | 0.2us-gaap_DefinedContributionPlanAdministrativeExpenses | 0.2us-gaap_DefinedContributionPlanAdministrativeExpenses | 0.1us-gaap_DefinedContributionPlanAdministrativeExpenses
Profits sharing, percent of pre-tax profit paid to eligible employees on quarterly basis |  | 10.00%aaon_ProfitSharingPercentofPretaxProfitPaidtoEligibleEmployeesonQuarterlyBasis |  |
Profit sharing expense |  | $ 7.8aaon_ProfitSharingBonusPlanExpense | $ 6.4aaon_ProfitSharingBonusPlanExpense | $ 4.9aaon_ProfitSharingBonusPlanExpense
Over Two Years |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Company 401K plan contribution (percentage) |  | 3.00%us-gaap_DefinedContributionPlanEmployerMatchingContributionPercent / us-gaap_VestingAxis = aaon_OverTwoYearsMember |  |

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- Definition Employee automatic contribution percentage + References No definition available. + Details
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Balance Type: | na
Period Type: | duration

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- Definition definedcontributionemployermaximummatchpercent + References No definition available. + Details
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Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition Percentage employees are vested in annual salary deferral contibutions. + References No definition available. + Details
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Namespace Prefix: | aaon_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition Period during which employees are vested in defined contribution plan. + References No definition available. + Details
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Namespace Prefix: | aaon_
Data Type: | xbrli:stringItemType
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- Definition Profit sharing expense during the period. + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Profit Sharing, Percent of Pre-tax Profit Paid to Eligible Employees on Quarterly Basis + References No definition available. + Details
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- Details
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- Definition Amount of administrative expenses incurred by a defined contribution plan. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition The amount of the cost recognized during the period for defined contribution plans. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 70 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6414718&loc=d3e28014-114942 + Details
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- Definition Percentage of employees' gross pay for which the employer contributes a matching contribution to a defined contribution plan. + References No definition available. + Details
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- Definition Percentage employer matches of the employee's percentage contribution matched. + References No definition available. + Details
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- Definition Percentage of employer's matching contributions to a defined contribution plan that vests in a given year. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
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- Details
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Period Type: |