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Summary of Significant Accounting Policies - Summary of Investments Held to Maturity (Details) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2014 | Dec. 31, 2013
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Gain (Loss) on Investments [Line Items] |  |
Amortized Cost | $ 15,987us-gaap_HeldToMaturitySecurities | $ 27,021us-gaap_HeldToMaturitySecurities
Gross Unrealized Gain | 0aaon_HeldtomaturitySecuritiesAccumulatedUnrecognizedHoldingGains | 18aaon_HeldtomaturitySecuritiesAccumulatedUnrecognizedHoldingGains
Gross Unrealized (Loss) | (23)aaon_HeldtomaturitySecuritiesAccumulatedUnrecognizedHoldingLoss | 0aaon_HeldtomaturitySecuritiesAccumulatedUnrecognizedHoldingLoss
Fair Value | 15,964us-gaap_HeldToMaturitySecuritiesFairValue | 27,039us-gaap_HeldToMaturitySecuritiesFairValue
Held-to-maturity Securities, Noncurrent | 4,015us-gaap_HeldToMaturitySecuritiesNoncurrent | 10,981us-gaap_HeldToMaturitySecuritiesNoncurrent
Current Assets [Member] |  |
Gain (Loss) on Investments [Line Items] |  |
Gross Unrealized Gain | 0aaon_HeldtomaturitySecuritiesAccumulatedUnrecognizedHoldingGains / us-gaap_GainLossOnInvestmentsByCategoryAxis = aaon_HeldtomaturitySecuritiesCurrentMember | 11aaon_HeldtomaturitySecuritiesAccumulatedUnrecognizedHoldingGains / us-gaap_GainLossOnInvestmentsByCategoryAxis = aaon_HeldtomaturitySecuritiesCurrentMember
Gross Unrealized (Loss) | (7)aaon_HeldtomaturitySecuritiesAccumulatedUnrecognizedHoldingLoss / us-gaap_GainLossOnInvestmentsByCategoryAxis = aaon_HeldtomaturitySecuritiesCurrentMember | 0aaon_HeldtomaturitySecuritiesAccumulatedUnrecognizedHoldingLoss / us-gaap_GainLossOnInvestmentsByCategoryAxis = aaon_HeldtomaturitySecuritiesCurrentMember
Fair Value | 11,965us-gaap_HeldToMaturitySecuritiesFairValue / us-gaap_GainLossOnInvestmentsByCategoryAxis = aaon_HeldtomaturitySecuritiesCurrentMember | 16,051us-gaap_HeldToMaturitySecuritiesFairValue / us-gaap_GainLossOnInvestmentsByCategoryAxis = aaon_HeldtomaturitySecuritiesCurrentMember
Non Current Assets [Member] |  |
Gain (Loss) on Investments [Line Items] |  |
Gross Unrealized Gain | 0aaon_HeldtomaturitySecuritiesAccumulatedUnrecognizedHoldingGains / us-gaap_GainLossOnInvestmentsByCategoryAxis = aaon_HeldtomaturitySecuritiesNoncurrentMember | 7aaon_HeldtomaturitySecuritiesAccumulatedUnrecognizedHoldingGains / us-gaap_GainLossOnInvestmentsByCategoryAxis = aaon_HeldtomaturitySecuritiesNoncurrentMember
Gross Unrealized (Loss) | (16)aaon_HeldtomaturitySecuritiesAccumulatedUnrecognizedHoldingLoss / us-gaap_GainLossOnInvestmentsByCategoryAxis = aaon_HeldtomaturitySecuritiesNoncurrentMember | 0aaon_HeldtomaturitySecuritiesAccumulatedUnrecognizedHoldingLoss / us-gaap_GainLossOnInvestmentsByCategoryAxis = aaon_HeldtomaturitySecuritiesNoncurrentMember
Fair Value | $ 3,999us-gaap_HeldToMaturitySecuritiesFairValue / us-gaap_GainLossOnInvestmentsByCategoryAxis = aaon_HeldtomaturitySecuritiesNoncurrentMember | $ 10,988us-gaap_HeldToMaturitySecuritiesFairValue / us-gaap_GainLossOnInvestmentsByCategoryAxis = aaon_HeldtomaturitySecuritiesNoncurrentMember

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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 50 -Paragraph 5 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27232-111563 Reference 2: 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=28360136&loc=d3e22054-111558 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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