Segments - Long-lived Assets (Details) - USD ($) $ in Thousands	Jun. 30, 2026	Dec. 31, 2025
Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Geographical Area, Revenue and Long-Lived Asset [Line Items]
Total long-lived assets	$ 698,969	$ 649,250
Operating Segments \| AAON Oklahoma
Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Geographical Area, Revenue and Long-Lived Asset [Line Items]
Total long-lived assets	444,514	400,316
Operating Segments \| AAON Coil Products
Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Geographical Area, Revenue and Long-Lived Asset [Line Items]
Total long-lived assets	158,116	157,752
Operating Segments \| BasX
Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Geographical Area, Revenue and Long-Lived Asset [Line Items]
Total long-lived assets	$ 96,339	$ 91,182