Employee Benefits	12 Months Ended
Dec. 31, 2014
Compensation and Retirement Disclosure [Abstract]
Employee Benefits	Employee Benefits Defined Contribution Plan - 401(k) - We sponsor a defined contribution plan (“the Plan”). Eligible employees may make contributions in accordance with the Plan and IRS guidelines. In addition to the traditional 401(k), eligible employees are given the option of making an after-tax contribution to a Roth 401(k) or a combination of both. The Plan provides for automatic enrollment and for an automatic increase to the deferral percentage at January 1st of each year and each year thereafter, unless the employee elects to decline the automatic increase and enrollment. Effective October 1, 2013, and each year thereafter, eligible employees are automatically enrolled in the Plan at a 6% deferral rate and currently contributing employees deferral rates will be increased to 6% unless their current rate is above 6% or the employee elects to decline the automatic enrollment or increase. Under the Plan, through September 30, 2013, the Company contributed a specified percentage of each eligible employee’s compensation. In addition, the Company contributed 1.5% of eligible payroll to the Plan each year. Effective October 1, 2013, the Plan was amended such that the Company contributes 3% of eligible payroll to the Plan for each employee and matches 100% up to 6% of employee contributions of eligible compensation. We contribute in the form of cash and direct the investment to shares of AAON stock. Employees are 100% vested in salary deferral contributions and vest 20% per year at the end of years two through six of employment in employer matching contributions. The additional 3% Company contribution vests over two years. For the years ended December 31, 2014, 2013 and 2012 we made contributions of $6.8 million, $3.0 million and $2.4 million, respectively. Administrative expenses were approximately $0.2 million, $0.2 million, and $0.1 million for the years ended 2014, 2013 and 2012, respectively. Profit Sharing Bonus Plan - We maintain a discretionary profit sharing bonus plan under which approximately 10% of pre-tax profit is paid to eligible employees on a quarterly basis in order to reward employee productivity. Eligible employees are regular full-time employees who are actively employed and working on the first and last days of the calendar quarter. Profit sharing expense was $7.8 million, $6.4 million and $4.9 million for the years ended December 31, 2014, 2013 and 2012, respectively.

Employee Benefits

Defined Contribution Plan - 401(k) - We sponsor a defined contribution plan (“the Plan”). Eligible employees may make contributions in accordance with the Plan and IRS guidelines. In addition to the traditional 401(k), eligible employees are given the option of making an after-tax contribution to a Roth 401(k) or a combination of both. The Plan provides for automatic enrollment and for an automatic increase to the deferral percentage at January 1st of each year and each year thereafter, unless the employee elects to decline the automatic increase and enrollment. Effective October 1, 2013, and each year thereafter, eligible employees are automatically enrolled in the Plan at a 6% deferral rate and currently contributing employees deferral rates will be increased to 6% unless their current rate is above 6% or the employee elects to decline the automatic enrollment or increase.

Under the Plan, through September 30, 2013, the Company contributed a specified percentage of each eligible employee’s compensation. In addition, the Company contributed 1.5% of eligible payroll to the Plan each year. Effective October 1, 2013, the Plan was amended such that the Company contributes 3% of eligible payroll to the Plan for each employee and matches 100% up to 6% of employee contributions of eligible compensation. We contribute in the form of cash and direct the investment to shares of AAON stock. Employees are 100% vested in salary deferral contributions and vest 20% per year at the end of years two through six of employment in employer matching contributions. The additional 3% Company contribution vests over two years. For the years ended December 31, 2014, 2013 and 2012 we made contributions of $6.8 million, $3.0 million and $2.4 million, respectively. Administrative expenses were approximately $0.2 million, $0.2 million, and $0.1 million for the years ended 2014, 2013 and 2012, respectively.

Profit Sharing Bonus Plan - We maintain a discretionary profit sharing bonus plan under which approximately 10% of pre-tax profit is paid to eligible employees on a quarterly basis in order to reward employee productivity. Eligible employees are regular full-time employees who are actively employed and working on the first and last days of the calendar quarter. Profit sharing expense was $7.8 million, $6.4 million and $4.9 million for the years ended December 31, 2014, 2013 and 2012, respectively.