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Investments (Investments Held to Maturity) (Details) (USD $) In Thousands, unless otherwise specified | Mar. 31, 2015 | Dec. 31, 2014
--- | --- | ---
Gain (Loss) on Investments [Line Items] |  |
Amortized Cost | $ 6,977 us-gaap_HeldToMaturitySecurities | $ 15,987 us-gaap_HeldToMaturitySecurities
Gross Unrealized Gain | 9 aaon_HeldtomaturitySecuritiesAccumulatedUnrecognizedHoldingGains | 0 aaon_HeldtomaturitySecuritiesAccumulatedUnrecognizedHoldingGains
Gross Unrealized (Loss) | (10)us-gaap_HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingLoss | (23)us-gaap_HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingLoss
Fair Value | 6,976 us-gaap_HeldToMaturitySecuritiesFairValue | 15,964 us-gaap_HeldToMaturitySecuritiesFairValue
Current Assets [Member] |  |
Gain (Loss) on Investments [Line Items] |  |
Amortized Cost | 4,984 us-gaap_HeldToMaturitySecurities / us-gaap_GainLossOnInvestmentsByCategoryAxis = aaon_HeldtomaturitySecuritiesCurrentMember | 11,972 us-gaap_HeldToMaturitySecurities / us-gaap_GainLossOnInvestmentsByCategoryAxis = aaon_HeldtomaturitySecuritiesCurrentMember
Gross Unrealized Gain | 9 aaon_HeldtomaturitySecuritiesAccumulatedUnrecognizedHoldingGains / us-gaap_GainLossOnInvestmentsByCategoryAxis = aaon_HeldtomaturitySecuritiesCurrentMember | 0 aaon_HeldtomaturitySecuritiesAccumulatedUnrecognizedHoldingGains / us-gaap_GainLossOnInvestmentsByCategoryAxis = aaon_HeldtomaturitySecuritiesCurrentMember
Gross Unrealized (Loss) | 0 us-gaap_HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingLoss / us-gaap_GainLossOnInvestmentsByCategoryAxis = aaon_HeldtomaturitySecuritiesCurrentMember | (7)us-gaap_HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingLoss / us-gaap_GainLossOnInvestmentsByCategoryAxis = aaon_HeldtomaturitySecuritiesCurrentMember
Fair Value | 4,993 us-gaap_HeldToMaturitySecuritiesFairValue / us-gaap_GainLossOnInvestmentsByCategoryAxis = aaon_HeldtomaturitySecuritiesCurrentMember | 11,965 us-gaap_HeldToMaturitySecuritiesFairValue / us-gaap_GainLossOnInvestmentsByCategoryAxis = aaon_HeldtomaturitySecuritiesCurrentMember
Non Current Assets [Member] |  |
Gain (Loss) on Investments [Line Items] |  |
Amortized Cost | 1,993 us-gaap_HeldToMaturitySecurities / us-gaap_GainLossOnInvestmentsByCategoryAxis = aaon_HeldtomaturitySecuritiesNoncurrentMember | 4,015 us-gaap_HeldToMaturitySecurities / us-gaap_GainLossOnInvestmentsByCategoryAxis = aaon_HeldtomaturitySecuritiesNoncurrentMember
Gross Unrealized Gain | 0 aaon_HeldtomaturitySecuritiesAccumulatedUnrecognizedHoldingGains / us-gaap_GainLossOnInvestmentsByCategoryAxis = aaon_HeldtomaturitySecuritiesNoncurrentMember | 0 aaon_HeldtomaturitySecuritiesAccumulatedUnrecognizedHoldingGains / us-gaap_GainLossOnInvestmentsByCategoryAxis = aaon_HeldtomaturitySecuritiesNoncurrentMember
Gross Unrealized (Loss) | (10)us-gaap_HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingLoss / us-gaap_GainLossOnInvestmentsByCategoryAxis = aaon_HeldtomaturitySecuritiesNoncurrentMember | (16)us-gaap_HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingLoss / us-gaap_GainLossOnInvestmentsByCategoryAxis = aaon_HeldtomaturitySecuritiesNoncurrentMember
Fair Value | $ 1,983 us-gaap_HeldToMaturitySecuritiesFairValue / us-gaap_GainLossOnInvestmentsByCategoryAxis = aaon_HeldtomaturitySecuritiesNoncurrentMember | $ 3,999 us-gaap_HeldToMaturitySecuritiesFairValue / us-gaap_GainLossOnInvestmentsByCategoryAxis = aaon_HeldtomaturitySecuritiesNoncurrentMember

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- Definition Amount of accumulated unrealized gain on investments in debt securities classified as held-to-maturity. + References No definition available. + Details
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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 + Details
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