Ampco-Pittsburgh (AP) 10-Q 12 Nov 24 2024 Q3 Quarterly report Financial data

Document and Entity Information

Document and Entity Information - shares	9 Months Ended
	Sep. 30, 2024	Nov. 07, 2024
Document Information [Line Items]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Sep. 30, 2024
Document Fiscal Year Focus	2024
Document Fiscal Period Focus	Q3
Entity Registrant Name	AMPCO-PITTSBURGH CORP
Entity Central Index Key	0000006176
Current Fiscal Year End Date	--12-31
Entity Current Reporting Status	Yes
Entity Filer Category	Non-accelerated Filer
Entity Small Business	true
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Common Stock, Shares Outstanding		20,094,289
Entity File Number	1-898
Entity Tax Identification Number	25-1117717
Entity Address, Address Line One	726 Bell Avenue
Entity Address, Address Line Two	Suite 301
Entity Address, City or Town	Carnegie
Entity Address, State or Province	PA
Entity Address, Postal Zip Code	15106
City Area Code	412
Local Phone Number	456-4400
Entity Interactive Data Current	Yes
Entity Incorporation, State or Country Code	PA
Document Quarterly Report	true
Document Transition Report	false
Common Stock [Member]
Document Information [Line Items]
Trading Symbol	AP
Title of 12(b) Security	Common Stock, $1 par value
Security Exchange Name	NYSE
Series A Warrants [Member]
Document Information [Line Items]
Trading Symbol	AP WS
Title of 12(b) Security	Series A Warrants to purchase shares of Common Stock
Security Exchange Name	NYSEAMER

Condensed Consolidated Balance

Condensed Consolidated Balance Sheets (Unaudited) - USD ($) $ in Thousands	Sep. 30, 2024	Dec. 31, 2023
Current assets:
Cash and cash equivalents	$ 11,844	$ 7,286
Trade receivables, less allowance for credit losses of $903 as of September 30, 2024 and $975 as of December 31, 2023	74,727	78,939
Inventories	120,856	124,694
Insurance receivable - asbestos	15,000	15,000
Contract assets	6,864	4,452
Other current assets	6,905	5,370
Total current assets	238,707	236,653
Property, plant and equipment, net	152,530	158,732
Operating lease right-of-use assets	4,839	4,767
Insurance receivable - asbestos, less allowance for credit losses of $708 as of September 30, 2024 and December 31, 2023	131,404	145,245
Deferred income tax assets	3,160	3,160
Intangible assets, net	4,682	4,947
Investments in joint ventures	2,175	2,175
Prepaid pensions	5,415	4,951
Other noncurrent assets	4,501	5,024
Total assets	547,413	565,654
Current liabilities:
Accounts payable	29,772	36,830
Accrued payrolls and employee benefits	15,805	14,703
Debt – current portion	14,268	12,271
Operating lease liabilities – current portion	979	946
Asbestos liability – current portion	24,000	24,000
Other current liabilities	32,849	27,734
Total current liabilities	119,739	116,885
Employee benefit obligations	33,240	41,684
Asbestos liability	196,069	214,679
Long-term debt	116,010	116,382
Noncurrent operating lease liabilities	3,860	3,822
Deferred income tax liabilities	400	543
Other noncurrent liabilities	4,419	88
Total liabilities	473,737	494,083
Commitments and contingent liabilities (Note 8)
Shareholders’ equity:
Common stock - par value $1; authorized 40,000 shares; issued and outstanding 19,980 shares as of September 30, 2024 and 19,729 shares as of December 31, 2023	19,980	19,729
Additional paid-in capital	177,926	177,196
Retained deficit	(75,661)	(72,997)
Accumulated other comprehensive loss	(60,903)	(62,989)
Total Ampco-Pittsburgh shareholders’ equity	61,342	60,939
Noncontrolling interest	12,334	10,632
Total shareholders’ equity	73,676	71,571
Total liabilities and shareholders’ equity	547,413	565,654
Related Party [Member]
Current assets:
Trade receivables from related parties	2,511	912
Current liabilities:
Accounts payable to related parties	$ 2,066	$ 401

Condensed Consolidated Balanc_2

Condensed Consolidated Balance Sheets (Unaudited) (Parenthetical) - USD ($) $ in Thousands	Sep. 30, 2024	Dec. 31, 2023
Statement of Financial Position [Abstract]
Allowance for credit losses	$ 903	$ 975
Insurance receivable - asbestos	$ 708	$ 708
Common stock, par value	$ 1	$ 1
Common stock, shares authorized	40,000,000	40,000,000
Common stock, shares issued	19,980,000	19,729,000
Common stock, shares outstanding	19,980,000	19,729,000

Condensed Consolidated Statemen

Condensed Consolidated Statements of Operations (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Net sales:
Net sales	$ 92,072	$ 102,200	$ 305,102	$ 311,491
Total net sales	96,166	102,218	317,369	314,232
Operating costs and expenses:
Costs of products sold (excluding depreciation and amortization)	76,389	84,490	256,563	256,333
Selling and administrative	13,332	11,821	39,855	38,101
Depreciation and amortization	4,586	4,382	13,954	13,110
Credit for asbestos litigation		(191)		(191)
(Gain) loss on disposal of assets	(11)	(6)	2	(124)
Total operating costs and expenses	94,296	100,496	310,374	307,229
Income from operations	1,870	1,722	6,995	7,003
Other expense - net:
Investment-related income	77	98	104	114
Interest expense	(2,976)	(2,468)	(8,750)	(6,784)
Other income - net	211	1,959	2,496	3,424
Total other expense - net	(2,688)	(411)	(6,150)	(3,246)
(Loss) income before income taxes	(818)	1,311	845	3,757
Income tax provision	(636)	(76)	(1,953)	(541)
Net (loss) income	(1,454)	1,235	(1,108)	3,216
Less: Net income attributable to noncontrolling interest	505	426	1,556	1,308
Net (loss) income attributable to Ampco-Pittsburgh	$ (1,959)	$ 809	$ (2,664)	$ 1,908
Net income (loss) per share attributable to Ampco-Pittsburgh common shareholders:
Basic	$ (0.1)	$ 0.04	$ (0.13)	$ 0.1
Diluted	$ (0.1)	$ 0.04	$ (0.13)	$ 0.1
Weighted-average number of common shares outstanding:
Basic	19,980	19,729	19,857	19,580
Diluted	19,980	19,729	19,857	19,633
Related Party [Member]
Net sales:
Net sales to related parties	$ 4,094	$ 18	$ 12,267	$ 2,741

Condensed Consolidated Statem_2

Condensed Consolidated Statements of Comprehensive (Loss) Income (Unaudited) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Statement of Comprehensive Income [Abstract]
Net (loss) income	$ (1,454)	$ 1,235	$ (1,108)	$ 3,216
Adjustments for changes in:
Foreign currency translation	5,852	(3,150)	3,130	(2,113)
Unrecognized employee benefit costs (including effects of foreign currency translation)	(537)	181	(468)	45
Fair value of cash flow hedges	174	19	384	(81)
Reclassification adjustments for items included in net (loss) income:
Amortization of unrecognized employee benefit costs	(177)	(235)	(534)	(728)
Settlements of cash flow hedges	(13)	135	(280)	(52)
Other comprehensive income (loss)	5,299	(3,050)	2,232	(2,929)
Comprehensive income (loss)	3,845	(1,815)	1,124	287
Less: Comprehensive income attributable to noncontrolling interest	924	367	1,702	771
Comprehensive income (loss) attributable to Ampco-Pittsburgh	$ 2,921	$ (2,182)	$ (578)	$ (484)

Condensed Consolidated Statem_3

Condensed Consolidated Statements of Shareholders' Equity (Unaudited) - USD ($) $ in Thousands	Total	Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Deficit [Member]	Accumulated Other Comprehensive Loss [Member]	Noncontrolling Interest [Member]
Beginning Balance at Dec. 31, 2022	$ 112,649	$ 19,404	$ 175,656	$ (33,069)	$ (58,412)	$ 9,070
Stock-based compensation	1,630		1,630
Comprehensive income (loss):
Net (loss) income	3,216			1,908		1,308
Other comprehensive income (loss)	(2,929)				(2,392)	(537)
Comprehensive income (loss)	287					771
Issuance of common stock excluding excess tax benefits	(281)	325	(606)
Ending Balance at Sep. 30, 2023	114,285	19,729	176,680	(31,161)	(60,804)	9,841
Beginning Balance at Jun. 30, 2023	115,580	19,729	176,160	(31,970)	(57,813)	9,474
Stock-based compensation	520		520
Comprehensive income (loss):
Net (loss) income	1,235			809		426
Other comprehensive income (loss)	(3,050)				(2,991)	(59)
Comprehensive income (loss)	(1,815)					367
Ending Balance at Sep. 30, 2023	114,285	19,729	176,680	(31,161)	(60,804)	9,841
Beginning Balance at Dec. 31, 2023	71,571	19,729	177,196	(72,997)	(62,989)	10,632
Stock-based compensation	1,106		1,106
Comprehensive income (loss):
Net (loss) income	(1,108)			(2,664)		1,556
Other comprehensive income (loss)	2,232				2,086	146
Comprehensive income (loss)	1,124					1,702
Issuance of common stock excluding excess tax benefits	(125)	251	(376)
Ending Balance at Sep. 30, 2024	73,676	19,980	177,926	(75,661)	(60,903)	12,334
Beginning Balance at Jun. 30, 2024	69,459	19,980	177,554	(73,702)	(65,783)	11,410
Stock-based compensation	372		372
Comprehensive income (loss):
Net (loss) income	(1,454)			(1,959)		505
Other comprehensive income (loss)	5,299				4,880	419
Comprehensive income (loss)	3,845					924
Ending Balance at Sep. 30, 2024	$ 73,676	$ 19,980	$ 177,926	$ (75,661)	$ (60,903)	$ 12,334

Condensed Consolidated Statem_4

Condensed Consolidated Statements of Shareholders' Equity (Unaudited) (Parenthetical) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023
Common Stock [Member]
Issuance of common stock tax benefits	$ 0	$ 0
Additional Paid-in Capital [Member]
Issuance of common stock tax benefits	$ 0	$ 0

Condensed Consolidated Statem_5

Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023
Statement of Cash Flows [Abstract]
Net cash flows provided by (used in) operating activities	$ 10,576	$ (10,327)
Cash flows used in investing activities:
Purchases of property, plant and equipment	(8,443)	(14,134)
Proceeds from government grants, used for purchase of equipment	1,293
Proceeds from sale of property, plant and equipment	10	128
Purchases of long-term marketable securities	(364)	(70)
Proceeds from sale of long-term marketable securities	847	561
Net cash flows used in investing activities	(6,657)	(13,515)
Cash flows from financing activities:
Proceeds from revolving credit facility	18,396	28,205
Payments on revolving credit facility	(17,172)	(15,693)
Proceeds from sale and leaseback financing arrangements		2,500
Payments on sale and leaseback financing arrangements	(263)	(180)
Proceeds from equipment financing facility	1,692	6,822
Payments on equipment financing facility	(1,120)
Proceeds from related party debt		1,099
Repayments of related party debt	(664)	(1,096)
Repayments of debt	(312)	(334)
Net cash flows provided by financing activities	557	21,323
Effect of exchange rate changes on cash and cash equivalents	82	(146)
Net increase (decrease) in cash and cash equivalents	4,558	(2,665)
Cash and cash equivalents at beginning of period	7,286	8,735
Cash and cash equivalents at end of period	11,844	6,070
Supplemental information:
Income tax payments (net of refunds)	2,181	1,787
Interest payments (net of amounts capitalized)	7,663	5,739
Non-cash investing and financing activities:
Purchases of property, plant and equipment in current liabilities	516	2,365
Finance lease right-of-use assets exchanged for lease liabilities	146	144
Operating lease right-of-use assets exchanged for lease liabilities	$ 550	$ 1,953

Pay vs Performance Disclosure

Pay vs Performance Disclosure - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Pay vs Performance Disclosure
Net Income (Loss)	$ (1,959)	$ 809	$ (2,664)	$ 1,908

Insider Trading Arrangements

Insider Trading Arrangements	3 Months Ended
	Sep. 30, 2024
Trading Arrangements, by Individual
Rule 10b5-1 Arrangement Adopted	false
Non-Rule 10b5-1 Arrangement Adopted	false
Rule 10b5-1 Arrangement Terminated	false
Non-Rule 10b5-1 Arrangement Terminated	false

Unaudited Condensed Consolidate

Unaudited Condensed Consolidated Financial Statements	9 Months Ended
	Sep. 30, 2024
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Unaudited Condensed Consolidated Financial Statements	Note 1 – Unaudited Condensed Consolidated Financial Statements The unaudited condensed consolidated balance sheet as of September 30, 2024 and the unaudited condensed consolidated statements of operations, comprehensive income (loss) and shareholders’ equity for the three and nine months ended September 30, 2024 and 2023, and cash flows for the nine months ended September 30, 2024 and 2023 have been prepared by the Corporation. In the opinion of management, all adjustments, consisting of only normal and recurring adjustments necessary to present fairly the financial position, results of operations and cash flows for the periods presented, have been made. The results of operations for the three and nine months ended September 30, 2024 are not necessarily indicative of the operating results expected for the full year. Certain information and footnote disclosures normally included in the annual financial statements prepared in accordance with accounting principles generally accepted in the United States of America (“GAAP”) have been condensed or omitted. These unaudited condensed consolidated financial statements should be read in conjunction with the Corporation’s latest Annual Report on Form 10-K. Recently Issued Accounting Pronouncements In November 2024, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update (“ASU”) 2024-03, Income Statement - Dissaggregation of Income Statement Expenses . The guidance requires tabular disclosure of certain expenses included in costs of products sold and selling and administrative expenses, such as purchases of inventory and employee compensation, and qualitative description of certain other costs. The guidance becomes effective for the Corporation’s annual period beginning January 1, 2027 and interim periods beginning January 1, 2028. The Corporation is currently evaluating the impact this new standard will have on its annual disclosures in its consolidated financial statements for the year ending December 31, 2027 and interim disclosures thereafter. It will not, however, impact the Corporation’s consolidated financial position, results of operations or cash flows. In November 2023, the FASB issued ASU 2023-07, Segment Reporting - Improvements to Reportable Segment Disclosures . The guidance requires disclosure of significant reportable segment expenses regularly provided to the chief operating decision-maker and included within each reported measure of a segment’s profit or loss. The guidance also requires disclosure of the title and position of the individual identified as the chief operating decision-maker and an explanation of how the chief operating decision-maker uses the reported measures of a segment’s profit or loss in assessing segment performance and deciding how to allocate resources. The guidance does not change how an entity identifies its operating segments, aggregates those operating segments, or applies the quantitative thresholds to determine its reportable segments. The guidance became effective for the Corporation’s annual period beginning January 1, 2024 and interim periods beginning January 1, 2025. The Corporation is currently evaluating the impact this new standard will have on its annual disclosures in its consolidated financial statements for the year ending December 31, 2024 and interim disclosures thereafter. It will not, however, impact the Corporation’s consolidated financial position, results of operations or cash flows. In December 2023, the FASB issued ASU 2023-09, Income Taxes - Improvements to Income Tax Disclosures . The guidance requires annual disclosure of specific categories of information within the effective tax rate reconciliation, and income taxes paid and income tax expense disaggregated by jurisdiction. The guidance becomes effective for the Corporation’s annual period beginning January 1, 2025. Early adoption is permitted. The Corporation is currently evaluating the impact this new standard will have on its annual disclosures. It will not, however, impact the Corporation’s consolidated financial position, results of operations or cash flows.

