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Shareholders' Equity (Details Narrative) (USD $)
In Millions, except Share data, unless otherwise specified

0 Months Ended

12 Months Ended

0 Months Ended

55 Months Ended

114 Months Ended

98 Months Ended

Jul. 16, 2014

Jul. 02, 2013

Dec. 31, 2014

Dec. 31, 2013

Dec. 31, 2012

Nov. 07, 2012

Nov. 04, 2014

May 02, 2014

Nov. 06, 2013

May 21, 2013

Dec. 31, 2014

Dec. 31, 2014

Dec. 31, 2014

Schedule of Shareholders' Equity [Line Items]

Dividends declared (per share)

$ 0.18us-gaap_CommonStockDividendsPerShareDeclared

^[1]

$ 0.13us-gaap_CommonStockDividendsPerShareDeclared

^[1],[2]

$ 0.16us-gaap_CommonStockDividendsPerShareDeclared

^[1]

Stock split, conversion ratio

1.5us-gaap_StockholdersEquityNoteStockSplitConversionRatio1

1.5us-gaap_StockholdersEquityNoteStockSplitConversionRatio1

Cash dividends paid

$ 9.7us-gaap_PaymentsOfDividendsCommonStock

$ 7.4us-gaap_PaymentsOfDividendsCommonStock

$ 8.8us-gaap_PaymentsOfDividendsCommonStock

Special Dividend

Schedule of Shareholders' Equity [Line Items]

Dividends declared (per share)

$ 0.05us-gaap_CommonStockDividendsPerShareDeclared
/ us-gaap_DividendsAxis
= aaon_DividendDeclaredDMember

Regular Semi-Annual Dividend

Schedule of Shareholders' Equity [Line Items]

Dividends declared (per share)

$ 0.05us-gaap_CommonStockDividendsPerShareDeclared
/ us-gaap_DividendsAxis
= us-gaap_DividendDeclaredMember

$ 0.09us-gaap_CommonStockDividendsPerShareDeclared
/ us-gaap_DividendsAxis
= us-gaap_DividendDeclaredMember

$ 0.09us-gaap_CommonStockDividendsPerShareDeclared
/ us-gaap_DividendsAxis
= us-gaap_DividendDeclaredMember

$ 0.07us-gaap_CommonStockDividendsPerShareDeclared
/ us-gaap_DividendsAxis
= us-gaap_DividendDeclaredMember

$ 0.06us-gaap_CommonStockDividendsPerShareDeclared
/ us-gaap_DividendsAxis
= us-gaap_DividendDeclaredMember

2010 Stock Repurchase Program

Schedule of Shareholders' Equity [Line Items]

Stock repurchased during period (in shares)

1,000,000us-gaap_TreasuryStockSharesAcquired
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= us-gaap_TreasuryStockMember

0us-gaap_TreasuryStockSharesAcquired
/ us-gaap_ShareRepurchaseProgramAxis
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2,600,000us-gaap_TreasuryStockSharesAcquired
/ us-gaap_ShareRepurchaseProgramAxis
= us-gaap_TreasuryStockMember

Aggregate price of shares repurchased since inception

31.5us-gaap_TreasuryStockValueAcquiredCostMethod
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= us-gaap_TreasuryStockMember

Average price of shares repurchased since inception (per share)

$ 11.97us-gaap_TreasuryStockAcquiredAverageCostPerShare
/ us-gaap_ShareRepurchaseProgramAxis
= us-gaap_TreasuryStockMember

Stock repurchase program authorized percentage

5.00%aaon_StockRepurchaseProgramAuthorizedPercent
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Stock repurchase program amount authorized (in shares)

2,900,000us-gaap_StockRepurchaseProgramNumberOfSharesAuthorizedToBeRepurchased
/ us-gaap_ShareRepurchaseProgramAxis
= us-gaap_TreasuryStockMember

2,900,000us-gaap_StockRepurchaseProgramNumberOfSharesAuthorizedToBeRepurchased
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= us-gaap_TreasuryStockMember

2,900,000us-gaap_StockRepurchaseProgramNumberOfSharesAuthorizedToBeRepurchased
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2,900,000us-gaap_StockRepurchaseProgramNumberOfSharesAuthorizedToBeRepurchased
/ us-gaap_ShareRepurchaseProgramAxis
= us-gaap_TreasuryStockMember

2005 401(k) Stock Repurchase Program

Schedule of Shareholders' Equity [Line Items]

Stock repurchased during period (in shares)

5,000,000us-gaap_TreasuryStockSharesAcquired
/ us-gaap_ShareRepurchaseProgramAxis
= aaon_TreasuryStockAMember

Aggregate price of shares repurchased since inception

39.3us-gaap_TreasuryStockValueAcquiredCostMethod
/ us-gaap_ShareRepurchaseProgramAxis
= aaon_TreasuryStockAMember

Average price of shares repurchased since inception (per share)

$ 7.81us-gaap_TreasuryStockAcquiredAverageCostPerShare
/ us-gaap_ShareRepurchaseProgramAxis
= aaon_TreasuryStockAMember

2006 Director and Officer Repurchase Program

Schedule of Shareholders' Equity [Line Items]

Stock repurchased during period (in shares)

1,800,000us-gaap_TreasuryStockSharesAcquired
/ us-gaap_ShareRepurchaseProgramAxis
= aaon_TreasuryStockBMember

Aggregate price of shares repurchased since inception

$ 14.0us-gaap_TreasuryStockValueAcquiredCostMethod
/ us-gaap_ShareRepurchaseProgramAxis
= aaon_TreasuryStockBMember

Average price of shares repurchased since inception (per share)

$ 7.76us-gaap_TreasuryStockAcquiredAverageCostPerShare
/ us-gaap_ShareRepurchaseProgramAxis
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[1]	Reflects three-for-two stock split effective July 16, 2014
[2]	Includes special dividend of $0.05 per common share paid on December 24, 2012.

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Aggregate dividends declared during the period for each share of common stock outstanding.

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Amount of cash outflow in the form of ordinary dividends to common shareholders of the parent entity.

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Ratio applied to the conversion of stock split, for example but not limited to, one share converted to two or two shares converted to one.

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