Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Operating Activities
Net income	$ 44,158us-gaap_NetIncomeLoss	$ 37,547us-gaap_NetIncomeLoss	$ 27,449us-gaap_NetIncomeLoss
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation	11,553us-gaap_Depreciation	12,312us-gaap_Depreciation	13,407us-gaap_Depreciation
Amortization of bond premiums	688us-gaap_AdjustmentForAmortization	790us-gaap_AdjustmentForAmortization	155us-gaap_AdjustmentForAmortization
Allowance for Doubtful Accounts Receivable, Period Increase (Decrease)	(22)	141	(83)
Provision for excess and obsolete inventories	135us-gaap_InventoryWriteDown	243us-gaap_InventoryWriteDown	63us-gaap_InventoryWriteDown
Share-based compensation	2,178us-gaap_ShareBasedCompensation	1,763us-gaap_ShareBasedCompensation	1,294us-gaap_ShareBasedCompensation
Excess tax benefits from stock options exercised and restricted stock awards vested	(1,239)	(843)	(393)
(Gain) loss on disposition of assets	(305)us-gaap_GainLossOnDispositionOfAssets	(22)us-gaap_GainLossOnDispositionOfAssets	4us-gaap_GainLossOnDispositionOfAssets
Foreign currency transaction loss (gain)	74	67	(27)
Interest income on note receivable	(36)aaon_InterestIncomeNoteReceivable	(40)aaon_InterestIncomeNoteReceivable	(42)aaon_InterestIncomeNoteReceivable
Deferred income taxes	(2,111)us-gaap_DeferredIncomeTaxExpenseBenefit	(1,594)us-gaap_DeferredIncomeTaxExpenseBenefit	(2,028)us-gaap_DeferredIncomeTaxExpenseBenefit
Write-off of note receivable	0aaon_WriteoffofNoteReceivable	75aaon_WriteoffofNoteReceivable	0aaon_WriteoffofNoteReceivable
Changes in assets and liabilities:
Accounts receivable	(5,007)	4,662	(9,646)
Income tax receivable	(257)	464	9,715
Inventories	(5,613)us-gaap_IncreaseDecreaseInInventories	231us-gaap_IncreaseDecreaseInInventories	2,271us-gaap_IncreaseDecreaseInInventories
Prepaid expenses and other	(305)	436	(17)
Accounts payable	3,512	(5,197)	2,461
Deferred revenue	782	615	0
Accrued liabilities	4,094	1,942	6,584
Net cash provided by operating activities	52,279	53,592	51,167
Investing Activities
Capital expenditures	(16,127)	(9,041)	(14,147)
Proceeds from sale of property, plant and equipment	319	92	11
Investment in certificates of deposits	(9,940)	(9,108)	(6,540)
Maturities of certificates of deposits	9,310	3,600	1,300
Purchase of investments held to maturity	(6,880)	(22,275)	(11,654)
Maturities of investments	14,197	2,005	0
Proceeds from called investments	3,029	3,332	626
Principal payments from note receivable	63	69	69
Net cash used in investing activities	(6,029)	(31,326)	(30,335)
Financing Activities
Borrowings under revolving credit facility	0us-gaap_ProceedsFromLinesOfCredit	8,325us-gaap_ProceedsFromLinesOfCredit	34,847us-gaap_ProceedsFromLinesOfCredit
Payments under revolving credit facility	0us-gaap_RepaymentsOfLinesOfCredit	(8,325)us-gaap_RepaymentsOfLinesOfCredit	(39,422)us-gaap_RepaymentsOfLinesOfCredit
Stock options exercised	1,318	1,467	1,996
Excess tax benefits from stock options exercised and restricted stock awards vested	1,239	843	393
Repurchase of stock	(29,284)us-gaap_PaymentsForRepurchaseOfEquity	(8,222)us-gaap_PaymentsForRepurchaseOfEquity	(6,660)us-gaap_PaymentsForRepurchaseOfEquity
Cash dividends paid to stockholders	(9,656)us-gaap_PaymentsOfDividends	(7,428)us-gaap_PaymentsOfDividends	(8,840)us-gaap_PaymentsOfDividends
Net cash used in financing activities	(36,383)	(13,340)	(17,686)
Net increase in cash and cash equivalents	9,867	8,926	3,146
Cash and cash equivalents, beginning of year	12,085	3,159	13
Cash and cash equivalents, end of year	$ 21,952	$ 12,085	$ 3,159

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- Definition

Amount of cash outflow through purchase of long-term held-to-maturity securities.

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

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Investing Activities

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-Publisher FASB

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-Topic 320

-SubTopic 10

-Section 45

-Paragraph 11

-URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26853-111562

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- Definition

The cash outflow associated with other investments held by the entity for investment purposes not otherwise defined in the taxonomy.

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- Definition

The cash outflow for purchases of and capital improvements on property, plant and equipment (capital expenditures), software, and other intangible assets.

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- Definition

The cash inflow associated with principal collections from a borrowing supported by a written promise to pay an obligation.

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- Definition

Amount of cash inflow from contractual arrangement with the lender, including but not limited to, letter of credit, standby letter of credit and revolving credit arrangements.

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 235

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.4-08.(f))

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-Article 4

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-SubTopic 10

-Section 45

-Paragraph 14

-Subparagraph (b)

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- Definition

The cash inflow associated with the maturity, prepayments and calls (requests for early payments) of debt securities designated as held-to-maturity.

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-Publisher FASB

-Name Accounting Standards Codification

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-Publisher FASB

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-Topic 230

-SubTopic 10

-Section 45

-Paragraph 12

-Subparagraph (a)

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- Definition

The cash inflow associated with the sale and maturity (principal being due) of other investments, prepayment and call (request of early payment) of other investments not otherwise defined in the taxonomy.

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- Definition

The cash inflow associated with the sale, maturity and collection of all investments such as debt, security and so forth during the period.

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- Definition

The cash inflow from the sale of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale.

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- Definition

The cash inflow associated with the amount received from holders exercising their stock options. This item inherently excludes any excess tax benefit, which the entity may have realized and reported separately.

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-Publisher FASB

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-Glossary Financing Activities

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-Publisher FASB

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-Topic 718

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-Section 50

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-Section 45

-Paragraph 14

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Amount of cash outflow for payment of an obligation from a lender, including but not limited to, letter of credit, standby letter of credit and revolving credit arrangements.

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-Publisher FASB

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-Topic 235

-SubTopic 10

-Section S99

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-Subparagraph (SX 210.4-08.(f))

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-Publisher SEC

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-URI http://asc.fasb.org/extlink&oid=6513228

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- Definition

The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method.

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