Inventories

Inventories	9 Months Ended
	Sep. 30, 2024
Inventory Disclosure [Abstract]
Inventories	Note 2 – Inventories At September 30, 2024 and December 31, 2023 , substantially all inventories were valued using the first-in, first-out method. Inventories were comprised of the following: September 30, December 31, Raw materials $ 48,981 $ 51,794 Work-in-process 50,228 48,676 Finished goods 14,136 17,332 Supplies 7,511 6,892 Inventories $ 120,856 $ 124,694

Property, Plant and Equipment

Property, Plant and Equipment	9 Months Ended
	Sep. 30, 2024
Property, Plant and Equipment [Abstract]
Property, Plant and Equipment	Note 3 – Property, Plant and Equipment Property, plant and equipment were comprised of the following: September 30, December 31, Land and land improvements $ 9,038 $ 9,025 Buildings and leasehold improvements 71,711 71,063 Machinery and equipment 382,253 366,044 Construction-in-progress 3,580 11,514 Other 6,299 6,965 472,881 464,611 Accumulated depreciation and amortization ( 320,351 ) ( 305,879 ) Property, plant and equipment, net $ 152,530 $ 158,732 Certain of the above property, plant and equipment are held as collateral including: • The land and buildi ng of Union Electric Steel UK Limited (“UES-UK”), an indirect subsidiary of the Corporation, with a book value equal to $ 2,841 (£ 2,122 ) at September 30, 2024, are held as collateral by the trustees of the UES-UK defined benefit pension plan ( Note 7 ). • Certain of the machinery and equipment with a book value equal to $ 24,239 at September 30, 2024, purchased with proceeds from the equipment finance facility ( Note 6 ), are held as collateral by the lender. • Certain land and land improvements and buildings and leasehold improvements are included in the sale and leaseback financing transactions and Disbursement Agreement ( Note 6 ). Title to these assets lies with the lender; however, since the transactions qualified as financing transactions, versus sales, the assets remain recorded on the Corporation’s condensed consolidated balance sheet. • The remaining assets, other than real property, are pledged as collateral for the Corporation’s revolving credit facility ( Note 6 ). In 2023, Union Electric Steel Corporation (“UES”), a wholly owned subsidiary of the Corporation, completed certain leasehold improvements at the Carnegie, Pennsylvania manufacturing facility with the $ 2,500 of proceeds from the Disbursement Agreement ( Note 6 ) . The improvements are being amortized over the remaining lease term of 20 years . In 2021, the Corporation began a $ 26,000 long-term strategic capital program to upgrade existing equipment at certain of its FCEP locations. The program was completed and the assets were placed in service during the first half of 2024. Interest capitalized related to the strategic capital program approximated $ 251 for the nine months ended September 30, 2024 and $ 425 and $ 1,027 for the three and nine months ended September 30, 2023, respectively. No interest was c apitalized for the three months ended September 30, 2024. The gross value of assets under finance leases and the related accumulated amortization approximated $ 3,539 and $ 1,876 , respectively, as of September 30, 2024 and $ 4,223 and $ 1,959 , respectively, at December 31, 2023 . Depreciation expense approximated $ 4,497 and $ 4,295 , including depreciation of assets under finance leases of approximately $ 80 and $ 115 , for the three months ended September 30, 2024 and 2023 , respectively. Depreciation expense approximated $ 13,692 and $ 12,844 , including depreciation of assets under finance leases of approximately $ 242 and $ 252 , for the nine months ended September 30, 2024 and 2023 , respectively.

Intangible Assets

Intangible Assets	9 Months Ended
	Sep. 30, 2024
Goodwill and Intangible Assets Disclosure [Abstract]
Intangible Assets	Note 4 – Intangible Assets Intangible assets were comprised of the following: September 30, December 31, Customer relationships $ 5,395 $ 5,442 Developed technology 3,966 3,913 Trade name 2,220 2,219 11,581 11,574 Accumulated amortization ( 6,899 ) ( 6,627 ) Intangible assets, net $ 4,682 $ 4,947 Changes in intangible assets consisted of the following: Three Months Ended September 30, Nine Months Ended September 30, 2024 2023 2024 2023 Balance at beginning of the period $ 4,574 $ 4,859 $ 4,947 $ 5,194 Amortization of intangible assets ( 89 ) ( 87 ) ( 262 ) ( 266 ) Other, primarily impact from changes in foreign currency exchange rates 197 ( 45 ) ( 3 ) ( 201 ) Balance at end of the period $ 4,682 $ 4,727 $ 4,682 $ 4,727

Other Current Liabilities

Other Current Liabilities	9 Months Ended
	Sep. 30, 2024
Other Liabilities Disclosure [Abstract]
Other Current Liabilities	Note 5 – Other Current Liabilities Other current liabilities were comprised of the following: September 30, December 31, Customer-related liabilities $ 24,971 $ 19,915 Accrued utilities 1,885 1,880 Accrued sales commissions 1,800 1,850 Other 4,193 4,089 Other current liabilities $ 32,849 $ 27,734 Customer-related liabilities primarily include liabilities for product warranty claims and deposits received on future orders. The Corporation provides a limited warranty on its products, known as assurance-type warranties, and may issue credit notes or replace products free of charge for valid claims. A warranty is considered an assurance-type warranty if it provides the customer with assurance that the product will function as intended. Historically, warranty claims have been insignificant. The Corporation records a provision for estimated product warranties at the time the underlying sale is recorded. The provision is based on historical experience as a percentage of sales adjusted for probable and known claims. Changes in the liability for product warranty claims consisted of the following: Three Months Ended September 30, Nine Months Ended September 30, 2024 2023 2024 2023 Balance at beginning of the period $ 5,175 $ 5,639 $ 5,539 $ 5,193 Satisfaction of warranty claims ( 330 ) ( 304 ) ( 1,016 ) ( 1,280 ) Provision for warranty claims, net 440 62 884 1,439 Other, primarily impact from changes in foreign currency exchange rates 215 ( 110 ) 93 ( 65 ) Balance at end of the period $ 5,500 $ 5,287 $ 5,500 $ 5,287 Customer deposits represent amounts collected from, or invoiced to, a customer in advance of revenue recognition when necessary to secure the right to a specific product. The liability for customer deposits is reversed when the Corporation satisfies its performance obligations and control of the inventory transfers to the customer, typically when title transfers. The majority of performance obligations related to customer deposits are expected to be satisfied in less than one year . Performance obligations related to customer deposits expected to be satisfied beyond one year have been classified as a noncurrent liability. Changes in customer deposits consisted of the following: Three Months Ended September 30, Nine Months Ended September 30, 2024 2023 2024 2023 Balance at beginning of the period $ 18,807 $ 11,506 $ 13,078 $ 10,453 Satisfaction of performance obligations ( 6,156 ) ( 7,602 ) ( 13,541 ) ( 17,182 ) Receipt of additional deposits 9,759 5,266 22,892 15,886 Other, primarily impact from changes in foreign currency exchange rates 89 ( 22 ) 70 ( 9 ) Balance at end of the period 22,499 9,148 22,499 9,148 Deposits - Other noncurrent liabilities ( 4,213 ) - ( 4,213 ) - Deposits - Other current liabilities $ 18,286 $ 9,148 $ 18,286 $ 9,148

Debt

Debt	9 Months Ended
	Sep. 30, 2024
Debt Disclosure [Abstract]
Debt	Note 6 – Debt Borrowings were comprised of the following: September 30, December 31, Revolving credit facility $ 57,224 $ 56,000 Sale and leaseback financing obligations 45,227 44,488 Equipment financing facility 17,291 16,719 Industrial Revenue Bonds 9,191 9,191 Finance lease liabilities 1,345 1,590 Minority shareholder loan - 665 Outstanding borrowings 130,278 128,653 Debt – current portion ( 14,268 ) ( 12,271 ) Long-term debt $ 116,010 $ 116,382 The current portion of debt includes primarily swing loans under the revolving credit facility and the Industrial Revenue Bonds (“IRBs”). By definition, swing loans are temporary advances under the revolving credit facility and short term in nature. Accordingly, swing loans are classified as a current liability until the amount is either repaid, as customers remit payments, or, if elected by the Corporation, refinanced as a longer-term loan under the revolving credit facility. The swing loans equaled $ 2,224 at September 30, 2024 . No amount was outstanding as a swing loan at December 31, 2023. Although the IRBs begin to become due in 2027, the bonds can be put back to the Corporation on short notice if they are not able to be remarketed; accordingly, the IRBs are classified as a current liability, although the Corporation considers the likelihood of the bonds being put back to the Corporation to be remote. Revolving Credit Facility The Corporation is a party to a revolving credit and security agreement with a syndicate of banks that was amended on June 29, 2021 (the “First Amended and Restated Security Agreement”), and subsequently amended on December 17, 2021 and May 26, 2022. The First Amended and Restated Security Agreement provides for a senior secured asset-based revolving credit facility of $ 100,000 , that can be increased to $ 130,000 at the option of the Corporation and with the approval of the lenders, and an allowance of $ 20,000 for new equipment financing (see “Equipment Financing Facility” below) but, otherwise, restricts the Corporation from incurring additional indebtedness outside of the agreement, unless approved by the banks. The revolving credit facility includes sub-limits for letters of credit not to exceed $ 40,000 and European borrowings not to exceed $ 30,000 , of which up to $ 7,500 may be allocated for Swedish borrowings. The maturity date for the revolving credit facility is June 29, 2026 and, subject to other terms and conditions of the agreement, would become due on that date. Availability under the revolving credit facility is based on eligible accounts receivable, inventory and fixed assets. Effective July 1, 2023, the Corporation migrated London Inter-Bank Offered Rate (“LIBOR”)-based loans to Secured Overnight Financing Rate (“SOFR”)-based loans, in accordance with the provisions specified in the revolving credit facility, coinciding with the discontinuation of LIBOR. European borrowings denominated in euros, pound sterling or krona bear interest at the Successor Rate as defined in the First Amended and Restated Security Agreement, as amended. Domestic borrowings from the revolving credit facility bear interest, at the Corporation’s option, at either (i) SOFR, as adjusted, plus an applicable margin ranging between 2.00 % to 2.50 % based on the quarterly average excess availability or (ii) the alternate base rate plus an applicable margin ranging between 1.00 % to 1.50 % based on the quarterly average excess availability. As of September 30, 2024 and December 31, 2023 , there were no European borrowings outstanding. Additionally, the Corporation is required to pay a commitment fee of 0.25 % based on the daily unused portion of the revolving credit facility. As of September 30, 2024, the Corporation had outstanding borrowings under the revolving credit facility of $ 57,224 . The average interest rate approximated 8.26 % and 8.24 % for the three and nine months ended September 30, 2024 , respectively, and 8.32 % and 7.97 % for the three and nine months ended September 30, 2023, respectively. The Corporation also utilizes a portion of the revolving credit facility for letters of credit ( Note 8 ). As of September 30, 2024, remaining availability under the revolving credit facility approximated $ 20,507 , net of standard availability reserves. Borrowings outstanding under the revolving credit facility are collateralized by a first priority perfected security interest in substantially all assets of the Corporation and its subsidiaries (other than real property). Additionally, the revolving credit facility contains customary affirmative and negative covenants and limitations including, but not limited to, investments in certain of its subsidiaries, payment of dividends, incurrence of additional indebtedness and guaranties, and acquisitions and divestitures. In addition, the Corporation must maintain a certain level of excess availability or otherwise maintain a minimum fixed charge coverage ratio of not less than 1.05 to 1.00. The Corporation was in compliance with the applicable bank covenants as of September 30, 2024. Sale and Leaseback Financing Obligations In September 2018, UES completed a sale and leaseback financing transaction with Store Capital Acquisitions, LLC (“STORE”) for certain of its real property, including its manufacturing facilities in Valparaiso, Indiana and Burgettstown, Pennsylvania, and its manufacturing facility and corporate headquarters located in Carnegie, Pennsylvania (the “UES Properties”). In August 2022, Air & Liquid Systems Corporation (“Air & Liquid”), a wholly owned subsidiary of the Corporation, completed a sale and leaseback financing transaction with STORE for certain of its real property, including its manufacturing facilities in Lynchburg, Virginia and Amherst, Virginia. In October 2022, Air & Liquid completed a sale and leaseback financing transaction with STORE for its real property, including its manufacturing facility, located in North Tonawanda, New York (collectively with the Virginia properties, the “ALP Properties”). In connection with the August 2022 sale and leaseback financing transaction, and as modified by the October 2022 sale and leaseback financing transaction, UES and STORE entered into a Second Amended and Restated Master Lease Agreement (the “Restated Lease”), which amended and restated the existing lease agreement between UES and STORE. Pursuant to the Restated Lease, UES will lease the ALP Properties and the UES Properties (collectively, the “Properties”), subject to the terms and conditions of the Restated Lease, and UES will sublease the ALP Properties to Air & Liquid on the same terms as the Restated Lease. The Restated Lease provides for an initial term of 20 years; however, UES may extend the lease for the Properties for four successive periods of five years each. If fully extended, the Restated Lease would expire in August 2062 . UES also has the option to repurchase the Properties, which it may, and intends to, exercise in 2032, for a price equal to the greater of (i) the Fair Market Value of the Properties, or (ii) 115 % of Lessor’s Total Investment, with such terms defined in the Restated Lease. In August 2022, in connection with the Restated Lease, UES and STORE entered into a Disbursement Agreement pursuant to which STORE agreed to provide up to $ 2,500 to UES towards certain leasehold improvements in the Carnegie, Pennsylvania manufacturing facility. In June 2023, UES received $ 2,500 of proceeds from the Disbursement Agreement. The annual payments for the Properties (the “Base Annual Rent”) have been adjusted to repay the $ 2,500 over the balance of the initial term of the Restated Lease of 20 years. Advances under the Disbursement Agreement are secured by a first priority security interest in the leasehold improvements. At September 30, 2024, the Base Annual Rent, including the Disbursement Agreement, is equal to $ 3,645 , payabl e in equal monthly installments. Each October through 2052, the Base Annual Rent will increase by an amount equal to the lesser of 2.04 % or 1.25 times the change in the consumer price index, as defined in the Restated Lease. The Base Annual Rent during the remaining ten years of the Restated Lease will be equal to the Fair Market Rent, as defined in the Restated Lease. Effective October 1, 2024, the new Base Annual Rent is $ 3,719 , an increase of 2.04 %. The Restated Lease and the Disbursement Agreement contain certain representations, warranties, covenants, obligations, conditions, indemnification provisions, and termination provisions customary for those types of agreements. The Corporation was in compliance with the applicable covenants as of September 30, 2024. The effective interest rate approximated 8.25 % and 8.24 % for the three and nine months ended September 30, 2024 , respectively, and approximated 8.89 % and 8.36 % for the three and nine months ended September 30, 2023, respectively. Equipment Financing Facility In September 2022, UES and Clarus Capital Funding I, LLC (“Clarus”) entered into a Master Loan and Security Agreement, pursuant to which UES could borrow up to $ 20,000 to finance certain equipment purchases associated with a capital program at certain of the Corporation’s FCEP lo cations. Each borrowing constitutes a secured loan transaction (each, a “Term Loan”). As amended, each Term Loan converts to a Term Note on the earlier of (i) the date in which the associated equipment is placed in service or (ii) April 30, 2024. Each Term Note has a term of 84 months in arrears fully amortizing, commencing on the date of the Term Note. The Term Loans and Term Notes are secured by a first priority security interest in and to all of UES’ rights, title and interests in the underlying equipment. Through June 30, 2023, interest on each Term Loan accrued at an annual fixed rate of 8 %, payable monthly. Effective July 1, 2023, UES and Clarus amended the Master Loan and Security Agreement increasing the interest rate on each Term Loan from an annual fixed rate of 8 % to an annual fixed rate of 10.25 %. All Term Loans have converted to Term Notes and approximately $ 17,291 is outstanding as of September 30, 2024. At December 31, 2023, Term Notes approximated $ 900 and Term Loans approximated $ 15,819 . Interest on each Term Note accrues at an annual fixed rate ranging between 8.40 % and 9.22 %. The effective interest rate on the Term Not es approximated 8.69 % and 8.60 % for the three and nine months ended September 30, 2024, respectively. As of September 30, 2024, monthly payments of principal and interest approximate $ 293 a nd continue through mid 2031 . Industrial Revenue Bonds (“IRBs”) The Corporation has two IRBs outstanding: (i) $ 7,116 taxable IRB maturing in 2027, interest at a floating rate which averaged 5.40 % and 5.39 % for the three months ended September 30, 2024 and 2023 , respectively, and 5.40 % and 5.04 % for the nine months ended September 30, 2024 and 2023 , respectively, and (ii) $ 2,075 tax-exempt IRB maturing in 2029, interest at a floating rate which averaged 3.62 % and 4.19 % for the three months ended September 30, 2024 and 2023 , respectively, and 3.80 % and 3.63 % for the nine months ended September 30, 2024 and 2023, respectively. The IRBs are secured by letters of credit of equivalent amounts and are remarketed periodically at which time the interest rates are reset. If the IRBs are not able to be remarketed, although considered a remote possibility by the Corporation, the bondholders can seek reimbursement immediately from the letters of credit; accordingly, the IRBs are recorded as current debt on the condensed consolidated balance sheets. Minority Shareholder Loan Shanxi Åkers TISCO Roll Co., Ltd. (“ATR” ), a 59.88 % indirectly owned joint venture of UES, periodically has loans outstanding with its minority shareholder ( Note 17 ). Amounts repaid appro ximated $ 664 (RMB 4,713 ) d uring the nine months ended September 30, 2024. Amounts borrowed and repaid approximated $ 1,099 (RMB 7,604 ) and $ 1,096 (RMB 7,604 ) during the nine months ended September 30, 2023 , respectively.

Pension and Other Postretiremen

Pension and Other Postretirement Benefits	9 Months Ended
	Sep. 30, 2024
Retirement Benefits [Abstract]
Pension and Other Postretirement Benefits	Note 7 – Pension and Other Postretirement Benefits Contributions to the Corporation’s employee benefit plans were as follows: Nine Months Ended September 30, 2024 2023 U.S. defined benefit pension plans $ 4,641 $ 207 U.S. defined benefit nonqualified pension plans (e.g. payments) $ 576 $ 576 Foreign defined benefit pension plans $ 327 $ 377 Other postretirement benefits (e.g., net payments) $ 273 $ 325 U.K. defined contribution pension plan $ 200 $ 175 U.S. defined contribution plan $ 2,457 $ 2,002 Net periodic pension and other postretirement benefit costs included the following components: Three Months Ended September 30, Nine Months Ended September 30, U.S. Defined Benefit Pension Plans (a) 2024 2023 2024 2023 Service cost $ 2 $ 10 $ 22 $ 29 Interest cost 2,331 2,483 6,988 7,450 Expected return on plan assets ( 3,443 ) ( 3,596 ) ( 10,245 ) ( 10,788 ) Amortization of prior service cost - 2 1 5 Amortization of actuarial loss 45 30 136 91 Net benefit income $ ( 1,065 ) $ ( 1,071 ) $ ( 3,098 ) $ ( 3,213 ) a) Includes the nonqualified defined benefit pension plan. Three Months Ended September 30, Nine Months Ended September 30, Foreign Defined Benefit Pension Plans 2024 2023 2024 2023 Service cost $ 63 $ 87 $ 102 $ 225 Interest cost 467 468 1,375 1,391 Expected return on plan assets ( 490 ) ( 487 ) ( 1,443 ) ( 1,446 ) Amortization of prior service credit ( 72 ) ( 70 ) ( 213 ) ( 207 ) Amortization of actuarial loss 185 152 546 451 Net benefit expense $ 153 $ 150 $ 367 $ 414 Three Months Ended September 30, Nine Months Ended September 30, Other Postretirement Benefit Plans 2024 2023 2024 2023 Service cost $ 42 $ 43 $ 126 $ 128 Interest cost 90 98 271 293 Amortization of prior service credit ( 256 ) ( 256 ) ( 768 ) ( 768 ) Amortization of actuarial gain ( 79 ) ( 81 ) ( 236 ) ( 242 ) Net benefit income $ ( 203 ) $ ( 196 ) $ ( 607 ) $ ( 589 )

Commitments and Contingent Liab

Commitments and Contingent Liabilities	9 Months Ended
	Sep. 30, 2024
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingent Liabilities	Note 8 – Commitments and Contingent Liabilities Outstanding standby and commercial letters of credit and bank guarantees as of September 30, 2024 equaled $ 15,909 , of which approximately one-half serves as collateral for the IRB debt. Outstanding surety bonds as of September 30, 2024 approximated $ 3,351 (SEK 33,900 ), which guarantee certain obligations under a credit insurance arrangement for certain of the Corporation’s foreign pension commitments. At September 30, 2024, commitments for future capital expenditures approximated $ 6,000 . See Note 11 for derivative instruments, Note 15 for litigation and Note 16 for environmental matters.

Equity Rights Offering

Equity Rights Offering	9 Months Ended
	Sep. 30, 2024
Warrants and Rights Note Disclosure [Abstract]
Equity Rights Offering	Note 9 – Equity Rights Offering In September 2020, the Corporation completed an equity rights offering, issuing 5,507,889 shares of its common stock and 12,339,256 Series A warrants to existing shareholders. The shares of common stock and warrants are classified as equity instruments in the condensed consolidated statements of shareholders’ equity. Each Series A warrant provides the holder with the right to purchase 0.4464 shares of common stock at an exercise price of $ 2.5668 , or $ 5.75 per whole share of common stock, and expires on August 1, 2025 . For the three and nine months ended September 30, 2024 and 2023 , respectively, the Corporation received no proceeds from shareholders from the exercise of Series A warrants. At September 30, 2024 and December 31, 2023, 10,941,869 Series A warrants were outstanding.

Accumulated Other Comprehensive

Accumulated Other Comprehensive Loss	9 Months Ended
	Sep. 30, 2024
Equity [Abstract]
Accumulated Other Comprehensive Loss	Note 10 – Accumulated Other Comprehensive Loss Net change and ending balances for the various components of accumulated other comprehensive loss as of and for the nine months ended September 30, 2024 and 2023 are summarized below. All amounts are net of tax where applicable. Foreign Unrecognized Cash Flow Total Less: Accumulated Other Balance at January 1, 2024 $ ( 23,161 ) $ ( 40,490 ) $ 186 $ ( 63,465 ) $ ( 476 ) $ ( 62,989 ) Net change 3,130 ( 1,002 ) 104 2,232 146 2,086 Balance at September 30, 2024 $ ( 20,031 ) $ ( 41,492 ) $ 290 $ ( 61,233 ) $ ( 330 ) $ ( 60,903 ) Balance at January 1, 2023 $ ( 26,170 ) $ ( 32,623 ) $ 152 $ ( 58,641 ) $ ( 229 ) $ ( 58,412 ) Net change ( 2,113 ) ( 683 ) ( 133 ) ( 2,929 ) ( 537 ) ( 2,392 ) Balance at September 30, 2023 $ ( 28,283 ) $ ( 33,306 ) $ 19 $ ( 61,570 ) $ ( 766 ) $ ( 60,804 ) The following summarizes the line items affected on the condensed consolidated statements of operations for components reclassified from accumulated other comprehensive loss. Amounts in parentheses represent credits to net (loss) income. Three Months Ended September 30, Nine Months Ended September 30, 2024 2023 2024 2023 Amortization of unrecognized employee benefit costs: Other loss – net $ ( 177 ) $ ( 223 ) $ ( 534 ) $ ( 670 ) Income tax effect - ( 12 ) - ( 58 ) Net of tax $ ( 177 ) $ ( 235 ) $ ( 534 ) $ ( 728 ) Settlements of cash flow hedges: Depreciation and amortization (foreign currency purchase contracts) $ ( 6 ) $ ( 6 ) $ ( 20 ) $ ( 20 ) Costs of products sold (excluding depreciation and ( 7 ) 146 ( 267 ) ( 33 ) Total before income tax ( 13 ) 140 ( 287 ) ( 53 ) Income tax effect - ( 5 ) 7 1 Net of tax $ ( 13 ) $ 135 $ ( 280 ) $ ( 52 ) The income tax effect associated with the various components of other comprehensive income (loss) for the three and nine months ended September 30, 2024 and 2023 is summarized below. Amounts in parentheses represent credits to net (loss) income when reclassified to earnings. Certain amounts have no tax effect due to the Corporation having a valuation allowance recorded against the deferred income tax assets for the jurisdiction where the income or expense is recognized. Foreign currency translation adjustments exclude the effect of income taxes since earnings of non-U.S. subsidiaries are deemed to be reinvested for an indefinite period of time. Three Months Ended September 30, Nine Months Ended September 30, 2024 2023 2024 2023 Income tax effect associated with changes in: Unrecognized employee benefit costs $ - $ - $ - $ - Fair value of cash flow hedges $ ( 5 ) $ - $ ( 10 ) $ 3 Income tax effect associated with reclassification adjustments: Amortization of unrecognized employee benefit costs $ - $ ( 12 ) $ - $ ( 58 ) Settlement of cash flow hedges $ - $ ( 5 ) $ 7 $ 1

Derivative Instruments

Derivative Instruments	9 Months Ended
	Sep. 30, 2024
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Derivative Instruments	Note 11 – Derivative Instruments Certain divisions of the ALP segment are subject to risk from increases in the price of commodities (copper and aluminum) used in the production of inventory. To minimize this risk, futures contracts are entered into which are designated as cash flow hedges. At September 30, 2024 , approximately 43 %, or $ 2,853, of anticipated copper purchases over the next nine months and 56 %, or $ 615 , of anticipated aluminum purchases over the next six months are hedged. At September 30, 2023 , approximately 46 %, or $ 2,771 , of anticipated copper purchases over the next ten months and 56 %, or $ 565 , of anticipated aluminum purchases over the next six months were hedged. The Corporation periodically enters into purchase commitments to cover a portion of its anticipated natural gas and electricity usage. The commitments qualify as normal purchases and, accordingly, are not reflected on the condensed consolidated balance sheets. At September 30, 2024 , the Corporation has purchase commitments covering approximately 3 %, or $ 1,568 , of anticipated natural gas usage through December 31, 2025 for two of its subsidiaries and approximately 9 %, or $ 945 , of anticipated electricity usage through December 31, 2025 for two of its subsidiaries. At September 30, 2023 , the Corporation had purchase commitments covering approximately 32 %, or $ 2,942 , of anticipated natural gas usage through December 31, 2025 for one of its subsidiaries and approximately 21 %, or $ 1,116 , of anticipated electricity usage through December 31, 2025 for one of its subsidiaries . Purchases of natural gas and electricity under previously existing commitments equaled $ 674 and $ 2,507 for the three and nine months ended September 30, 2024 , respectively, and $ 812 and $ 2,249 for the three and nine months ended September 30, 2023, respectively. The Corporation previously entered into foreign currency purchase contracts to manage the volatility associated with euro-denominated progress payments to be made for certain machinery and equipment. Upon occurrence of an anticipated purchase and placement of the underlying fixed asset in service, the foreign currency purchase contract was settled and the change in fair value of the foreign currency purchase contract was deferred in accumulated other comprehensive loss and is being reclassified to earnings (depreciation and amortization expense) over the life of the underlying asset (approximately 15 years). No portion of the existing cash flow hedges is considered to be ineffective, including any ineffectiveness arising from the unlikelihood of an anticipated transaction to occur. Additionally, no amounts have been excluded from assessing the effectiveness of a hedge. The Corporation does not enter into derivative transactions for speculative purposes and, therefore, holds no derivative instruments for trading purposes. (Loss) gain on foreign exchange transactions included in other expense – net equaled $ ( 1,130 ) and $ ( 1,320 ) for the three and nine months ended September 30, 2024 , respectively, and $ 892 and $ ( 267 ) for the three and nine months ended September 30, 2023, respectively. The change in the fair value of the cash flow contracts is recorded as a component of accumulated other comprehensive loss. The balances as of September 30, 2024 and 2023 and the amounts recognized as and reclassified from accumulated other comprehensive loss for each of the periods are summarized below. Amounts are after tax where applicable. Certain amounts recognized as comprehensive income (loss) or reclassified from accumulated other comprehensive loss have no tax effect due to the Corporation having a valuation allowance recorded against the deferred income tax assets for the jurisdiction where the income or expense is recognized. Three Months Ended September 30, 2024 Beginning of Recognized Reclassified End of Foreign currency purchase contracts $ 67 $ - $ 6 $ 61 Futures contracts – copper and aluminum 62 174 7 229 $ 129 $ 174 $ 13 $ 290 Three Months Ended September 30, 2023 Foreign currency purchase contracts $ 94 $ - $ 6 $ 88 Futures contracts – copper and aluminum ( 229 ) 19 ( 141 ) ( 69 ) $ ( 135 ) $ 19 $ ( 135 ) $ 19 Nine Months Ended September 30, 2024 Foreign currency purchase contracts $ 81 $ - $ 20 $ 61 Futures contracts – copper and aluminum 105 384 260 229 $ 186 $ 384 $ 280 $ 290 Nine Months Ended September 30, 2023 Foreign currency purchase contracts $ 108 $ - $ 20 $ 88 Futures contracts – copper and aluminum 44 ( 81 ) 32 ( 69 ) $ 152 $ ( 81 ) $ 52 $ 19 The change in fair value reclassified or expected to be reclassified from accumulated other comprehensive loss to earnings is summarized below. All amounts are pre-tax. Location of Gain (Loss) Estimated to Three Months Ended September 30, Nine Months Ended September 30, of Operations 2024 2023 2024 2023 Foreign currency purchase contracts Depreciation and amortization $ 28 $ 6 $ 6 $ 20 $ 20 Futures contracts – copper and aluminum Costs of products sold $ 235 $ 7 $ ( 146 ) $ 267 $ 33

Fair Value

Fair Value	9 Months Ended
	Sep. 30, 2024
Fair Value Disclosures [Abstract]
Fair Value	Note 12 – Fair Value The Corporation’s financial assets and liabilities reported at fair value in the condensed consolidated balance sheets as of September 30, 2024 and December 31, 2023 were as follows: Quoted Prices Significant Significant Total As of September 30, 2024 Investments Other noncurrent assets $ 3,204 $ - $ - $ 3,204 As of December 31, 2023 Investments Other noncurrent assets $ 3,245 $ - $ - $ 3,245 The investments held as other noncurrent assets represent assets held in the “Rabbi” trust for the purpose of providing benefits under a non-qualified defined benefit pension plan. The fair value of the investments is based on quoted prices of the investments in active markets. The fair value of futures contracts is based on market quotations. The fair values of the debt and borrowings approximate their carrying values. Additionally, the fair values of trade receivables and accounts payable approximate their carrying values.

Net Sales and (Loss) Income Bef

Net Sales and (Loss) Income Before Income Taxes	9 Months Ended
	Sep. 30, 2024
Net Sales And Income Loss Before Income Taxes [Abstract]
Net Sales and (Loss) Income Before Income Taxes	Note 13 – Net Sales and (Loss) Income Before Income Taxes Net sales and (loss) income before income taxes by geographic area for the three and nine months ended September 30, 2024 and 2023 are outlined below. Approximately 95 % of foreign net sales for each of the periods is attributable to the FCEP segment. Three Months Ended September 30, Nine Months Ended September 30, Net Sales 2024 2023 2024 2023 United States $ 59,556 $ 63,118 $ 202,236 $ 182,247 Foreign 36,610 39,100 115,133 131,985 $ 96,166 $ 102,218 $ 317,369 $ 314,232 Three Months Ended September 30, Nine Months Ended September 30, (Loss) Income Before Income Taxes 2024 2023 2024 2023 United States (1) $ 837 $ 350 $ ( 181 ) $ ( 3,119 ) Foreign ( 1,655 ) 961 1,026 6,876 $ ( 818 ) $ 1,311 $ 845 $ 3,757 (1) Includes Corporate costs of $ 3,720 and $ 3,182 for the three months ended September 30, 2024 and 2023, respectively, and $ 10,688 and $ 9,959 for the nine months ended September 30, 2024 and 2023, respectively, which represent operating costs of the corporate office not allocated to the segments.

Stock-Based Compensation

Stock-Based Compensation	9 Months Ended
	Sep. 30, 2024
Share-Based Payment Arrangement [Abstract]
Stock-Based Compensation	Note 14 – Stock-Based Compensation The Ampco-Pittsburgh Corporation 2016 Omnibus Incentive Plan, as amended (the “Incentive Plan”), authorizes the issuance of up to 3,700,000 shares of the Corporation’s common stock for awards under the Incentive Plan. Awards under the Incentive Plan may include incentive stock options and non-qualified stock options, stock appreciation rights, restricted shares and restricted stock units, performance awards, other stock-based awards, or short-term cash incentive awards. If any award is canceled, terminates, expires, or lapses for any reason prior to the issuance of the shares, or if the shares are issued under the Incentive Plan and thereafter are forfeited to the Corporation, the shares subject to such awards and the forfeited shares will not count against the aggregate number of shares available under the Incentive Plan. Shares tendered or withheld to pay the option exercise price or tax withholding will continue to count against the aggregate number of shares of common stock available for grant under the Incentive Plan. Any shares repurchased by the Corporation with cash proceeds from the exercise of options will not be added back to the pool of shares available for grant under the Incentive Plan. The Incentive Plan may be administered by the Board of Directors or the Compensation Committee of the Board of Directors. The Compensation Committee has the authority to determine, within the limits of the express provisions of the Incentive Plan, the individuals to whom the awards will be granted and the nature, amount and terms of such awards. The Incentive Plan also provides for equity-based awards during any one year to non-employee members of the Board of Directors, based on the grant date fair value, not to exceed $ 200 . The limit does not apply to shares received by a non-employee director at his or her election in lieu of the director’s retainer for board service. The restricted stock awards vest on the one-year anniversary of the grant date. Stock-based compensation expense, including expense associated with equity-based awards granted to non-employee members of the Board of Directors, for the three and nine months ended September 30, 2024 equaled $ 372 and $ 1,106 , respectively, and for the three and nine months ended September 30, 2023, equaled $ 520 and $ 1,630 , respectively. The income tax benefit recognized in the condensed consolidated statements of operations was not significant due to the Corporation having a valuation allowance recorded against its deferred income tax assets for the majority of the jurisdictions where the expense was recognized.

Litigation

Litigation	9 Months Ended
	Sep. 30, 2024
Loss Contingency [Abstract]
Litigation	Note 15 – Litigation The Corporation and its subsidiaries are involved in various claims and lawsuits incidental to their businesses from time to time and are also subject to asbestos litigation. Asbestos Litigation Claims have been asserted alleging personal injury from exposure to asbestos-containing components historically used in some products manufactured by predecessors of Air & Liquid (the “Asbestos Liability”). Air & Liquid, and in some cases the Corporation, are defendants (among a number of defendants, often in excess of 50 defendants) in claims filed in various state and federal courts. Asbestos Claims The following table reflects approximate information about the number of claims for Asbestos Liability against Air & Liquid and the Corporation for the nine months ended September 30, 2024 and 2023 (number of claims not in thousands). The majority of the settlement and defense costs were reported and paid by insurers. Because claims are often filed and can be settled or dismissed in large groups, the amount and timing of settlements, as well as the number of open claims, can fluctuate significantly from period to period. Nine Months Ended September 30, 2024 2023 Total claims pending at the beginning of the period 6,310 6,259 New claims served 950 984 Claims dismissed ( 517 ) ( 647 ) Claims settled ( 419 ) ( 305 ) Total claims pending at the end of period (1) 6,324 6,291 Administrative closures (2) ( 3,117 ) ( 2,903 ) Total active claims at the end of the period 3,207 3,388 Gross settlement and defense costs paid in period (in 000’s) $ 18,610 $ 16,221 Average gross settlement and defense costs per claim resolved (in 000’s) (3) $ 19.88 $ 17.04 (1) Included as “total claims pending” are approximat ely 1,638 and 1,642 claims at September 30, 2024 and 2023, respectively, classified in various jurisdictions as “inactive” or transferred to a state or federal judicial panel on multi-district litigation. (2) For 2024, administrative closures include (i) mesothelioma claims filed five or more years ago; (ii) non-mesothelioma claims filed six or more years ago; (iii) claims previously classified in various jurisdictions as “inactive;” and (iv) claims transferred to a state or federal judicial panel on multi-district litigation. For 2023, administrative closures included the same except mesothelioma claims filed six or more years ago were considered administratively closed. Collectively, these claims are unlikely to result in any liability to the Corporation. (3) Claims resolved do not include claims administratively closed. Asbestos Insurance The Corporation and Air & Liquid are parties to a series of settlement agreements (“Settlement Agreements”) with insurance carriers that have coverage obligations for the Asbestos Liability (the “Settling Insurers”). During the second quarter of 2024, the Corporation and Air & Liquid entered into a settlement agreement with a previously unsettled insurance carrier resulting in reimbursement of prior years' costs of approximately $ 1,756 . Under the Settlement Agreements, the Settling Insurers accept financial responsibility, subject to the terms and conditions of the respective agreements, including overall coverage limits, for pending and future claims for the Asbestos Liability. The Settlement Agreements encompass the majority of insurance policies that provide coverage for claims for the Asbestos Liability. The Settlement Agreements acknowledge Howden North America, Inc. (“Howden”) is entitled to coverage under policies covering the Asbestos Liability for claims arising out of the historical products manufactured or distributed by Buffalo Forge, a former subsidiary of the Corporation (the “Products”), which was acquired by Howden. The Settlement Agreements do not provide for any prioritization on access to the applicable policies or any sub-limits of liability as to Howden or the Corporation and Air & Liquid and, accordingly, Howden may access the coverage afforded by the Settling Insurers for any covered claim arising out of the Products. In general, access by Howden to the coverage afforded by the Settling Insurers for the Products will erode coverage under the Settlement Agreements available to the Corporation and Air & Liquid for the Asbestos Liability. Asbestos Valuations The Corporation, with the assistance of a nationally recognized expert in the valuation of asbestos liabilities, reviews the Asbestos Liability and the underlying assumptions on a regular basis to determine whether any adjustment to the Asbestos Liability or the underlying assumptions are necessary. When warranted, the Asbestos Liability is adjusted to consider current trends and new information that becomes available. In conjunction with the regular updates of the estimated Asbestos Liability, the Corporation also develops an estimate of defense costs expected to be incurred with settling the Asbestos Liability and probable insurance recoveries for the Asbestos Liability and defense costs. In developing the estimate of probable defense costs, the Corporation considers several factors including, but not limited to, current and historical defense-to-indemnity cost ratios and expected defense-to-indemnity cost ratios. In developing the estimate of probable insurance recoveries, the Corporation considers the expert’s projection of settlement costs for the Asbestos Liability and management’s projection of associated defense costs. In addition, the Corporation consults with its outside legal counsel on insurance matters and a nationally recognized insurance consulting firm it retains to assist with certain policy allocation matters. The Corporation also considers a number of other factors including the Settlement Agreements in effect, policy exclusions, policy limits, policy provisions regarding coverage for defense costs, attachment points, gaps in the coverage, policy exhaustion, the nature of the underlying claims for the Asbestos Liability, estimated erosion of insurance limits on account of claims against Howden arising out of the Products, prior impairment of policies, insolvencies among certain of the insurance carriers, and creditworthiness of the remaining insurance carriers based on publicly available information. Based on these factors, the Corporation estimates the probable insurance recoveries for the Asbestos Liability and defense costs for the corresponding time frame of the Asbestos Liability. In the fourth quarter of 2023, in connection with its review of the underlying assumptions and primarily as a result of identified changes in claim data and availability of new information, the Corporation recorded an undiscounted increase to its estimated Asbestos Liability of approximately $ 112,640 . In addition, the Corporation revised its estimated defense-to-indemnity cost ratio from 65 % to 60 %, which reduced the Asbestos Liability by $ 4,162 . The following table summarizes activity relating to Asbestos Liability for the nine months ended September 30, 2024 and 2023. Nine Months Ended September 30, 2024 2023 Asbestos liability, beginning of the year $ 238,679 $ 153,575 Settlement and defense costs paid ( 18,610 ) ( 16,221 ) Asbestos liability, end of the period $ 220,069 $ 137,354 The increase in the asbestos-related insurance receivable associated with the increase in the estimated Asbestos Liability and a lower defense-to-indemnity ratio at December 31, 2023 approximated $ 67,591 . The following table summarizes activity relating to insurance recoveries for the nine months ended September 30, 2024 and 2023 , including the $ 1,756 reimbursement of prior years’ costs. Nine Months Ended September 30, 2024 2023 Insurance receivable – asbestos, beginning of the year $ 160,245 $ 105,434 Settlement and defense costs paid by insurance carriers ( 13,841 ) ( 9,041 ) Insurance receivable – asbestos, end of the period $ 146,404 $ 96,393 The insurance receivable does not assume any recovery from insolvent carriers. A substantial majority of the insurance recoveries deemed probable is from insurance companies rated A – (excellent) or better by A.M. Best Corporation. There can be no assurance, however, there will not be insolvencies among the relevant insurance carriers, or the assumed percentage recoveries for certain carriers will prove correct. During the third quarter of 2023, the Corporation received $ 191 of proceeds from an insolvent asbestos-related insurance carrier, which is recorded as a Credit for Asbestos Litigation in the accompanying condensed consolidated statement of operations. Asbestos Assumptions The amounts recorded for the Asbestos Liability and insurance receivable rely on assumptions based on currently known facts and strategy. The Corporation’s actual expenses or insurance recoveries could be significantly higher or lower than those recorded if assumptions used in the Corporation’s or the experts’ calculations vary significantly from actual results. Key variables in these assumptions include the forecast of the population likely to have been exposed to asbestos; the number of people likely to develop an asbestos-related disease; the estimated number of people likely to file an asbestos-related injury claim against the Corporation or its subsidiaries; an analysis of pending cases, by type of injury claimed and jurisdiction where the claim is filed; average settlement value of claims, by type of injury claimed and jurisdiction of filing; the number and nature of new claims to be filed each year; the average cost of disposing of each new claim; the average annual defense costs; compliance by relevant parties with the terms of the Settlement Agreements; and the solvency risk with respect to the relevant insurance carriers. Other factors that may affect the Asbestos Liability and ability to recover under the Corporation’s insurance policies include uncertainties surrounding the litigation process from jurisdiction to jurisdiction and from case to case, reforms that may be made by state and federal courts, and the passage of state or federal tort reform legislation. The Corporation intends to continue to evaluate the Asbestos Liability, related insurance receivable and the underlying assumptions on a regular basis to determine whether any adjustments to the estimates are required. Due to the uncertainties surrounding asbestos litigation and insurance recovery, these regular reviews may result in the Corporation adjusting its current reserves; however, the Corporation is currently unable to estimate such future adjustments. Adjustments, if any, to the Corporation’s estimate of the Asbestos Liability and/or insurance receivable could be material to the operating results for the period in which the adjustments to the liability, receivable or allowance are recorded and to the Corporation’s condensed consolidated financial position, results of operations and liquidity.

Environmental Matters

Environmental Matters	9 Months Ended
	Sep. 30, 2024
Environmental Remediation Obligations [Abstract]
Environmental Matters	Note 16 – Environmental Matters The Corporation is currently performing certain remedial actions in connection with the sale of real estate previously owned and periodically incurs costs to maintain compliance with environmental laws and regulations. Environmental exposures are difficult to assess and estimate for numerous reasons, including lack of reliable data, the multiplicity of possible solutions, the years of remedial and monitoring activity required, and identification of new sites. The undiscounted potential liability for remedial actions and environmental compliance measures approximated $ 100 at September 30, 2024 and December 31, 2023 .

Related Parties

Related Parties	9 Months Ended
	Sep. 30, 2024
Related Party Transactions [Abstract]
Related Parties	Note 17 – Related Parties ATR periodically has loans outstanding with its minority shareholder. Interest on borrowings accrues at the three -to- five-year loan interest rate set by the People’s Bank of China, which approximated 4.35 % for each of the three and nine months ended September 30, 2024 and 2023, respectively. For the nine months ended September 30, 2024 , ATR paid $ 2 (RMB 17 ) of interest. For the nine months ended September 30, 2023 , ATR paid $ 5 (RMB 35 ) of interest. No interest was outstanding as of September 30, 2024 or December 31, 2023. Loan activity for the nine months ended September 30, 2024 and 2023 was as follows: Nine Months Ended September 30, 2024 2024 2023 2023 USD RMB USD RMB Balance at beginning of the period $ 665 4,713 $ - - Borrowings - - 1,099 7,604 Repayments ( 664 ) ( 4,713 ) ( 1,096 ) ( 7,604 ) Foreign exchange ( 1 ) - ( 3 ) - Balance at end of the period $ - - $ - - ATR has sales to and purchases from ATR’s minority shareholder and its affiliates and sales to a shareholder of one of the Corporation’s other joint ventures in China and its affiliates. These sales and purchases, which were in the ordinary course of business, for the three and nine months ended September 30, 2024 and 2023 were as follows: Three Months Ended September 30, 2024 2024 2023 2023 USD RMB USD RMB Purchases from related parties $ 1,994 14,221 $ 1,913 13,752 Sales to related parties $ 4,094 29,156 $ 18 346 Nine Months Ended September 30, 2024 2024 2023 2023 USD RMB USD RMB Purchases from related parties $ 5,132 36,809 $ 5,236 36,885 Sales to related parties $ 12,267 87,980 $ 2,741 19,306 Balances outstanding with ATR’s minority shareholder including its affiliates and the other joint venture’s shareholder and its affiliates as of September 30, 2024 and December 31, 2023 were as follows: September 30, 2024 September 30, 2024 December 31, 2023 December 31, 2023 USD RMB USD RMB Accounts receivable from related parties $ 2,511 17,622 $ 190 1,350 Accounts payable to related parties $ 2,066 14,499 $ 401 2,841 Other current liabilities: Customer deposits $ - - $ 149 1,056 The manufacturing facilities of ATR are located on land leased by ATR from the other partner. The land lease commenced in 2007 , the date the joint venture was formed, and continues through 2054 , the expected end date of the joint venture, and includes variable lease payment provisions based on the land standard price prevailing in Taiyuan, China, where the joint venture is located. Rent paid by ATR to the other partner approximate d $ 34 (RMB 223 ) for each of the three months ended September 30, 2024 and 2023 and $ 95 (RMB 669 ) for each of the nine months ended September 30, 2024 and 2023, which is included in purchases from related parties. In addition, the Corporation had sales, in the ordinary course of business, to a wholly owned subsidiary of Crawford United Corporation which, along with other affiliated persons (collectively, the “Crawford Group”), was the beneficial owner of greater than 5 % of the Corporation’s stoc k at December 31, 2023 . Pursuant to Amendment No. 5 to Schedule 13D filed by the Crawford Group with the SEC on February 20, 2024 , the Crawford Group ceased to beneficially own greater than 5 % of the Corporation’s stock as of February 16, 2024 . The trade receiva ble with the Crawford Group was $ 722 at December 31, 2023 .

Business Segments

Business Segments	9 Months Ended
	Sep. 30, 2024
Segment Reporting [Abstract]
Business Segments	Note 18 – Business Segments The FCEP segment produces forged hardened steel rolls, cast rolls and forged engineered products (“FEP”). Forged hardened steel rolls are used primarily in cold rolling mills by producers of steel, aluminum and other metals. Cast rolls, which are produced in a variety of iron and steel qualities, are used mainly in hot and cold strip mills, medium/heavy section mills and plate mills. FEP principally are sold to customers in the steel distribution market, oil and gas industry and the aluminum and plastic extrusion industries. The segment has operations in the United States, England, Sweden, and Slovenia and equity interests in three joint venture companies in China. Collectively, the segment primarily competes with European, Asian and North American and South American companies in both domestic and foreign markets and distributes a significant portion of its products through sales offices located throughout the world. The ALP segment includes Aerofin, Buffalo Air Handling and Buffalo Pumps, all divisions of Air & Liquid. Aerofin produces custom-engineered finned tube heat exchange coils and related heat transfer products for a variety of industries including original equipment manufacturers, commercial, nuclear power generation and industrial manufacturing. Buffalo Air Handling produces large custom-designed air handling systems for institutional (e.g., hospital, university), pharmaceutical and general industrial building markets. Buffalo Pumps manufactures centrifugal pumps for the fossil-fueled power generation, marine defense and industrial refrigeration industries. The segment has operations in Virginia and New York with headquarters in Carnegie, Pennsylvania. The segment utilizes an independent group of sales offices located throughout the United States and Canada. Presented below are the net sales an d (loss) income bef ore income taxes for the Corporation’s two business segments and sales by product line. When disaggregating revenue, consideration is given to information regularly reviewed by the chief operating decision-maker to evaluate the financial performance of the operating segments and make resource allocation decisions. Three Months Ended September 30, Nine Months Ended September 30, 2024 2023 2024 2023 Net Sales: Forged and Cast Engineered Products Forged and cast mill rolls $ 63,833 $ 68,325 $ 209,876 $ 213,027 FEP 3,370 5,300 10,229 14,977 Forged and Cast Engineered Products 67,203 73,625 220,105 228,004 Air and Liquid Processing Air handling systems 8,853 9,357 35,406 27,453 Heat exchange coils 10,824 10,068 33,626 31,808 Centrifugal pumps 9,286 9,168 28,232 26,967 Air and Liquid Processing 28,963 28,593 97,264 86,228 Total Reportable Segments $ 96,166 $ 102,218 $ 317,369 $ 314,232 (Loss) income before income taxes: Forged and Cast Engineered Products (1) $ 2,456 $ 1,448 $ 9,393 $ 7,576 Air and Liquid Processing (2) 3,134 3,456 8,290 9,386 Total Reportable Segments 5,590 4,904 17,683 16,962 Other expense, including corporate costs ( 6,408 ) ( 3,593 ) ( 16,838 ) ( 13,205 ) Total $ ( 818 ) $ 1,311 $ 845 $ 3,757 (1) Income before income taxes for Forged and Cast Engineered Products for the nine months ended September 30, 2023 includes proceeds of approximately $ 1,874 for the reimbursement of past energy costs at one of the Corporation’s foreign operations by its local government. No future performance or conditions exist related to the reimbursement and, currently, no further reimbursements are expected. (2) Income before income taxes for Air and Liquid Processing for the three and nine months ended September 30, 2023 includes proceeds of approximately $ 191 from an insolvent insuranc e carrier.

