Segments (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2021 USD ($) numberOfEntities	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)
Segment Reporting [Abstract]
Number of Reportable Segments | numberOfEntities	3
Segment Reporting Information [Line Items]
Net sales	$ 534,517	$ 514,551	$ 469,333
Gross profit	137,830	155,849	119,425
Total long-lived assets	275,036	224,911
Total intangible assets and goodwill	155,848	3,267
AAON Oklahoma
Segment Reporting Information [Line Items]
Net sales	463,845	458,957	418,669
AAON Coil Products
Segment Reporting Information [Line Items]
Net sales	66,589	55,594	50,664
BasX
Segment Reporting Information [Line Items]
Net sales	4,083	0	0
Operating Segments | AAON Oklahoma
Segment Reporting Information [Line Items]
Gross profit	126,868	140,099	107,228
Total long-lived assets	183,840	170,603
Total intangible assets and goodwill	3,229	3,267
Operating Segments | AAON Coil Products
Segment Reporting Information [Line Items]
Gross profit	10,075	15,750	12,197
Total long-lived assets	62,534	54,308
Total intangible assets and goodwill	0	0
Operating Segments | BasX
Segment Reporting Information [Line Items]
Net sales	4,083	0	0
Gross profit	887	0	0
Total long-lived assets	28,662	0
Total intangible assets and goodwill	152,619	0
External sales | AAON Oklahoma
Segment Reporting Information [Line Items]
Net sales	463,845	458,957	418,669
External sales | AAON Coil Products
Segment Reporting Information [Line Items]
Net sales	66,589	55,594	50,664
Inter-segment sales | AAON Oklahoma
Segment Reporting Information [Line Items]
Net sales	2,504	2,683	2,261
Inter-segment sales | AAON Coil Products
Segment Reporting Information [Line Items]
Net sales	24,250	21,552	25,792
Eliminations
Segment Reporting Information [Line Items]
Net sales	$ (26,754)	$ (24,235)	$ (28,053)