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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 / us-gaap_ShareRepurchaseProgramAxis = us-gaap_TreasuryStockMember |  | 0us-gaap_TreasuryStockSharesAcquired / us-gaap_ShareRepurchaseProgramAxis = us-gaap_TreasuryStockMember |  |  |  |  |  |  |  |  | 2,600,000us-gaap_TreasuryStockSharesAcquired / us-gaap_ShareRepurchaseProgramAxis = us-gaap_TreasuryStockMember |  |
Aggregate price of shares repurchased since inception |  |  |  |  |  |  |  |  |  |  |  |  |  | 31.5us-gaap_TreasuryStockValueAcquiredCostMethod / us-gaap_ShareRepurchaseProgramAxis = 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 / us-gaap_ShareRepurchaseProgramAxis = us-gaap_TreasuryStockMember |  |
Stock repurchase program amount authorized (in shares) |  |  | 2,900,000us-gaap_StockRepurchaseProgramNumberOfSharesAuthorizedToBeRepurchased / us-gaap_ShareRepurchaseProgramAxis = us-gaap_TreasuryStockMember |  |  |  |  |  |  |  |  |  |  | 2,900,000us-gaap_StockRepurchaseProgramNumberOfSharesAuthorizedToBeRepurchased / us-gaap_ShareRepurchaseProgramAxis = us-gaap_TreasuryStockMember | 2,900,000us-gaap_StockRepurchaseProgramNumberOfSharesAuthorizedToBeRepurchased / us-gaap_ShareRepurchaseProgramAxis = us-gaap_TreasuryStockMember | 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 = aaon_TreasuryStockBMember
[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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