Unaudited Condensed Consolida_2

Unaudited Condensed Consolidated Financial Statements (Policies)	9 Months Ended
	Sep. 30, 2024
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Unaudited Condensed Consolidated Financial Statements	The unaudited condensed consolidated balance sheet as of September 30, 2024 and the unaudited condensed consolidated statements of operations, comprehensive income (loss) and shareholders’ equity for the three and nine months ended September 30, 2024 and 2023, and cash flows for the nine months ended September 30, 2024 and 2023 have been prepared by the Corporation. In the opinion of management, all adjustments, consisting of only normal and recurring adjustments necessary to present fairly the financial position, results of operations and cash flows for the periods presented, have been made. The results of operations for the three and nine months ended September 30, 2024 are not necessarily indicative of the operating results expected for the full year. Certain information and footnote disclosures normally included in the annual financial statements prepared in accordance with accounting principles generally accepted in the United States of America (“GAAP”) have been condensed or omitted. These unaudited condensed consolidated financial statements should be read in conjunction with the Corporation’s latest Annual Report on Form 10-K.
Recently Issued Accounting Pronouncements	Recently Issued Accounting Pronouncements In November 2024, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update (“ASU”) 2024-03, Income Statement - Dissaggregation of Income Statement Expenses . The guidance requires tabular disclosure of certain expenses included in costs of products sold and selling and administrative expenses, such as purchases of inventory and employee compensation, and qualitative description of certain other costs. The guidance becomes effective for the Corporation’s annual period beginning January 1, 2027 and interim periods beginning January 1, 2028. The Corporation is currently evaluating the impact this new standard will have on its annual disclosures in its consolidated financial statements for the year ending December 31, 2027 and interim disclosures thereafter. It will not, however, impact the Corporation’s consolidated financial position, results of operations or cash flows. In November 2023, the FASB issued ASU 2023-07, Segment Reporting - Improvements to Reportable Segment Disclosures . The guidance requires disclosure of significant reportable segment expenses regularly provided to the chief operating decision-maker and included within each reported measure of a segment’s profit or loss. The guidance also requires disclosure of the title and position of the individual identified as the chief operating decision-maker and an explanation of how the chief operating decision-maker uses the reported measures of a segment’s profit or loss in assessing segment performance and deciding how to allocate resources. The guidance does not change how an entity identifies its operating segments, aggregates those operating segments, or applies the quantitative thresholds to determine its reportable segments. The guidance became effective for the Corporation’s annual period beginning January 1, 2024 and interim periods beginning January 1, 2025. The Corporation is currently evaluating the impact this new standard will have on its annual disclosures in its consolidated financial statements for the year ending December 31, 2024 and interim disclosures thereafter. It will not, however, impact the Corporation’s consolidated financial position, results of operations or cash flows. In December 2023, the FASB issued ASU 2023-09, Income Taxes - Improvements to Income Tax Disclosures . The guidance requires annual disclosure of specific categories of information within the effective tax rate reconciliation, and income taxes paid and income tax expense disaggregated by jurisdiction. The guidance becomes effective for the Corporation’s annual period beginning January 1, 2025. Early adoption is permitted. The Corporation is currently evaluating the impact this new standard will have on its annual disclosures. It will not, however, impact the Corporation’s consolidated financial position, results of operations or cash flows.

Inventories (Tables)

Inventories (Tables)	9 Months Ended
	Sep. 30, 2024
Inventory Disclosure [Abstract]
Schedule of Inventories	Inventories were comprised of the following: September 30, December 31, Raw materials $ 48,981 $ 51,794 Work-in-process 50,228 48,676 Finished goods 14,136 17,332 Supplies 7,511 6,892 Inventories $ 120,856 $ 124,694

Property, Plant and Equipment (

Property, Plant and Equipment (Tables)	9 Months Ended
	Sep. 30, 2024
Property, Plant and Equipment [Abstract]
Schedule of Property, Plant and Equipment	Property, plant and equipment were comprised of the following: September 30, December 31, Land and land improvements $ 9,038 $ 9,025 Buildings and leasehold improvements 71,711 71,063 Machinery and equipment 382,253 366,044 Construction-in-progress 3,580 11,514 Other 6,299 6,965 472,881 464,611 Accumulated depreciation and amortization ( 320,351 ) ( 305,879 ) Property, plant and equipment, net $ 152,530 $ 158,732

Intangible Assets (Tables)

Intangible Assets (Tables)	9 Months Ended
	Sep. 30, 2024
Goodwill and Intangible Assets Disclosure [Abstract]
Schedule of Intangible Assets	Intangible assets were comprised of the following: September 30, December 31, Customer relationships $ 5,395 $ 5,442 Developed technology 3,966 3,913 Trade name 2,220 2,219 11,581 11,574 Accumulated amortization ( 6,899 ) ( 6,627 ) Intangible assets, net $ 4,682 $ 4,947
Summary of Changes in Intangible Assets	Changes in intangible assets consisted of the following: Three Months Ended September 30, Nine Months Ended September 30, 2024 2023 2024 2023 Balance at beginning of the period $ 4,574 $ 4,859 $ 4,947 $ 5,194 Amortization of intangible assets ( 89 ) ( 87 ) ( 262 ) ( 266 ) Other, primarily impact from changes in foreign currency exchange rates 197 ( 45 ) ( 3 ) ( 201 ) Balance at end of the period $ 4,682 $ 4,727 $ 4,682 $ 4,727

Other Current Liabilities (Tabl

Other Current Liabilities (Tables)	9 Months Ended
	Sep. 30, 2024
Other Liabilities Disclosure [Abstract]
Schedule of Other Current Liabilities	Other current liabilities were comprised of the following: September 30, December 31, Customer-related liabilities $ 24,971 $ 19,915 Accrued utilities 1,885 1,880 Accrued sales commissions 1,800 1,850 Other 4,193 4,089 Other current liabilities $ 32,849 $ 27,734
Schedule of Changes in Liability for Product Warranty Claims	Changes in the liability for product warranty claims consisted of the following: Three Months Ended September 30, Nine Months Ended September 30, 2024 2023 2024 2023 Balance at beginning of the period $ 5,175 $ 5,639 $ 5,539 $ 5,193 Satisfaction of warranty claims ( 330 ) ( 304 ) ( 1,016 ) ( 1,280 ) Provision for warranty claims, net 440 62 884 1,439 Other, primarily impact from changes in foreign currency exchange rates 215 ( 110 ) 93 ( 65 ) Balance at end of the period $ 5,500 $ 5,287 $ 5,500 $ 5,287
Schedule of Changes in Customer Deposits	Changes in customer deposits consisted of the following: Three Months Ended September 30, Nine Months Ended September 30, 2024 2023 2024 2023 Balance at beginning of the period $ 18,807 $ 11,506 $ 13,078 $ 10,453 Satisfaction of performance obligations ( 6,156 ) ( 7,602 ) ( 13,541 ) ( 17,182 ) Receipt of additional deposits 9,759 5,266 22,892 15,886 Other, primarily impact from changes in foreign currency exchange rates 89 ( 22 ) 70 ( 9 ) Balance at end of the period 22,499 9,148 22,499 9,148 Deposits - Other noncurrent liabilities ( 4,213 ) - ( 4,213 ) - Deposits - Other current liabilities $ 18,286 $ 9,148 $ 18,286 $ 9,148

Debt (Tables)

Debt (Tables)	9 Months Ended
	Sep. 30, 2024
Debt Disclosure [Abstract]
Schedule of Outstanding Borrowings	Borrowings were comprised of the following: September 30, December 31, Revolving credit facility $ 57,224 $ 56,000 Sale and leaseback financing obligations 45,227 44,488 Equipment financing facility 17,291 16,719 Industrial Revenue Bonds 9,191 9,191 Finance lease liabilities 1,345 1,590 Minority shareholder loan - 665 Outstanding borrowings 130,278 128,653 Debt – current portion ( 14,268 ) ( 12,271 ) Long-term debt $ 116,010 $ 116,382

Pension and Other Postretirem_2

Pension and Other Postretirement Benefits (Tables)	9 Months Ended
	Sep. 30, 2024
Retirement Benefits [Abstract]
Contributions for Pension and Other Postretirement Benefits	Contributions to the Corporation’s employee benefit plans were as follows: Nine Months Ended September 30, 2024 2023 U.S. defined benefit pension plans $ 4,641 $ 207 U.S. defined benefit nonqualified pension plans (e.g. payments) $ 576 $ 576 Foreign defined benefit pension plans $ 327 $ 377 Other postretirement benefits (e.g., net payments) $ 273 $ 325 U.K. defined contribution pension plan $ 200 $ 175 U.S. defined contribution plan $ 2,457 $ 2,002
Net Periodic Pension and Other Postretirement Benefit Costs	Net periodic pension and other postretirement benefit costs included the following components: Three Months Ended September 30, Nine Months Ended September 30, U.S. Defined Benefit Pension Plans (a) 2024 2023 2024 2023 Service cost $ 2 $ 10 $ 22 $ 29 Interest cost 2,331 2,483 6,988 7,450 Expected return on plan assets ( 3,443 ) ( 3,596 ) ( 10,245 ) ( 10,788 ) Amortization of prior service cost - 2 1 5 Amortization of actuarial loss 45 30 136 91 Net benefit income $ ( 1,065 ) $ ( 1,071 ) $ ( 3,098 ) $ ( 3,213 ) a) Includes the nonqualified defined benefit pension plan. Three Months Ended September 30, Nine Months Ended September 30, Foreign Defined Benefit Pension Plans 2024 2023 2024 2023 Service cost $ 63 $ 87 $ 102 $ 225 Interest cost 467 468 1,375 1,391 Expected return on plan assets ( 490 ) ( 487 ) ( 1,443 ) ( 1,446 ) Amortization of prior service credit ( 72 ) ( 70 ) ( 213 ) ( 207 ) Amortization of actuarial loss 185 152 546 451 Net benefit expense $ 153 $ 150 $ 367 $ 414 Three Months Ended September 30, Nine Months Ended September 30, Other Postretirement Benefit Plans 2024 2023 2024 2023 Service cost $ 42 $ 43 $ 126 $ 128 Interest cost 90 98 271 293 Amortization of prior service credit ( 256 ) ( 256 ) ( 768 ) ( 768 ) Amortization of actuarial gain ( 79 ) ( 81 ) ( 236 ) ( 242 ) Net benefit income $ ( 203 ) $ ( 196 ) $ ( 607 ) $ ( 589 )

Accumulated Other Comprehensi_2

Accumulated Other Comprehensive Loss (Tables)	9 Months Ended
	Sep. 30, 2024
Equity [Abstract]
Net Change and Ending Balances for Various Components of Accumulated Other Comprehensive Loss	Net change and ending balances for the various components of accumulated other comprehensive loss as of and for the nine months ended September 30, 2024 and 2023 are summarized below. All amounts are net of tax where applicable. Foreign Unrecognized Cash Flow Total Less: Accumulated Other Balance at January 1, 2024 $ ( 23,161 ) $ ( 40,490 ) $ 186 $ ( 63,465 ) $ ( 476 ) $ ( 62,989 ) Net change 3,130 ( 1,002 ) 104 2,232 146 2,086 Balance at September 30, 2024 $ ( 20,031 ) $ ( 41,492 ) $ 290 $ ( 61,233 ) $ ( 330 ) $ ( 60,903 ) Balance at January 1, 2023 $ ( 26,170 ) $ ( 32,623 ) $ 152 $ ( 58,641 ) $ ( 229 ) $ ( 58,412 ) Net change ( 2,113 ) ( 683 ) ( 133 ) ( 2,929 ) ( 537 ) ( 2,392 ) Balance at September 30, 2023 $ ( 28,283 ) $ ( 33,306 ) $ 19 $ ( 61,570 ) $ ( 766 ) $ ( 60,804 )
Line Items Affected on Consolidated Statements of Operations for Components Reclassified from Accumulated Other Comprehensive Loss	The following summarizes the line items affected on the condensed consolidated statements of operations for components reclassified from accumulated other comprehensive loss. Amounts in parentheses represent credits to net (loss) income. Three Months Ended September 30, Nine Months Ended September 30, 2024 2023 2024 2023 Amortization of unrecognized employee benefit costs: Other loss – net $ ( 177 ) $ ( 223 ) $ ( 534 ) $ ( 670 ) Income tax effect - ( 12 ) - ( 58 ) Net of tax $ ( 177 ) $ ( 235 ) $ ( 534 ) $ ( 728 ) Settlements of cash flow hedges: Depreciation and amortization (foreign currency purchase contracts) $ ( 6 ) $ ( 6 ) $ ( 20 ) $ ( 20 ) Costs of products sold (excluding depreciation and ( 7 ) 146 ( 267 ) ( 33 ) Total before income tax ( 13 ) 140 ( 287 ) ( 53 ) Income tax effect - ( 5 ) 7 1 Net of tax $ ( 13 ) $ 135 $ ( 280 ) $ ( 52 )
Summary of Income Tax Effect Associated With Various Components of Other Comprehensive (Loss) Income	The income tax effect associated with the various components of other comprehensive income (loss) for the three and nine months ended September 30, 2024 and 2023 is summarized below. Amounts in parentheses represent credits to net (loss) income when reclassified to earnings. Certain amounts have no tax effect due to the Corporation having a valuation allowance recorded against the deferred income tax assets for the jurisdiction where the income or expense is recognized. Foreign currency translation adjustments exclude the effect of income taxes since earnings of non-U.S. subsidiaries are deemed to be reinvested for an indefinite period of time. Three Months Ended September 30, Nine Months Ended September 30, 2024 2023 2024 2023 Income tax effect associated with changes in: Unrecognized employee benefit costs $ - $ - $ - $ - Fair value of cash flow hedges $ ( 5 ) $ - $ ( 10 ) $ 3 Income tax effect associated with reclassification adjustments: Amortization of unrecognized employee benefit costs $ - $ ( 12 ) $ - $ ( 58 ) Settlement of cash flow hedges $ - $ ( 5 ) $ 7 $ 1

Derivative Instruments (Tables)

Derivative Instruments (Tables)	9 Months Ended
	Sep. 30, 2024
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Summary of Amount Recognized as and Reclassified from Accumulated Other Comprehensive Income (Loss)	The change in the fair value of the cash flow contracts is recorded as a component of accumulated other comprehensive loss. The balances as of September 30, 2024 and 2023 and the amounts recognized as and reclassified from accumulated other comprehensive loss for each of the periods are summarized below. Amounts are after tax where applicable. Certain amounts recognized as comprehensive income (loss) or reclassified from accumulated other comprehensive loss have no tax effect due to the Corporation having a valuation allowance recorded against the deferred income tax assets for the jurisdiction where the income or expense is recognized. Three Months Ended September 30, 2024 Beginning of Recognized Reclassified End of Foreign currency purchase contracts $ 67 $ - $ 6 $ 61 Futures contracts – copper and aluminum 62 174 7 229 $ 129 $ 174 $ 13 $ 290 Three Months Ended September 30, 2023 Foreign currency purchase contracts $ 94 $ - $ 6 $ 88 Futures contracts – copper and aluminum ( 229 ) 19 ( 141 ) ( 69 ) $ ( 135 ) $ 19 $ ( 135 ) $ 19 Nine Months Ended September 30, 2024 Foreign currency purchase contracts $ 81 $ - $ 20 $ 61 Futures contracts – copper and aluminum 105 384 260 229 $ 186 $ 384 $ 280 $ 290 Nine Months Ended September 30, 2023 Foreign currency purchase contracts $ 108 $ - $ 20 $ 88 Futures contracts – copper and aluminum 44 ( 81 ) 32 ( 69 ) $ 152 $ ( 81 ) $ 52 $ 19
Summary of Change in Fair Value Reclassified or Expected to be Reclassified from Accumulated Other Comprehensive Loss to Earnings	The change in fair value reclassified or expected to be reclassified from accumulated other comprehensive loss to earnings is summarized below. All amounts are pre-tax. Location of Gain (Loss) Estimated to Three Months Ended September 30, Nine Months Ended September 30, of Operations 2024 2023 2024 2023 Foreign currency purchase contracts Depreciation and amortization $ 28 $ 6 $ 6 $ 20 $ 20 Futures contracts – copper and aluminum Costs of products sold $ 235 $ 7 $ ( 146 ) $ 267 $ 33

Fair Value (Tables)

Fair Value (Tables)	9 Months Ended
	Sep. 30, 2024
Fair Value Disclosures [Abstract]
Fair Value of Financial Assets and Liabilities	The Corporation’s financial assets and liabilities reported at fair value in the condensed consolidated balance sheets as of September 30, 2024 and December 31, 2023 were as follows: Quoted Prices Significant Significant Total As of September 30, 2024 Investments Other noncurrent assets $ 3,204 $ - $ - $ 3,204 As of December 31, 2023 Investments Other noncurrent assets $ 3,245 $ - $ - $ 3,245

Net Sales and (Loss) Income B_2

Net Sales and (Loss) Income Before Income Taxes (Tables)	9 Months Ended
	Sep. 30, 2024
Net Sales And Income Loss Before Income Taxes [Abstract]
Net Sales and Income Before Income Taxes	Net sales and (loss) income before income taxes by geographic area for the three and nine months ended September 30, 2024 and 2023 are outlined below. Approximately 95 % of foreign net sales for each of the periods is attributable to the FCEP segment. Three Months Ended September 30, Nine Months Ended September 30, Net Sales 2024 2023 2024 2023 United States $ 59,556 $ 63,118 $ 202,236 $ 182,247 Foreign 36,610 39,100 115,133 131,985 $ 96,166 $ 102,218 $ 317,369 $ 314,232 Three Months Ended September 30, Nine Months Ended September 30, (Loss) Income Before Income Taxes 2024 2023 2024 2023 United States (1) $ 837 $ 350 $ ( 181 ) $ ( 3,119 ) Foreign ( 1,655 ) 961 1,026 6,876 $ ( 818 ) $ 1,311 $ 845 $ 3,757 (1) Includes Corporate costs of $ 3,720 and $ 3,182 for the three months ended September 30, 2024 and 2023, respectively, and $ 10,688 and $ 9,959 for the nine months ended September 30, 2024 and 2023, respectively, which represent operating costs of the corporate office not allocated to the segments.

Litigation (Tables)

Litigation (Tables)	9 Months Ended
	Sep. 30, 2024
Loss Contingency [Abstract]
Schedule of Loss Contingencies by Contingency	The following table reflects approximate information about the number of claims for Asbestos Liability against Air & Liquid and the Corporation for the nine months ended September 30, 2024 and 2023 (number of claims not in thousands). The majority of the settlement and defense costs were reported and paid by insurers. Because claims are often filed and can be settled or dismissed in large groups, the amount and timing of settlements, as well as the number of open claims, can fluctuate significantly from period to period. Nine Months Ended September 30, 2024 2023 Total claims pending at the beginning of the period 6,310 6,259 New claims served 950 984 Claims dismissed ( 517 ) ( 647 ) Claims settled ( 419 ) ( 305 ) Total claims pending at the end of period (1) 6,324 6,291 Administrative closures (2) ( 3,117 ) ( 2,903 ) Total active claims at the end of the period 3,207 3,388 Gross settlement and defense costs paid in period (in 000’s) $ 18,610 $ 16,221 Average gross settlement and defense costs per claim resolved (in 000’s) (3) $ 19.88 $ 17.04 (1) Included as “total claims pending” are approximat ely 1,638 and 1,642 claims at September 30, 2024 and 2023, respectively, classified in various jurisdictions as “inactive” or transferred to a state or federal judicial panel on multi-district litigation. (2) For 2024, administrative closures include (i) mesothelioma claims filed five or more years ago; (ii) non-mesothelioma claims filed six or more years ago; (iii) claims previously classified in various jurisdictions as “inactive;” and (iv) claims transferred to a state or federal judicial panel on multi-district litigation. For 2023, administrative closures included the same except mesothelioma claims filed six or more years ago were considered administratively closed. Collectively, these claims are unlikely to result in any liability to the Corporation. (3) Claims resolved do not include claims administratively closed.
Summary of Activity Relating to Asbestos Liability	The following table summarizes activity relating to Asbestos Liability for the nine months ended September 30, 2024 and 2023. Nine Months Ended September 30, 2024 2023 Asbestos liability, beginning of the year $ 238,679 $ 153,575 Settlement and defense costs paid ( 18,610 ) ( 16,221 ) Asbestos liability, end of the period $ 220,069 $ 137,354
Summary of Activity in Asbestos Insurance Recoveries	The increase in the asbestos-related insurance receivable associated with the increase in the estimated Asbestos Liability and a lower defense-to-indemnity ratio at December 31, 2023 approximated $ 67,591 . The following table summarizes activity relating to insurance recoveries for the nine months ended September 30, 2024 and 2023 , including the $ 1,756 reimbursement of prior years’ costs. Nine Months Ended September 30, 2024 2023 Insurance receivable – asbestos, beginning of the year $ 160,245 $ 105,434 Settlement and defense costs paid by insurance carriers ( 13,841 ) ( 9,041 ) Insurance receivable – asbestos, end of the period $ 146,404 $ 96,393

Related Parties (Tables)

Related Parties (Tables)	9 Months Ended
	Sep. 30, 2024
Related Party Transactions [Abstract]
Schedule of Related Party Transactions	Loan activity for the nine months ended September 30, 2024 and 2023 was as follows: Nine Months Ended September 30, 2024 2024 2023 2023 USD RMB USD RMB Balance at beginning of the period $ 665 4,713 $ - - Borrowings - - 1,099 7,604 Repayments ( 664 ) ( 4,713 ) ( 1,096 ) ( 7,604 ) Foreign exchange ( 1 ) - ( 3 ) - Balance at end of the period $ - - $ - - ATR has sales to and purchases from ATR’s minority shareholder and its affiliates and sales to a shareholder of one of the Corporation’s other joint ventures in China and its affiliates. These sales and purchases, which were in the ordinary course of business, for the three and nine months ended September 30, 2024 and 2023 were as follows: Three Months Ended September 30, 2024 2024 2023 2023 USD RMB USD RMB Purchases from related parties $ 1,994 14,221 $ 1,913 13,752 Sales to related parties $ 4,094 29,156 $ 18 346 Nine Months Ended September 30, 2024 2024 2023 2023 USD RMB USD RMB Purchases from related parties $ 5,132 36,809 $ 5,236 36,885 Sales to related parties $ 12,267 87,980 $ 2,741 19,306 Balances outstanding with ATR’s minority shareholder including its affiliates and the other joint venture’s shareholder and its affiliates as of September 30, 2024 and December 31, 2023 were as follows: September 30, 2024 September 30, 2024 December 31, 2023 December 31, 2023 USD RMB USD RMB Accounts receivable from related parties $ 2,511 17,622 $ 190 1,350 Accounts payable to related parties $ 2,066 14,499 $ 401 2,841 Other current liabilities: Customer deposits $ - - $ 149 1,056

Business Segments (Tables)

Business Segments (Tables)	9 Months Ended
	Sep. 30, 2024
Segment Reporting [Abstract]
Business Segment Net Sales and (Loss) Income before Income Taxes	Presented below are the net sales an d (loss) income bef ore income taxes for the Corporation’s two business segments and sales by product line. When disaggregating revenue, consideration is given to information regularly reviewed by the chief operating decision-maker to evaluate the financial performance of the operating segments and make resource allocation decisions. Three Months Ended September 30, Nine Months Ended September 30, 2024 2023 2024 2023 Net Sales: Forged and Cast Engineered Products Forged and cast mill rolls $ 63,833 $ 68,325 $ 209,876 $ 213,027 FEP 3,370 5,300 10,229 14,977 Forged and Cast Engineered Products 67,203 73,625 220,105 228,004 Air and Liquid Processing Air handling systems 8,853 9,357 35,406 27,453 Heat exchange coils 10,824 10,068 33,626 31,808 Centrifugal pumps 9,286 9,168 28,232 26,967 Air and Liquid Processing 28,963 28,593 97,264 86,228 Total Reportable Segments $ 96,166 $ 102,218 $ 317,369 $ 314,232 (Loss) income before income taxes: Forged and Cast Engineered Products (1) $ 2,456 $ 1,448 $ 9,393 $ 7,576 Air and Liquid Processing (2) 3,134 3,456 8,290 9,386 Total Reportable Segments 5,590 4,904 17,683 16,962 Other expense, including corporate costs ( 6,408 ) ( 3,593 ) ( 16,838 ) ( 13,205 ) Total $ ( 818 ) $ 1,311 $ 845 $ 3,757 (1) Income before income taxes for Forged and Cast Engineered Products for the nine months ended September 30, 2023 includes proceeds of approximately $ 1,874 for the reimbursement of past energy costs at one of the Corporation’s foreign operations by its local government. No future performance or conditions exist related to the reimbursement and, currently, no further reimbursements are expected. (2) Income before income taxes for Air and Liquid Processing for the three and nine months ended September 30, 2023 includes proceeds of approximately $ 191 from an insolvent insuranc e carrier.

Unaudited Condensed Consolida_3

Unaudited Condensed Consolidated Financial Statements - Additional Information (Detail)	9 Months Ended
	Sep. 30, 2024 Segment
Unaudited Condensed Consolidated Financial Statements [Line Items]
Number of reportable business segments	2

Inventories - Schedule of Inven

Inventories - Schedule of Inventories (Detail) - USD ($) $ in Thousands	Sep. 30, 2024	Dec. 31, 2023
Inventory Disclosure [Abstract]
Raw materials	$ 48,981	$ 51,794
Work-in-process	50,228	48,676
Finished goods	14,136	17,332
Supplies	7,511	6,892
Inventories	$ 120,856	$ 124,694

Property, Plant and Equipment -

Property, Plant and Equipment - Schedule of Property, Plant and Equipment (Detail) - USD ($) $ in Thousands	Sep. 30, 2024	Dec. 31, 2023
Property Plant And Equipment [Line Items]
Property, plant and equipment, Gross	$ 472,881	$ 464,611
Accumulated depreciation and amortization	(320,351)	(305,879)
Property, plant and equipment, net	152,530	158,732
Land and Land Improvements [Member]
Property Plant And Equipment [Line Items]
Property, plant and equipment, Gross	9,038	9,025
Buildings and Leasehold Improvements [Member]
Property Plant And Equipment [Line Items]
Property, plant and equipment, Gross	71,711	71,063
Machinery and Equipment [Member]
Property Plant And Equipment [Line Items]
Property, plant and equipment, Gross	382,253	366,044
Construction-in-Progress [Member]
Property Plant And Equipment [Line Items]
Property, plant and equipment, Gross	3,580	11,514
Other [Member]
Property Plant And Equipment [Line Items]
Property, plant and equipment, Gross	$ 6,299	$ 6,965

Property, Plant and Equipment_2

Property, Plant and Equipment - Additional Information (Detail) £ in Thousands	1 Months Ended		3 Months Ended		9 Months Ended		12 Months Ended
	Jun. 30, 2023 USD ($)	Aug. 31, 2022 USD ($)	Sep. 30, 2024 USD ($)	Sep. 30, 2023 USD ($)	Sep. 30, 2024 USD ($)	Sep. 30, 2023 USD ($)	Dec. 31, 2023 USD ($)	Dec. 31, 2021 USD ($)	Sep. 30, 2024 GBP (£)
Property Plant And Equipment [Line Items]
Finance lease assets gross value			$ 3,539,000		$ 3,539,000		$ 4,223,000
Finance lease, lease related accumulated amortization			1,876,000		1,876,000		$ 1,959,000
Depreciation expense			$ 4,497,000	$ 4,295,000	$ 13,692,000	$ 12,844,000
Remaining lease term							20 years
Finance Lease, Right-of-Use Asset, Statement of Financial Position [Extensible Enumeration]			Long-Term Debt and Lease Obligation, Current		Long-Term Debt and Lease Obligation, Current		Long-Term Debt and Lease Obligation, Current		Long-Term Debt and Lease Obligation, Current
Estimated cost on upgrading existing equipment								$ 26,000,000
Interest capitalized on strategic capital projects			$ 0	425,000	$ 251,000	1,027,000
Depreciation on assets under finance leases			80,000	$ 115,000	242,000	$ 252,000
Capital Expenditures [Member]
Property Plant And Equipment [Line Items]
Proceeds from disbursement agreement	$ 2,500,000						$ 2,500,000
Estimated cost on upgrading existing equipment		$ 2,500,000
Union Electric Steel UK Limited [Member]
Property Plant And Equipment [Line Items]
Land and buildings held as collateral			$ 2,841,000		2,841,000				£ 2,122
UES Domestic [Member] | Construction-in-Process, Machinery and Equipment or Buildings [Member]
Property Plant And Equipment [Line Items]
Machinery and equipment purchased					$ 24,239,000

Intangible Assets - Schedule of

Intangible Assets - Schedule of Intangible Assets (Detail) - USD ($) $ in Thousands	Sep. 30, 2024	Jun. 30, 2024	Dec. 31, 2023	Sep. 30, 2023	Jun. 30, 2023	Dec. 31, 2022
Finite and Indefinite Lived Intangible Assets [Line Items]
Intangible assets, Trade name	$ 2,220		$ 2,219
Intangible assets, gross	11,581		11,574
Accumulated amortization	(6,899)		(6,627)
Intangible assets, net	4,682	$ 4,574	4,947	$ 4,727	$ 4,859	$ 5,194
Customer Relationships [Member]
Finite and Indefinite Lived Intangible Assets [Line Items]
Intangible assets, gross	5,395		5,442
Developed Technology [Member]
Finite and Indefinite Lived Intangible Assets [Line Items]
Intangible assets, gross	$ 3,966		$ 3,913

Intangible Assets - Summary of

Intangible Assets - Summary of Changes in Intangible Assets (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Intangible Assets, Net (Excluding Goodwill) [Abstract]
Balance at beginning of the period	$ 4,574	$ 4,859	$ 4,947	$ 5,194
Amortization of intangible assets	(89)	(87)	(262)	(266)
Other, primarily impact from changes in foreign currency exchange rates	197	(45)	(3)	(201)
Balance at end of the period	$ 4,682	$ 4,727	$ 4,682	$ 4,727

Other Current Liabilities - Sch

Other Current Liabilities - Schedule of Other Current Liabilities (Detail) - USD ($) $ in Thousands	Sep. 30, 2024	Dec. 31, 2023
Other Liabilities Disclosure [Abstract]
Customer-related liabilities	$ 24,971	$ 19,915
Accrued utilities	1,885	1,880
Accrued sales commissions	1,800	1,850
Other	4,193	4,089
Other current liabilities	$ 32,849	$ 27,734

Other Current Liabilities - S_2

Other Current Liabilities - Schedule of Changes in Liability for Product Warranty Claims (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Other Liabilities Disclosure [Abstract]
Balance at beginning of the period	$ 5,175	$ 5,639	$ 5,539	$ 5,193
Satisfaction of warranty claims	(330)	(304)	(1,016)	(1,280)
Provision for warranty claims, net	440	62	884	1,439
Other, primarily impact from changes in foreign currency exchange rates	215	(110)	93	(65)
Balance at end of the period	$ 5,500	$ 5,287	$ 5,500	$ 5,287

Other Current Liabilities - Add

Other Current Liabilities - Additional Information (Detail)	9 Months Ended
	Sep. 30, 2024
Noncurrent Liability [Member]
Other Liabilities Disclosure [Line Items]
Performance obligation related to customer deposits expected satisfaction period	1 year
Maximum [Member]
Other Liabilities Disclosure [Line Items]
Performance obligation related to customer deposits expected satisfaction period	1 year

Other Current Liabilities - S_3

Other Current Liabilities - Schedule of Change in Customer Deposits (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Contract with Customer, Liability [Abstract]
Balance at beginning of the period	$ 18,807	$ 11,506	$ 13,078	$ 10,453
Satisfaction of performance obligations	(6,156)	(7,602)	(13,541)	(17,182)
Receipt of additional deposits	9,759	5,266	22,892	15,886
Other, primarily impact from changes in foreign currency exchange rates	89	(22)	70	(9)
Balance at end of the period	22,499	9,148	22,499	9,148
Deposits - Other noncurrent liabilities	(4,213)		(4,213)
Deposits - Other current liabilities	$ 18,286	$ 9,148	$ 18,286	$ 9,148

Debt - Schedule of Outstanding

Debt - Schedule of Outstanding Borrowings (Detail) - USD ($) $ in Thousands	Sep. 30, 2024	Dec. 31, 2023
Debt Instrument [Line Items]
Finance lease liabilities	$ 1,345	$ 1,590
Finance Lease, Liability, Statement of Financial Position [Extensible Enumeration]	Debt – current portion	Debt – current portion
Outstanding borrowings	$ 130,278	$ 128,653
Debt – current portion	(14,268)	(12,271)
Long-term debt	116,010	116,382
Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Long term debt	57,224	56,000
Sale and Leaseback Financing Obligations [Member]
Debt Instrument [Line Items]
Long term debt	45,227	44,488
Equipment Financing Facility [Member]
Debt Instrument [Line Items]
Long term debt	17,291	16,719
Minority Shareholder Loan [Member]
Debt Instrument [Line Items]
Long term debt		665
Industrial Revenue Bonds [Member]
Debt Instrument [Line Items]
Long term debt	$ 9,191	$ 9,191

