Change in Method of Accounting for Inventory Valuation - Schedule of Consolidated Statement of Operations (Details) - USD ($) $ / shares in Units, $ in Thousands		3 Months Ended						6 Months Ended		9 Months Ended		12 Months Ended
		Sep. 30, 2022	Jun. 30, 2022	Mar. 31, 2022	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Jun. 30, 2022	Jun. 30, 2021	Sep. 30, 2022	Sep. 30, 2021	Dec. 31, 2022	Dec. 31, 2021
Change in Accounting Estimate [Line Items]
Costs of products sold (excluding depreciation and amortization)												$ 327,996	$ 278,805	[1]
Total operating costs and expenses												387,411	349,702	[1]
Income (loss) from operations												2,778	(4,782)	[1]
Income (loss) before income taxes												5,556	(995)	[1]
Net income (loss)	[2]											3,980	(3,300)	[1],[3],[4]
Net income attributable to Ampco-Pittsburgh												$ 3,416	$ (3,861)	[1]
Net income per basic share attributable to Ampco-Pittsburgh common shareholders												$ 0.18	$ (0.20)	[1]
Net income (loss) per diluted share attributable to Ampco-Pittsburgh common shareholders												$ 0.18	$ (0.20)	[1]
FIFO [Member]
Change in Accounting Estimate [Line Items]
Costs of products sold (excluding depreciation and amortization)		$ 84,101	$ 85,083	$ 80,516	$ 66,011	$ 73,042	$ 70,020	$ 165,599	$ 143,062	$ 249,700	$ 209,073	$ 327,996	$ 278,805
Total operating costs and expenses		99,444	100,498	94,879	81,567	89,568	86,325	195,377	175,893	294,821	257,460	387,411	349,702
Income (loss) from operations		203	2,084	(453)	(382)	2,860	475	1,631	3,335	1,834	2,953	2,778	(4,782)
Income (loss) before income taxes		2,398	3,315	(31)	804	4,987	263	3,284	5,250	5,682	6,054	5,556	(995)
Net income (loss)		1,411	2,926	(87)	513	3,615	(118)	2,839	3,497	4,250	4,010	3,980	(3,300)
Net income attributable to Ampco-Pittsburgh		$ 1,123	$ 2,807	$ (51)	$ 390	$ 3,454	$ (265)	$ 2,756	$ 3,189	$ 3,879	$ 3,579	$ 3,416	$ (3,861)
Net income per basic share attributable to Ampco-Pittsburgh common shareholders		$ 0.06	$ 0.15	$ (0.00)	$ 0.02	$ 0.18	$ (0.01)	$ 0.14	$ 0.17	$ 0.20	$ 0.19	$ 0.18	$ (0.20)
Net income (loss) per diluted share attributable to Ampco-Pittsburgh common shareholders		$ 0.06	$ 0.14	$ (0.00)	$ 0.02	$ 0.16	$ (0.01)	$ 0.14	$ 0.15	$ 0.20	$ 0.18	$ 0.18	$ (0.20)
Effect of Change [Member]
Change in Accounting Estimate [Line Items]
Costs of products sold (excluding depreciation and amortization)		$ (277)	$ (2,404)	$ 1,696	$ (1,979)	$ (2,391)	$ 432	$ (708)	$ (1,959)	$ (985)	$ (3,938)	$ 2,763	$ (8,834)
Total operating costs and expenses		(277)	(2,404)	1,696	(1,979)	(2,391)	432	(708)	(1,959)	(985)	(3,938)	2,763	(8,834)
Income (loss) from operations		277	2,404	(1,696)	1,979	2,391	(432)	708	1,959	985	3,938	(2,763)	8,834
Income (loss) before income taxes		277	2,404	(1,696)	1,979	2,391	(432)	708	1,959	985	3,938	(2,763)	8,834
Net income (loss)		277	2,404	(1,696)	1,979	2,391	(432)	708	1,959	985	3,938	(2,763)	8,834
Net income attributable to Ampco-Pittsburgh		$ 277	$ 2,404	$ (1,696)	$ 1,979	$ 2,391	$ (432)	$ 708	$ 1,959	$ 985	$ 3,938	$ (2,763)	$ 8,834
Net income per basic share attributable to Ampco-Pittsburgh common shareholders		$ 0.02	$ 0.13	$ (0.09)	$ 0.10	$ 0.12	$ (0.02)	$ 0.03	$ 0.10	$ 0.05	$ 0.21	$ (0.14)	$ 0.47
Net income (loss) per diluted share attributable to Ampco-Pittsburgh common shareholders		$ 0.02	$ 0.12	$ (0.08)	$ 0.10	$ 0.11	$ (0.02)	$ 0.03	$ 0.09	$ 0.05	$ 0.20	$ (0.14)	$ 0.47
LIFO [Member]
Change in Accounting Estimate [Line Items]
Costs of products sold (excluding depreciation and amortization)		$ 84,378	$ 87,487	$ 78,820	$ 67,990	$ 75,433	$ 69,588	$ 166,307	$ 145,021	$ 250,685	$ 213,011	$ 330,759	$ 287,639
Total operating costs and expenses		99,721	102,902	93,183	83,546	91,959	85,893	196,085	177,852	295,806	261,398	390,174	358,536
Income (loss) from operations		(74)	(320)	1,243	(2,361)	469	907	923	1,376	849	(985)	15	(13,616)
Income (loss) before income taxes		2,121	911	1,665	(1,175)	2,596	695	2,576	3,291	4,697	2,116	2,793	(9,829)
Net income (loss)		1,134	522	1,609	(1,466)	1,224	314	2,131	1,538	3,265	72	1,217	(12,134)
Net income attributable to Ampco-Pittsburgh		$ 846	$ 403	$ 1,645	$ (1,589)	$ 1,063	$ 167	$ 2,048	$ 1,230	$ 2,894	$ (359)	$ 653	$ (12,695)
Net income per basic share attributable to Ampco-Pittsburgh common shareholders		$ 0.04	$ 0.02	$ 0.09	$ (0.08)	$ 0.06	$ 0.01	$ 0.11	$ 0.07	$ 0.15	$ (0.02)	$ 0.04	$ (0.67)
Net income (loss) per diluted share attributable to Ampco-Pittsburgh common shareholders		$ 0.04	$ 0.02	$ 0.08	$ (0.08)	$ 0.05	$ 0.01	$ 0.11	$ 0.06	$ 0.15	$ (0.02)	$ 0.04	$ (0.67)

[1] Costs of products sold (excluding depreciation and amortization) and subsequent subtotals and totals along with net loss per share for 2021 were adjusted to include inventory costs using the FIFO basis of costing. See Note 2.

[2] Retained deficit as of January 1, 2021, net loss for 2021 and retained deficit as of December 31, 2021 were adjusted to include inventory costs using the FIFO basis of costing. See Note 2.   See Notes to Consolidated Financial Statements.

[3] Net loss and the change in inventories for 2021 were adjusted to include inventory costs using the FIFO basis of costing. See Note 2.   See Notes to Consolidated Financial Statements.

[4] Net loss for 2021 and subsequent subtotals and totals were adjusted to include inventory costs using the FIFO basis of costing. See Note 2