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Share-Based Compensation - Summary of Grant Date Fair Value of Awards (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]      
Options $ 817aaon_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsAwardedInPeriodFairValue $ 841aaon_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsAwardedInPeriodFairValue $ 2,569aaon_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsAwardedInPeriodFairValue
Restricted stock 5,024aaon_ShareBasedCompensationArrangementByShareBasedPaymentAwardRestricedStockAwardedInPeriodFairValue 2,306aaon_ShareBasedCompensationArrangementByShareBasedPaymentAwardRestricedStockAwardedInPeriodFairValue 830aaon_ShareBasedCompensationArrangementByShareBasedPaymentAwardRestricedStockAwardedInPeriodFairValue
Total $ 5,841aaon_ShareBasedCompensationArrangementByShareBasedPaymentAwardTotalAwardedInPeriodFairValue $ 3,147aaon_ShareBasedCompensationArrangementByShareBasedPaymentAwardTotalAwardedInPeriodFairValue $ 3,399aaon_ShareBasedCompensationArrangementByShareBasedPaymentAwardTotalAwardedInPeriodFairValue