Debt - Additional Information (

Debt - Additional Information (Detail) ¥ in Thousands			1 Months Ended		3 Months Ended		9 Months Ended				12 Months Ended
	Oct. 01, 2024 USD ($)	Sep. 29, 2022 USD ($)	Jun. 30, 2023 USD ($)	Aug. 31, 2022 USD ($)	Sep. 30, 2024 USD ($)	Sep. 30, 2023	Sep. 30, 2024 USD ($) Bond	Sep. 30, 2024 CNY (¥) Bond	Sep. 30, 2023 USD ($)	Sep. 30, 2023 CNY (¥)	Dec. 31, 2023 USD ($)	Dec. 31, 2021 USD ($)	Jul. 01, 2023	Oct. 14, 2022	Jun. 29, 2021 USD ($)
Line Of Credit Facility [Line Items]
Swing loans					$ 2,224,000		$ 2,224,000				$ 0
Lessee lease term											20 years
Estimated cost on upgrading existing equipment												$ 26,000,000
Life of underlying asset							15 years	15 years
Subsequent Event [Member]
Line Of Credit Facility [Line Items]
Incremental percentage on annual lease payment	2.04%
ATR [Member] | Akers AB [Member]
Line Of Credit Facility [Line Items]
Ownership interest percentage					59.88%		59.88%
Industrial Revenue Bonds ("IRB") [Member]
Line Of Credit Facility [Line Items]
Long term debt					$ 9,191,000		$ 9,191,000				$ 9,191,000
Number of industrial revenue bonds | Bond							2	2
Minority Shareholder Loan [Member]
Line Of Credit Facility [Line Items]
Debt instrument, borrowed									$ 1,099,000	¥ 7,604
Debt instrument, repaid							$ 664,000	¥ 4,713	$ 1,096,000	¥ 7,604
Capital Additions [Member]
Line Of Credit Facility [Line Items]
Estimated cost on upgrading existing equipment				$ 2,500,000
Proceeds from disbursement agreement			$ 2,500,000								2,500,000
Annual rent adjustment to repay restated lease				$ 2,500,000
Maximum [Member]
Line Of Credit Facility [Line Items]
Incremental percentage on annual lease payment							2.04%	2.04%
Change in consumer price index ratio							1.25	1.25
Revolving Credit Facility [Member]
Line Of Credit Facility [Line Items]
Agreement borrowing capacity															$ 130,000,000
Allowance for new equipment financing															20,000,000
Maturity date							Jun. 29, 2026	Jun. 29, 2026
Commitment fee payable percentage							0.25%	0.25%
Average interest rate					8.26%	8.32%	8.24%	8.24%	7.97%	7.97%
Long term debt					$ 57,224,000		$ 57,224,000				56,000,000
Line of credit, remaining borrowing capacity					$ 20,507,000		$ 20,507,000
Revolving Credit Facility [Member] | Minimum [Member]
Line Of Credit Facility [Line Items]
Fixed charge coverage ratio					1.05		1.05
Revolving Credit Facility [Member] | SOFR [Member]
Line Of Credit Facility [Line Items]
Debt instrument description of interest rate							SOFR, as adjusted, plus an applicable margin ranging between 2.00% to 2.50% based on the quarterly average excess availability	SOFR, as adjusted, plus an applicable margin ranging between 2.00% to 2.50% based on the quarterly average excess availability
Revolving Credit Facility [Member] | SOFR [Member] | Minimum [Member]
Line Of Credit Facility [Line Items]
Debt instrument basis spread							2%	2%
Revolving Credit Facility [Member] | SOFR [Member] | Maximum [Member]
Line Of Credit Facility [Line Items]
Debt instrument basis spread							2.50%	2.50%
Revolving Credit Facility [Member] | Base Rate [Member]
Line Of Credit Facility [Line Items]
Debt instrument description of interest rate							the alternate base rate plus an applicable margin ranging between 1.00% to 1.50%	the alternate base rate plus an applicable margin ranging between 1.00% to 1.50%
Revolving Credit Facility [Member] | Base Rate [Member] | Minimum [Member]
Line Of Credit Facility [Line Items]
Debt instrument basis spread							1%	1%
Revolving Credit Facility [Member] | Base Rate [Member] | Maximum [Member]
Line Of Credit Facility [Line Items]
Debt instrument basis spread							1.50%	1.50%
Revolving Credit Facility [Member] | Senior Secured Asset-Based Revolving Credit Facility [Member]
Line Of Credit Facility [Line Items]
Agreement borrowing capacity															100,000,000
Revolving Credit Facility [Member] | Letter of Credit [Member]
Line Of Credit Facility [Line Items]
Agreement borrowing capacity															40,000,000
Revolving Credit Facility [Member] | European Credit Facility [Member]
Line Of Credit Facility [Line Items]
Agreement borrowing capacity															30,000,000
Borrowings					$ 0		$ 0				0
Revolving Credit Facility [Member] | Swedish Credit Facility [Member]
Line Of Credit Facility [Line Items]
Agreement borrowing capacity															$ 7,500,000
Sale and Leaseback Financing Obligations [Member]
Line Of Credit Facility [Line Items]
Long term debt					45,227,000		45,227,000				44,488,000
Taxable Industrial Revenue Bond [Member] | Industrial Revenue Bonds ("IRB") [Member]
Line Of Credit Facility [Line Items]
Long term debt					$ 7,116,000		$ 7,116,000
Interest at a floating rate on IRB maturing in 2027/2029					5.40%	5.39%	5.40%	5.40%	5.04%	5.04%
Tax Exempt Industrial Revenue Bond Two [Member] | Industrial Revenue Bonds ("IRB") [Member]
Line Of Credit Facility [Line Items]
Long term debt					$ 2,075,000		$ 2,075,000
Interest at a floating rate on IRB maturing in 2027/2029					3.62%	4.19%	3.80%	3.80%	3.63%	3.63%
Equipment Financing Facility [Member]
Line Of Credit Facility [Line Items]
Agreement borrowing capacity		$ 20,000,000
Long term debt					$ 17,291,000		$ 17,291,000				16,719,000
Effective interest rate													10.25%
Payments of principal and interest							$ 293,000
Debt instrument, maturity date, description							2031	2031
Debt Instrument, Term		84 months
Equipment Financing Facility [Member] | Term Loan [Member]
Line Of Credit Facility [Line Items]
Long term debt											15,819,000
Effective interest rate		8%	8%
Equipment Financing Facility [Member] | Term Notes [Member]
Line Of Credit Facility [Line Items]
Long term debt											$ 900,000
Effective interest rate during period					8.69%		8.60%	8.60%
Equipment Financing Facility [Member] | Term Notes [Member] | Minimum [Member]
Line Of Credit Facility [Line Items]
Percentage of converted fixed interest rate							8.40%	8.40%
Equipment Financing Facility [Member] | Term Notes [Member] | Maximum [Member]
Line Of Credit Facility [Line Items]
Percentage of converted fixed interest rate							9.22%	9.22%
Disbursement Agreement [Member]
Line Of Credit Facility [Line Items]
Lessee lease term														20 years
Lessee, operating lease, option to extend							however, UES may extend the lease for the Properties for four successive periods of five years each. If fully extended, the Restated Lease would expire in August 2062	however, UES may extend the lease for the Properties for four successive periods of five years each. If fully extended, the Restated Lease would expire in August 2062
Lessee, operating term period														5 years
Extended lease expiration date														2062-08
Lease repurchase percentage on lessor investment for properties														115%
Effective interest rate during period					8.25%	8.89%	8.24%	8.24%	8.36%	8.36%
Rental properties					$ 3,645,000		$ 3,645,000
Disbursement Agreement [Member] | Subsequent Event [Member]
Line Of Credit Facility [Line Items]
Rental properties	$ 3,719,000

Pension and Other Postretirem_3

Pension and Other Postretirement Benefits - Contributions for Pension and Other Postretirement Benefits (Detail) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023
Other Postretirement Benefit Plans [Member]
Pension Plans Postretirement And Other Employee Benefits [Line Items]
Contribution	$ 273	$ 325
U.S. [Member] | Defined Benefit Pension Plan [Member]
Pension Plans Postretirement And Other Employee Benefits [Line Items]
Contribution	4,641	207
U.S. [Member] | Defined Contribution Plan [Member]
Pension Plans Postretirement And Other Employee Benefits [Line Items]
Contribution	2,457	2,002
U.S. [Member] | Nonqualified [Member] | Defined Benefit Pension Plan [Member]
Pension Plans Postretirement And Other Employee Benefits [Line Items]
Contribution	576	576
Foreign Defined Benefits Pension Plans [Member] | Defined Benefit Pension Plan [Member]
Pension Plans Postretirement And Other Employee Benefits [Line Items]
Contribution	327	377
U.K. [Member] | Defined Contribution Plan [Member]
Pension Plans Postretirement And Other Employee Benefits [Line Items]
Contribution	$ 200	$ 175

Pension and Other Postretirem_4

Pension and Other Postretirement Benefits - Net Periodic Pension and Other Postretirement Benefit Costs (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Other Postretirement Benefit Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 42	$ 43	$ 126	$ 128
Interest cost	$ 90	$ 98	$ 271	$ 293
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Interest Cost, Statement of Income or Comprehensive Income [Extensible Enumeration]	Other Nonoperating Income (Expense)	Other Nonoperating Income (Expense)	Other Nonoperating Income (Expense)	Other Nonoperating Income (Expense)
Amortization of prior service cost (credit)	$ (256)	$ (256)	$ (768)	$ (768)
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) Excluding Service Cost, Statement of Income or Comprehensive Income [Extensible Enumeration]	Other Nonoperating Income (Expense)	Other Nonoperating Income (Expense)	Other Nonoperating Income (Expense)	Other Nonoperating Income (Expense)
Amortization of actuarial (gain) loss	$ (79)	$ (81)	$ (236)	$ (242)
Defined Benefit Plan, Net Periodic Benefit (Cost) Credit, Amortization of Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration]	Other Nonoperating Income (Expense)	Other Nonoperating Income (Expense)	Other Nonoperating Income (Expense)	Other Nonoperating Income (Expense)
Net benefit expense (income)	$ (203)	$ (196)	$ (607)	$ (589)
U.S. [Member] | Defined Benefit Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	2	10	22	29
Interest cost	$ 2,331	$ 2,483	$ 6,988	$ 7,450
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Interest Cost, Statement of Income or Comprehensive Income [Extensible Enumeration]	Other Nonoperating Income (Expense)	Other Nonoperating Income (Expense)	Other Nonoperating Income (Expense)	Other Nonoperating Income (Expense)
Expected return on plan assets	$ (3,443)	$ (3,596)	$ (10,245)	$ (10,788)
Amortization of prior service cost (credit)		$ 2	$ 1	$ 5
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) Excluding Service Cost, Statement of Income or Comprehensive Income [Extensible Enumeration]	Other Nonoperating Income (Expense)	Other Nonoperating Income (Expense)	Other Nonoperating Income (Expense)	Other Nonoperating Income (Expense)
Amortization of actuarial (gain) loss	$ 45	$ 30	$ 136	$ 91
Defined Benefit Plan, Net Periodic Benefit (Cost) Credit, Amortization of Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration]	Other Nonoperating Income (Expense)	Other Nonoperating Income (Expense)	Other Nonoperating Income (Expense)	Other Nonoperating Income (Expense)
Net benefit expense (income)	$ (1,065)	$ (1,071)	$ (3,098)	$ (3,213)
Foreign Defined Benefits Pension Plans [Member] | Defined Benefit Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	63	87	102	225
Interest cost	$ 467	$ 468	$ 1,375	$ 1,391
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Interest Cost, Statement of Income or Comprehensive Income [Extensible Enumeration]	Other Nonoperating Income (Expense)	Other Nonoperating Income (Expense)	Other Nonoperating Income (Expense)	Other Nonoperating Income (Expense)
Expected return on plan assets	$ (490)	$ (487)	$ (1,443)	$ (1,446)
Amortization of prior service cost (credit)	$ (72)	$ (70)	$ (213)	$ (207)
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) Excluding Service Cost, Statement of Income or Comprehensive Income [Extensible Enumeration]	Other Nonoperating Income (Expense)	Other Nonoperating Income (Expense)	Other Nonoperating Income (Expense)	Other Nonoperating Income (Expense)
Amortization of actuarial (gain) loss	$ 185	$ 152	$ 546	$ 451
Defined Benefit Plan, Net Periodic Benefit (Cost) Credit, Amortization of Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration]	Other Nonoperating Income (Expense)	Other Nonoperating Income (Expense)	Other Nonoperating Income (Expense)	Other Nonoperating Income (Expense)
Net benefit expense (income)	$ 153	$ 150	$ 367	$ 414

Commitments and Contingent Li_2

Commitments and Contingent Liabilities - Additional Information (Detail) - 9 months ended Sep. 30, 2024 kr in Thousands, $ in Thousands	USD ($)	SEK (kr)
Commitments And Contingent Liabilities [Line Items]
Outstanding standby and commercial letters of credit	$ 15,909
Surety bonds issued to guarantee obligations	3,351	kr 33,900
Capital Expenditures [Member]
Commitments And Contingent Liabilities [Line Items]
Purchase commitments	$ 6,000

Equity Rights Offering - Additi

Equity Rights Offering - Additional Information (Detail) - USD ($)	1 Months Ended	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023	Dec. 31, 2023
Class Of Warrant Or Right [Line Items]
Proceeds from issuance of common stock and warrants		$ 0	$ 0	$ 0	$ 0
Common Stock [Member]
Class Of Warrant Or Right [Line Items]
Common stock issued	5,507,889
Series A Warrants [Member]
Class Of Warrant Or Right [Line Items]
Warrants to purchase common stock	12,339,256
Exercise price per warrants	$ 2.5668
Warrants outstanding		10,941,869		10,941,869		10,941,869
Series A Warrants [Member] | Common Stock [Member]
Class Of Warrant Or Right [Line Items]
Number of shares can purchase for each warrant	0.4464
Exercise price per share of warrants	$ 5.75
Class of warrant or right, expiration date	Aug. 01, 2025

Accumulated Other Comprehensi_3

Accumulated Other Comprehensive Loss - Net Change and Ending Balances for Various Components of Accumulated Other Comprehensive Loss (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	$ 69,459	$ 115,580	$ 71,571	$ 112,649
Net change	5,299	(3,050)	2,232	(2,929)
Ending Balance	73,676	114,285	73,676	114,285
Foreign Currency Translation [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance			(23,161)	(26,170)
Net change			3,130	(2,113)
Ending Balance	(20,031)	(28,283)	(20,031)	(28,283)
Unrecognized Employee Benefit Costs [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance			(40,490)	(32,623)
Net change			(1,002)	(683)
Ending Balance	(41,492)	(33,306)	(41,492)	(33,306)
Cash Flow Hedges [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance			186	152
Net change			104	(133)
Ending Balance	290	19	290	19
Less: Noncontrolling Interest [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance			(476)	(229)
Net change			146	(537)
Ending Balance	(330)	(766)	(330)	(766)
Accumulated Other Comprehensive Loss Attributable to Ampco-Pittsburgh [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance			(62,989)	(58,412)
Net change			2,086	(2,392)
Ending Balance	(60,903)	(60,804)	(60,903)	(60,804)
Total Accumulated Other Comprehensive Loss [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance			(63,465)	(58,641)
Net change			2,232	(2,929)
Ending Balance	$ (61,233)	$ (61,570)	$ (61,233)	$ (61,570)

Accumulated Other Comprehensi_4

Accumulated Other Comprehensive Loss - Line Items Affected on Consolidated Statements of Operations for Components Reclassified from Accumulated Other Comprehensive Loss (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]
Depreciation and amortization (foreign currency purchase contracts)	$ (4,586)	$ (4,382)	$ (13,954)	$ (13,110)
Costs of products sold (excluding depreciation and amortization) (futures contracts - copper and aluminum)	(76,389)	(84,490)	(256,563)	(256,333)
(Loss) income before income taxes	(818)	1,311	845	3,757
Other income (loss) - net	211	1,959	2,496	3,424
Income tax effect	(636)	(76)	(1,953)	(541)
Net (loss) income attributable to Ampco-Pittsburgh	(1,959)	809	(2,664)	1,908
Amortization of Unrecognized Employee Benefit Costs [Member] | Reclassification Out of Accumulated Other Comprehensive Income (Loss) [Member]
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]
Other income (loss) - net	(177)	(223)	(534)	(670)
Income tax effect	0	(12)		(58)
Net (loss) income attributable to Ampco-Pittsburgh	(177)	(235)	(534)	(728)
Settlements of Cash Flow Hedges [Member] | Reclassification Out of Accumulated Other Comprehensive Income (Loss) [Member]
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]
Depreciation and amortization (foreign currency purchase contracts)	(6)	(6)	(20)	(20)
Costs of products sold (excluding depreciation and amortization) (futures contracts - copper and aluminum)	(7)	146	(267)	(33)
(Loss) income before income taxes	(13)	140	(287)	(53)
Income tax effect		(5)	7	1
Net (loss) income attributable to Ampco-Pittsburgh	$ (13)	$ 135	$ (280)	$ (52)

Accumulated Other Comprehensi_5

Accumulated Other Comprehensive Loss - Additional Information (Detail) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Valuation Allowance Against Gross Deferred Income Tax Assets [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Tax effect due to certain amounts	$ 0	$ 0	$ 0	$ 0

Accumulated Other Comprehensi_6

Accumulated Other Comprehensive Loss - Summary of Income Tax Effect Associated With Various Components of Other Comprehensive (Loss) Income (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Equity [Abstract]
Fair value of cash flow hedges	$ (5)		$ (10)	$ 3
Amortization of unrecognized employee benefit costs		$ (12)		(58)
Settlement of cash flow hedges		$ (5)	$ 7	$ 1

