[Line Items] for Schedule of Shareholders' Equity [Table]

No definition available.

Name:	aaon_ScheduleOfShareholdersEquityLineItems
Namespace Prefix:	aaon_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Aggregate dividends declared during the period for each share of common stock outstanding.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.3-04)
-URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770

+ Details

Name:	us-gaap_CommonStockDividendsPerShareDeclared
Namespace Prefix:	us-gaap_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount of stock repurchase plan authorized.

+ References

No definition available.

+ Details

Name:	us-gaap_StockRepurchaseProgramAuthorizedAmount1
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

The number of shares authorized to be repurchased by an entity's Board of Directors under a stock repurchase plan.

+ References

No definition available.

+ Details

Name:	us-gaap_StockRepurchaseProgramNumberOfSharesAuthorizedToBeRepurchased
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

- Definition

Total cost of shares repurchased divided by the total number of shares repurchased.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 30
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6405813&loc=d3e23239-112655

+ Details

Name:	us-gaap_TreasuryStockAcquiredAverageCostPerShare
Namespace Prefix:	us-gaap_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	duration

- Definition

Number of shares that have been repurchased during the period and are being held in treasury.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 02
-Paragraph 29, 30
-Article 5

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 04
-Article 3

+ Details

Name:	us-gaap_TreasuryStockSharesAcquired
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

- Definition

Equity impact of the cost of common and preferred stock that were repurchased during the period. Recorded using the cost method.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 30
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6405813&loc=d3e23239-112655

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.3-04)
-URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770

+ Details

Name:	us-gaap_TreasuryStockValueAcquiredCostMethod
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Details

Name:	us-gaap_DividendsAxis=us-gaap_DividendDeclaredMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_SubsequentEventTypeAxis=us-gaap_SubsequentEventMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_ShareRepurchaseProgramAxis=aaon_A2010StockRepurchaseProgramMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_ShareRepurchaseProgramAxis=aaon_A2005401kStockRepurchaseProgramMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_ShareRepurchaseProgramAxis=aaon_A2006DirectorandOfficerRepurchaseProgramMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Stockholders' Equity (Details) - USD ($)				1 Months Ended	3 Months Ended		9 Months Ended		76 Months Ended	119 Months Ended	135 Months Ended
Stockholders' Equity (Details) - USD ($)	May 24, 2016	Oct. 29, 2015	May 19, 2015	Oct. 31, 2016	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2016	Sep. 30, 2016	Jun. 02, 2016
Schedule of Shareholders' Equity [Line Items]
Stock repurchased during period (in shares)							575,256	418,912			11,629,980
Aggregate price of shares repurchased since inception							$ 15,131,237	$ 9,437,458			$ 137,336,072
Average price of shares repurchased since inception (per share)							$ 26.30	$ 22.53			$ 11.81
Cash dividends declared per common share					$ 0	$ 0	$ 0.11	$ 0.11
Dividend Declared [Member]
Schedule of Shareholders' Equity [Line Items]
Cash dividends declared per common share	$ 0.11	$ 0.11	$ 0.11
Subsequent Event [Member]
Schedule of Shareholders' Equity [Line Items]
Stock repurchased during period (in shares)				34,455
Aggregate price of shares repurchased since inception				$ 1,000,000
2010 Stock Repurchase Program [Member]
Schedule of Shareholders' Equity [Line Items]
Stock repurchase program amount authorized (in shares)			5,700,000.0									2,000,000.0
Stock Repurchase Program, Authorized Amount	$ 25,000,000											$ 25,000,000
Stock repurchased during period (in shares)							151,266	0	3,820,487
Aggregate price of shares repurchased since inception							$ 4,041,685	$ 0	$ 60,549,487
Average price of shares repurchased since inception (per share)							$ 26.72	$ 0.00	$ 15.85
2005 401(k) Stock Repurchase Program [Member]
Schedule of Shareholders' Equity [Line Items]
Stock repurchased during period (in shares)							402,623	403,172			5,944,566
Aggregate price of shares repurchased since inception							$ 10,531,020	$ 9,075,481			$ 61,387,891
Average price of shares repurchased since inception (per share)							$ 26.16	$ 22.51			$ 10.33
2006 Director and Officer Repurchase Program [Member]
Schedule of Shareholders' Equity [Line Items]
Stock repurchased during period (in shares)							21,367	15,740		1,864,927
Aggregate price of shares repurchased since inception							$ 558,532	$ 361,977		$ 15,398,694
Average price of shares repurchased since inception (per share)							$ 26.14	$ 23.00		$ 8.26