Revenues - Schedule of Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Disaggregation of Revenue [Line Items]
Sales	$ 374,473	$ 398,187	$ 1,162,286	$ 1,188,495
Revenue from Contract with Customer \| Product Concentration Risk
Disaggregation of Revenue [Line Items]
Concentration risk percentage	100.00%	100.00%	100.00%	100.00%
Revenue from Contract with Customer \| Geographic Concentration Risk
Disaggregation of Revenue [Line Items]
Concentration risk percentage	100.00%	100.00%	100.00%	100.00%
United States
Disaggregation of Revenue [Line Items]
Sales	$ 323,746	$ 339,895	$ 1,002,864	$ 1,026,342
United States \| Revenue from Contract with Customer \| Geographic Concentration Risk
Disaggregation of Revenue [Line Items]
Concentration risk percentage	86.00%	85.00%	86.00%	86.00%
International
Disaggregation of Revenue [Line Items]
Sales	$ 50,727	$ 58,292	$ 159,422	$ 162,153
International \| Revenue from Contract with Customer \| Geographic Concentration Risk
Disaggregation of Revenue [Line Items]
Concentration risk percentage	14.00%	15.00%	14.00%	14.00%
Nylon
Disaggregation of Revenue [Line Items]
Sales	$ 79,029	$ 93,693	$ 246,900	$ 281,299
Nylon \| Revenue from Contract with Customer \| Product Concentration Risk
Disaggregation of Revenue [Line Items]
Concentration risk percentage	21.00%	24.00%	21.00%	24.00%
Caprolactam
Disaggregation of Revenue [Line Items]
Sales	$ 73,137	$ 76,338	$ 206,993	$ 219,117
Caprolactam \| Revenue from Contract with Customer \| Product Concentration Risk
Disaggregation of Revenue [Line Items]
Concentration risk percentage	20.00%	19.00%	18.00%	18.00%
Plant Nutrients
Disaggregation of Revenue [Line Items]
Sales	$ 138,661	$ 113,552	$ 423,672	$ 355,587
Plant Nutrients \| Revenue from Contract with Customer \| Product Concentration Risk
Disaggregation of Revenue [Line Items]
Concentration risk percentage	37.00%	29.00%	36.00%	30.00%
Chemical Intermediates
Disaggregation of Revenue [Line Items]
Sales	$ 83,646	$ 114,604	$ 284,721	$ 332,492
Chemical Intermediates \| Revenue from Contract with Customer \| Product Concentration Risk
Disaggregation of Revenue [Line Items]
Concentration risk percentage	22.00%	28.00%	25.00%	28.00%

AdvanSix Inc. 10-Q