v2.4.0.8

Share-Based Compensation (Summary of Income Tax Benefit Related to Share-Based Compensation) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Options	$ 84	$ 229	$ 376	$ 247
Restricted stock	33	5	126	20
Total	$ 117	$ 234	$ 502	$ 267

X

- Definition

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

+ References

No definition available.

+ Details

Name:	aaon_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpenseRestrictedStock
Namespace Prefix:	aaon_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Tax benefit from share-based compensation related to options.

+ References

No definition available.

+ Details

Name:	aaon_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpenseStockOptions
Namespace Prefix:	aaon_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Details

Name:	us-gaap_DisclosureOfCompensationRelatedCostsSharebasedPaymentsAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

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

+ Details

Name:	us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration