Employee automatic contribution percentage

No definition available.

Name:	aaon_Definedcontributionemployeeautomaticcontributionpercentag
Namespace Prefix:	aaon_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

definedcontributionemployermaximummatchpercent

+ References

No definition available.

+ Details

Name:	aaon_Definedcontributionemployermaximummatchpercent
Namespace Prefix:	aaon_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Percentage employees are vested in annual salary deferral contibutions.

+ References

No definition available.

+ Details

Name:	aaon_DefinedContributionPlanEmployeesContributionVestedPercentage
Namespace Prefix:	aaon_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Period during which employees are vested in defined contribution plan.

+ References

No definition available.

+ Details

Name:	aaon_DefinedContributionPlanEmployersMatchingContributionVestingPeriod
Namespace Prefix:	aaon_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Profit sharing expense during the period.

+ References

No definition available.

+ Details

Name:	aaon_ProfitSharingBonusPlanExpense
Namespace Prefix:	aaon_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Profit Sharing, Percent of Pre-tax Profit Paid to Eligible Employees on Quarterly Basis

+ References

No definition available.

+ Details

Name:	aaon_ProfitSharingPercentofPretaxProfitPaidtoEligibleEmployeesonQuarterlyBasis
Namespace Prefix:	aaon_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Details

Name:	us-gaap_DefinedBenefitPlanDisclosureLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount of administrative expenses incurred by a defined contribution plan.

+ References

No definition available.

+ Details

Name:	us-gaap_DefinedContributionPlanAdministrativeExpenses
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

The amount of the cost recognized during the period for defined contribution plans.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 715

-SubTopic 70

-Section 50

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=6414718&loc=d3e28014-114942

+ Details

Name:	us-gaap_DefinedContributionPlanCostRecognized
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Percentage of employees' gross pay for which the employer contributes a matching contribution to a defined contribution plan.

+ References

No definition available.

+ Details

Name:	us-gaap_DefinedContributionPlanEmployerMatchingContributionPercent
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Percentage employer matches of the employee's percentage contribution matched.

+ References

No definition available.

+ Details

Name:	us-gaap_DefinedContributionPlanEmployerMatchingContributionPercentOfMatch
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Percentage of employer's matching contributions to a defined contribution plan that vests in a given year.

+ References

No definition available.

+ Details

Name:	us-gaap_DefinedContributionPlanEmployersMatchingContributionAnnualVestingPercentage
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Details

Name:	us-gaap_VestingAxis=aaon_OverTwoYearsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Employee Benefits - Narrative (Details) (USD $) In Millions, unless otherwise specified	0 Months Ended	12 Months Ended
	Sep. 30, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Defined Benefit Plan Disclosure [Line Items]
Definedcontributionemployeeautomaticcontributionpercentag		6.00%
Company 401K plan contribution (percentage)	1.50%	3.00%
Employee salary deferral contributions percentage vested		100.00%
Employer contribution annual vesting percentage		20.00%
Employer matching contribution, percent of match		100.00%
Maximum annual contributions per employee, percent		6.00%
Employer contribution vesting period		years two through six of employment
Employer matching contributions		$ 6.8	$ 3.0	$ 2.4
Administrative expenses		0.2	0.2	0.1
Profits sharing, percent of pre-tax profit paid to eligible employees on quarterly basis		10.00%
Profit sharing expense		$ 7.8aaon_ProfitSharingBonusPlanExpense	$ 6.4aaon_ProfitSharingBonusPlanExpense	$ 4.9aaon_ProfitSharingBonusPlanExpense
Over Two Years
Defined Benefit Plan Disclosure [Line Items]
Company 401K plan contribution (percentage)		3.00%