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Segments - Long-lived Assets (Details) - USD ($)
$ in Thousands
Sep. 30, 2025
Dec. 31, 2024
Revenues from External Customers and Long-Lived Assets [Line Items]    
Total long-lived assets $ 608,702 $ 525,792
Operating Segments | AAON Oklahoma    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Total long-lived assets 364,537 321,597
Operating Segments | AAON Coil Products    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Total long-lived assets 154,681 122,515
Operating Segments | BasX    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Total long-lived assets $ 89,484 $ 81,680