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Share-Based Compensation (Summary of Grant Date Fair Value of Awards) (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]    
Options $ 657aaon_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsAwardedInPeriodFairValue $ 120aaon_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsAwardedInPeriodFairValue
Restricted stock 1,722aaon_ShareBasedCompensationArrangementByShareBasedPaymentAwardRestricedStockAwardedInPeriodFairValue 270aaon_ShareBasedCompensationArrangementByShareBasedPaymentAwardRestricedStockAwardedInPeriodFairValue
Total $ 2,379aaon_ShareBasedCompensationArrangementByShareBasedPaymentAwardTotalAwardedInPeriodFairValue $ 390aaon_ShareBasedCompensationArrangementByShareBasedPaymentAwardTotalAwardedInPeriodFairValue