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Inventories (Allowance) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Inventory Valuation Reserves [Roll Forward]
Balance, beginning of period	$ 1,065	$ 773	$ 757	$ 714
Provisions for excess and obsolete inventories	112	(35)	420	24
Inventories written off	0	(135)	0	(135)
Balance, end of period	$ 1,177	$ 603	$ 1,177	$ 603

X

- Definition

Charge to expense for inventory that is expected to be excess or obsolete.

+ References

No definition available.

+ Details

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X

- Definition

Inventory Valuation Reserves [Roll Forward]

+ References

No definition available.

+ Details

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Namespace Prefix:	aaon_
Data Type:	xbrli:stringItemType
Balance Type:	na
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X

- Definition

Inventory that is written off due to being excess or obsolete.

+ References

No definition available.

+ Details

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Namespace Prefix:	aaon_
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X

- Definition

Amount of valuation reserve for inventory.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 330
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SAB TOPIC 5.BB)
-URI http://asc.fasb.org/extlink&oid=27011343&loc=d3e100047-122729

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.6(a))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 4
-Subparagraph (SX 210.12-09)
-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e24092-122690

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 330
-SubTopic 10
-Section 35
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=51655945&loc=d3e3927-108312

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