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v2.4.1.9

Investments (Narrative) (Details) (USD $) | 3 Months Ended |
--- | --- | ---
Mar. 31, 2015 | Dec. 31, 2014
Schedule of Investments [Line Items] |  |
Certificates of deposits | 8,700,000 aaon_CertificatesOfDepositAtCarryingValueCurrentAndNoncurrent | $ 11,400,000 aaon_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 | 6,977,000 us-gaap_HeldToMaturitySecurities | $ 15,987,000 us-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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