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Share-Based Compensation (Summary of Income Tax Benefit Related to Share-Based Compensation) (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	$ 1,076aaon_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpenseStockOptions	$ 324aaon_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpenseStockOptions
Restricted stock	22aaon_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpenseRestrictedStock	32aaon_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpenseRestrictedStock
Total	$ 1,098us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense	$ 356us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense

X

- Definition

Tax benefit from share-based compensation related to restricted stock.

+ References

No definition available.

+ Details

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X

- Definition

Tax benefit from share-based compensation related to options.

+ References

No definition available.

+ Details

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Namespace Prefix:	aaon_
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- Details

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X

- Definition

The total recognized tax benefit related to compensation cost for equity-based payment arrangements recognized in income during the period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (h)(1)(i)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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