Derivative Instruments - Additi

Derivative Instruments - Additional Information (Detail)	3 Months Ended		9 Months Ended
	Sep. 30, 2024 USD ($) Customer Derivative	Sep. 30, 2023 USD ($) Customer	Sep. 30, 2024 USD ($) Customer Derivative	Sep. 30, 2023 USD ($) Customer
Derivative [Line Items]
Number of subsidiaries for purchases of natural gas under existing commitments | Customer	2	1	2	1
Purchases of natural gas under existing commitments description			for two of its subsidiaries	for one of its subsidiaries
Number of subsidiaries for usage of electricity under existing commitments | Customer	2	1	2	1
Usage of electricity under existing commitments description			for two of its subsidiaries.	for one of its subsidiaries
Number of derivative instruments holds for trading purposes | Derivative	0		0
(Loss) gain on foreign exchange transactions included in other income net	$ (1,130,000)	$ 892,000	$ (1,320,000)	$ (267,000)
Natural Gas Usage [Member]
Derivative [Line Items]
Percentage of anticipated purchases hedged	3%	32%	3%	32%
Anticipated purchases, hedged	$ 1,568,000	$ 2,942,000	$ 1,568,000	$ 2,942,000
Time period for hedged usage description			natural gas usage through December 31, 2025	natural gas usage through December 31, 2025
Electricity Usage [Member]
Derivative [Line Items]
Percentage of anticipated purchases hedged	9%	21%	9%	21%
Anticipated purchases, hedged	$ 945,000	$ 1,116,000	$ 945,000	$ 1,116,000
Time period for hedged usage description			electricity usage through December 31, 2025	electricity usage through December 31, 2025
Natural Gas And Electricity Purchased [Member]
Derivative [Line Items]
Purchase of natural gas or electricity	$ 674,000	$ 812,000	$ 2,507,000	$ 2,249,000
Copper Purchases [Member]
Derivative [Line Items]
Percentage of anticipated purchases hedged	43%	46%	43%	46%
Time period for hedged purchases			9 months	10 months
Copper Purchases [Member] | Cash Flow Hedges [Member]
Derivative [Line Items]
Anticipated purchases, hedged	$ 2,853,000	$ 2,771,000	$ 2,853,000	$ 2,771,000
Aluminum Purchases [Member]
Derivative [Line Items]
Percentage of anticipated purchases hedged	56%	56%	56%	56%
Time period for hedged purchases			6 months	6 months
Aluminum Purchases [Member] | Cash Flow Hedges [Member]
Derivative [Line Items]
Anticipated purchases, hedged	$ 615,000	$ 565,000	$ 615,000	$ 565,000

Derivative Instruments - Summar

Derivative Instruments - Summary of Amount Recognized as and Reclassified from Accumulated Other Comprehensive Income (Loss) (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Derivative [Line Items]
Beginning of the Period	$ 129	$ (135)	$ 186	$ 152
Recognized	174	19	384	(81)
Reclassified	13	(135)	280	52
End of the Period	290	19	290	19
Foreign Currency Purchase Contracts [Member]
Derivative [Line Items]
Beginning of the Period	67	94	81	108
Reclassified	6	6	20	20
End of the Period	61	88	61	88
Futures Contracts - Copper and Aluminum [Member]
Derivative [Line Items]
Beginning of the Period	62	(229)	105	44
Recognized	174	19	384	(81)
Reclassified	7	(141)	260	32
End of the Period	$ 229	$ (69)	$ 229	$ (69)

Derivative Instruments - Summ_2

Derivative Instruments - Summary of Change in Fair Value Reclassified or Expected to be Reclassified from Accumulated Other Comprehensive Loss to Earnings (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Derivative [Line Items]
Depreciation and amortization	$ 4,586	$ 4,382	$ 13,954	$ 13,110
Costs of products sold (excluding depreciation and amortization)	76,389	84,490	256,563	256,333
Reclassification Out of Accumulated Other Comprehensive Income (Loss) [Member] | Settlements of Cash Flow Hedges [Member]
Derivative [Line Items]
Depreciation and amortization	6	6	20	20
Costs of products sold (excluding depreciation and amortization)	7	(146)	267	33
Foreign Currency Purchase Contracts [Member] | Reclassification Out of Accumulated Other Comprehensive Income (Loss) [Member] | Settlements of Cash Flow Hedges [Member]
Derivative [Line Items]
Estimated to be Reclassified in the Next 12 Months	28		28
Depreciation and amortization	6	6	20	20
Futures Contracts - Copper and Aluminum [Member] | Reclassification Out of Accumulated Other Comprehensive Income (Loss) [Member] | Settlements of Cash Flow Hedges [Member]
Derivative [Line Items]
Estimated to be Reclassified in the Next 12 Months	235		235
Costs of products sold (excluding depreciation and amortization)	$ 7	$ (146)	$ 267	$ 33

Fair Value - Fair Value of Fina

Fair Value - Fair Value of Financial Assets and Liabilities (Detail) - Investments [Member] - Other Noncurrent Assets [Member] - USD ($) $ in Thousands	Sep. 30, 2024	Dec. 31, 2023
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Assets, fair value	$ 3,204	$ 3,245
Quoted Prices in Active Markets for Identical Inputs (Level 1) [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Assets, fair value	$ 3,204	$ 3,245

Net Sales and (Loss) Income B_3

Net Sales and (Loss) Income Before Income Taxes - Additional Information (Detail)	Sep. 30, 2024	Sep. 30, 2023
Net Sales And Income Loss Before Income Taxes [Abstract]
Percentage of foreign net sales	95%	95%

Net Sales and (Loss) Income B_4

Net Sales and (Loss) Income Before Income Taxes - Net Sales and (Loss) Income Before Income Taxes (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Disaggregation Of Revenue [Line Items]
Net sales	$ 96,166	$ 102,218	$ 317,369	$ 314,232
(Loss) income before income taxes:	(818)	1,311	845	3,757
U.S. [Member]
Disaggregation Of Revenue [Line Items]
Net sales	59,556	63,118	202,236	182,247
(Loss) income before income taxes:	837	350	(181)	(3,119)
Foreign [Member]
Disaggregation Of Revenue [Line Items]
Net sales	36,610	39,100	115,133	131,985
(Loss) income before income taxes:	$ (1,655)	$ 961	$ 1,026	$ 6,876

Net Sales and (Loss) Income B_5

Net Sales and (Loss) Income Before Income Taxes - Net Sales and (Loss) Income Before Income Taxes (Parenthetical) (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Net Sales And Income Loss Before Income Taxes [Abstract]
Corporate costs	$ 3,720	$ 3,182	$ 10,688	$ 9,959

Stock-Based Compensation - Addi

Stock-Based Compensation - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense	$ 372	$ 520	$ 1,106	$ 1,630
Incentive Plan [Member] | Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares authorized under Omnibus Incentive Plan	3,700,000		3,700,000
Equity based awards grant date fair value			$ 200

Litigation - Schedule of Loss C

Litigation - Schedule of Loss Contingencies by Contingency (Detail) - Asbestos Claims [Member]	9 Months Ended
	Sep. 30, 2024 USD ($) Claim	Sep. 30, 2023 USD ($) Claim
Loss Contingencies [Line Items]
Total claims pending at the beginning of the period	6,310	6,259
New claims served	950	984
Claims dismissed	(517)	(647)
Claims settled	(419)	(305)
Total claims pending at the end of period	6,324	6,291
Administrative closures	(3,117)	(2,903)
Total active claims at the end of the period	3,207	3,388
Gross settlement and defense costs paid in period | $	$ 18,610,000	$ 16,221,000
Average gross settlement and defense costs per claim resolved | $	$ 19,880	$ 17,040

Litigation - Schedule of Loss_2

Litigation - Schedule of Loss Contingencies by Contingency (Parenthetical) (Detail) - Claim	9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023
Loss Contingencies [Line Items]
Number of claims inactive or transferred to MDL panel	1,638	1,642
Mesothelioma Claims [Member]
Loss Contingencies [Line Items]
Administrative closures claims period	5 years	6 years
Non Mesothelioma Claims [Member]
Loss Contingencies [Line Items]
Administrative closures claims period	6 years

Litigation - Additional Informa

Litigation - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended			9 Months Ended		12 Months Ended
	Jun. 30, 2024	Dec. 31, 2023	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023	Dec. 31, 2022
Loss Contingencies [Line Items]
Reimbursement of prior year insurance cost				$ 1,756
Increase (decrease) to estimated asbestos liability for claims pending or projected		$ 112,640
Defense-to-indemnity cost ratio		60%				65%
Effect of asbestos liability from a lower defense-to-indemnity ratio		$ 4,162
Asbestos receivable due to increase in asbestos liability and lower defense to indemnity ratio		$ 67,591
Credit for asbestos litigation			$ 191		$ 191
Settlement Agreements [Member]
Loss Contingencies [Line Items]
Reimbursement of prior year insurance cost	$ 1,756

Litigation - Summary of Activit

Litigation - Summary of Activity Relating to Asbestos Liability (Detail) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023
Commitments and Contingencies Disclosure [Abstract]
Asbestos liability, beginning of the year	$ 238,679	$ 153,575
Settlement and defense costs paid	(18,610)	(16,221)
Asbestos liability, end of the period	$ 220,069	$ 137,354

Litigation - Summary of Activ_2

Litigation - Summary of Activity in Asbestos Insurance Recoveries (Detail) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023
Loss Contingencies [Line Items]
Insurance receivable -- asbestos, beginning of the year	$ 708
Insurance receivable – asbestos, end of the period	708
Asbestos Claims [Member]
Loss Contingencies [Line Items]
Insurance receivable -- asbestos, beginning of the year	160,245	$ 105,434
Settlement and defense costs paid by insurance carriers	(13,841)	(9,041)
Insurance receivable – asbestos, end of the period	$ 146,404	$ 96,393

Environmental Matters - Additio

Environmental Matters - Additional Information (Detail) - USD ($) $ in Thousands	Sep. 30, 2024	Dec. 31, 2023
Environmental Remediation Obligations [Abstract]
Undiscounted potential liability for all environmental compliance	$ 100	$ 100
Environmental Loss Contingency, Statement of Financial Position [Extensible Enumeration]	Other Liabilities, Noncurrent	Other Liabilities, Noncurrent

Related Parties - Additional In

Related Parties - Additional Information (Detail) ¥ in Thousands, $ in Thousands	3 Months Ended				9 Months Ended
	Sep. 30, 2024 USD ($)	Sep. 30, 2024 CNY (¥)	Sep. 30, 2023 USD ($)	Sep. 30, 2023 CNY (¥)	Sep. 30, 2024 USD ($)	Sep. 30, 2024 CNY (¥)	Sep. 30, 2023 USD ($)	Sep. 30, 2023 CNY (¥)	Feb. 20, 2024	Feb. 16, 2024	Dec. 31, 2023 USD ($)
Related Party Transaction [Line Items]
Trade receivable	$ 74,727				$ 74,727						$ 78,939
Subsidiary [Member] | Crawford Group [Member]
Related Party Transaction [Line Items]
Trade receivable											$ 722
Schedule 13D filed date									Feb. 20, 2024
Ceased date of beneficial stock ownership										Feb. 16, 2024
Minimum [Member] | Subsidiary [Member] | Crawford Group [Member]
Related Party Transaction [Line Items]
Beneficial stock ownership percentage											5%
Ceased beneficially stock ownership percentage										5%
ATR [Member]
Related Party Transaction [Line Items]
Effective interest rate	4.35%	4.35%	4.35%	4.35%	4.35%	4.35%	4.35%	4.35%
Interest paid					$ 2	¥ 17	$ 5	¥ 35
Accrued interest	$ 0				$ 0						$ 0
Land lease commenced year					2007	2007
Land lease expiry year					2054	2054
Rent paid	$ 34	¥ 223	$ 34	¥ 223	$ 95	¥ 669	$ 95	¥ 669
ATR [Member] | Minimum [Member]
Related Party Transaction [Line Items]
Interest accrual period	3 years	3 years	3 years	3 years	3 years	3 years	3 years	3 years
ATR [Member] | Maximum [Member]
Related Party Transaction [Line Items]
Interest accrual period	5 years	5 years	5 years	5 years	5 years	5 years	5 years	5 years

Related Parties - Summary of Lo

Related Parties - Summary of Loan Activity (Detail) ¥ in Thousands, $ in Thousands	9 Months Ended
	Sep. 30, 2024 USD ($)	Sep. 30, 2024 CNY (¥)	Sep. 30, 2023 USD ($)	Sep. 30, 2023 CNY (¥)
Related Party Transaction [Line Items]
Borrowings			$ 1,099
Repayments	$ (664)		(1,096)
ATR [Member]
Related Party Transaction [Line Items]
Balance at beginning of the period	665	¥ 4,713	0	¥ 0
Borrowings	0	0	1,099	7,604
Repayments	(664)	(4,713)	(1,096)	(7,604)
Foreign exchange	(1)	0	(3)	0
Balance at end of the period	$ 0	¥ 0	$ 0	¥ 0

Related Parties - Summary of Sa

Related Parties - Summary of Sales to and Purchases from ATR's Minority Shareholder and Its Affiliates (Detail) ¥ in Thousands, $ in Thousands	3 Months Ended				9 Months Ended
	Sep. 30, 2024 USD ($)	Sep. 30, 2024 CNY (¥)	Sep. 30, 2023 USD ($)	Sep. 30, 2023 CNY (¥)	Sep. 30, 2024 USD ($)	Sep. 30, 2024 CNY (¥)	Sep. 30, 2023 USD ($)	Sep. 30, 2023 CNY (¥)
Related Party Transaction [Line Items]
Sales to related parties	$ 96,166		$ 102,218		$ 317,369		$ 314,232
ATR [Member]
Related Party Transaction [Line Items]
Purchases from related parties	1,994	¥ 14,221	1,913	¥ 13,752	5,132	¥ 36,809	5,236	¥ 36,885
ATR [Member] | Related Party [Member]
Related Party Transaction [Line Items]
Sales to related parties	$ 4,094	¥ 29,156	$ 18	¥ 346	$ 12,267	¥ 87,980	$ 2,741	¥ 19,306

Related Parties - Summary of Ba

Related Parties - Summary of Balances Outstanding with ATR's Minority Shareholder and Its Affiliates (Detail) ¥ in Thousands, $ in Thousands	Sep. 30, 2024 USD ($)	Sep. 30, 2024 CNY (¥)	Dec. 31, 2023 USD ($)	Dec. 31, 2023 CNY (¥)
Related Party Transaction [Line Items]
Accounts receivable from related parties	$ 74,727		$ 78,939
Accounts payable to related parties	29,772		36,830
ATR [Member]
Related Party Transaction [Line Items]
Customer deposits			149	¥ 1,056
ATR [Member] | Related Party [Member]
Related Party Transaction [Line Items]
Accounts receivable from related parties	2,511	¥ 17,622	190	1,350
Accounts payable to related parties	$ 2,066	¥ 14,499	$ 401	¥ 2,841

Business Segments - Additional

Business Segments - Additional Information (Detail)	9 Months Ended
	Sep. 30, 2024 Company Segment
Segment Reporting Information [Line Items]
Number of reportable business segments | Segment	2
Chinese Joint Venture Company [Member]
Segment Reporting Information [Line Items]
Equity interest in number of joint venture | Company	3

Business Segments - Business Se

Business Segments - Business Segment Net Sales and (Loss) Income before Income Taxes (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Revenue from External Customer [Line Items]
Net sales	$ 96,166	$ 102,218	$ 317,369	$ 314,232
(Loss) income before income taxes:	(818)	1,311	845	3,757
Operating Segments [Member]
Revenue from External Customer [Line Items]
Net sales	96,166	102,218	317,369	314,232
(Loss) income before income taxes:	5,590	4,904	17,683	16,962
Operating Segments [Member] | Forged and Cast Mill Rolls [Member]
Revenue from External Customer [Line Items]
Net sales	63,833	68,325	209,876	213,027
Operating Segments [Member] | FEP [Member]
Revenue from External Customer [Line Items]
Net sales	3,370	5,300	10,229	14,977
Operating Segments [Member] | Forged and Cast Engineered Products [Member]
Revenue from External Customer [Line Items]
Net sales	67,203	73,625	220,105	228,004
(Loss) income before income taxes:	2,456	1,448	9,393	7,576
Operating Segments [Member] | Air and Liquid Processing [Member]
Revenue from External Customer [Line Items]
Net sales	28,963	28,593	97,264	86,228
(Loss) income before income taxes:	3,134	3,456	8,290	9,386
Operating Segments [Member] | Air Handling Systems [Member]
Revenue from External Customer [Line Items]
Net sales	8,853	9,357	35,406	27,453
Operating Segments [Member] | Heat Exchange Coils [Member]
Revenue from External Customer [Line Items]
Net sales	10,824	10,068	33,626	31,808
Operating Segments [Member] | Centrifugal Pumps [Member]
Revenue from External Customer [Line Items]
Net sales	9,286	9,168	28,232	26,967
Other Expense, Including Corporate Costs - Net [Member]
Revenue from External Customer [Line Items]
(Loss) income before income taxes:	$ (6,408)	$ (3,593)	$ (16,838)	$ (13,205)

Business Segments - Business _2

Business Segments - Business Segment Net Sales and (Loss) Income before Income Taxes (Parenthetical) (Detail) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
	Sep. 30, 2023	Sep. 30, 2023
Revenue from External Customer [Line Items]
Credit for asbestos litigation	$ 191	$ 191
Forged And Cast Engineered Products [Member]
Revenue from External Customer [Line Items]
Proceeds from reimbursement of past energy costs		1,874
Air and Liquid Processing [Member]
Revenue from External Customer [Line Items]
Credit for asbestos litigation	$ 191	$ 191