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Share-Based Compensation - Summary of Income Tax Benefit Related to Share-Based Compensation (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 $ 979aaon_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpenseStockOptions $ 715aaon_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpenseStockOptions $ 370aaon_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpenseStockOptions
Restricted stock 260aaon_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpenseRestrictedStock 128aaon_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpenseRestrictedStock 23aaon_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpenseRestrictedStock
Total $ 1,239us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense $ 843us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense $ 393us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense