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Investments (Narrative) (Details) (USD $)	3 Months Ended
	Mar. 31, 2015	Dec. 31, 2014
Schedule of Investments [Line Items]
Certificates of deposits	8,700,000aaon_CertificatesOfDepositAtCarryingValueCurrentAndNoncurrent	$ 11,400,000aaon_CertificatesOfDepositAtCarryingValueCurrentAndNoncurrent
Certificates of deposit interest rate, lower range	0.20%aaon_CertificatesOfDepositInterestRateLowerRange
Certificates of deposit interest rate, upper range	0.60%aaon_CertificatesOfDepositInterestRateUpperRange
Investments held to maturity	6,977,000us-gaap_HeldToMaturitySecurities	$ 15,987,000us-gaap_HeldToMaturitySecurities
Minimum [Member]
Schedule of Investments [Line Items]
Certificates of deposit maturity dates	1 month
Investments maturity dates	1 month
Maximum [Member]
Schedule of Investments [Line Items]
Certificates of deposit maturity dates	16 months
Investments maturity dates	16 months

X

- Definition

Total of current and noncurrent portions of a savings certificate entitling the Entity to receive interest at an established maturity date, based upon a fixed interest rate.

+ References

No definition available.

+ Details

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X

- Definition

Lower range of interest rates for certificates of deposit.

+ References

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+ Details

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X

- Definition

Upper range of interest rates for certificates of deposit.

+ References

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- Definition

Maturity dates of certificates of deposits.

+ References

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- Definition

The perod of time during which held to maturity securities mature.

+ References

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- Definition

Amount after other than temporary impairment (OTTI) accretion, of investments in debt securities classified as held-to-maturity.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 320

-SubTopic 10

-Section 25

-Paragraph 1

-Subparagraph (c)

-URI http://asc.fasb.org/extlink&oid=51813488&loc=d3e22054-111558



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 320

-SubTopic 10

-Section 50

-Paragraph 5

-Subparagraph (f)

-URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27232-111563



Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 320

-SubTopic 10

-Section 50

-Paragraph 5

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27232-111563



Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 944

-SubTopic 210

-Section S99

-Paragraph 1

-Subparagraph (SX 210.7-03.1)

-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910



Reference 5: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 942

-SubTopic 210

-Section S99

-Paragraph 1

-Subparagraph (SX 210.9-03.6)

-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

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