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Note Receivable (Details) $ in Thousands, $ in Millions |  | 12 Months Ended |
--- | --- | --- | ---
Sep. 30, 2010 CAD ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($)
Note Receivable [Abstract] |  |  |
Note receivable | $ 1.1 | $ 598 | $ 678
Term | 15 years |  |
Interest rate | 4.00% |  |
Balloon payment on note receivable | $ 0.6 |  |
Balloon payment due date |  | October 2025 |

X
- Definition Amount of balloon payment associated with note receivable. + References No definition available. + Details
Name: | aaon_Balloonpaymentonnotereceivable
Namespace Prefix: | aaon_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition -- None. No documentation exists for this element. -- + References No definition available. + Details
Name: | aaon_NoteReceivableAbstract
Namespace Prefix: | aaon_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Due date of balloon payment for note receivable. + References No definition available. + Details
Name: | aaon_NoteReceivablePaymentTermsBalloonPaymentDueDate
Namespace Prefix: | aaon_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Notes, Loans and Financing Receivable, interest rate earned on note receivables. + References No definition available. + Details
Name: | aaon_NotesLoansandFinancingReceivableInterestRate
Namespace Prefix: | aaon_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

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- Definition Notes, Loans and Financing Receivable, Term + References No definition available. + Details
Name: | aaon_NotesLoansandFinancingReceivableTerm
Namespace Prefix: | aaon_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Definition An amount representing an agreement for an unconditional promise by the maker to pay the Entity (holder) a definite sum of money at a future date more than one year from the balance sheet date, net of any write-downs taken for collection uncertainty on the part of the holder. Such amount may include accrued interest receivable in accordance with the terms of the debt. The debt also may contain provisions and related items including a discount or premium, payable on demand, secured, or unsecured, interest bearing or noninterest bearing, among a myriad of other features and characteristics. This amount does not include amounts related to receivables held-for-sale. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.17) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
Name: | us-gaap_NotesAndLoansReceivableNetNoncurrent
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant