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Income Taxes (Narrative) (Details)	3 Months Ended
	Mar. 31, 2018
Income Tax Disclosure [Abstract]
Expected effective income tax rate for the year	28.00%

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- Definition

Expected Effective Income Tax Rate, Continuing Operations

+ References

No definition available.

+ Details

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Namespace Prefix:	aaon_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

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- References

No definition available.

+ Details

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