Ampco-Pittsburgh (AP) 10-K 16 Mar 18 2017 FY Annual report Financial data

Document and Entity Information

Document and Entity Information - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Mar. 12, 2018	Jun. 30, 2017
Document And Entity Information [Abstract]
Document Type	10-K
Amendment Flag	false
Document Period End Date	Dec. 31, 2017
Document Fiscal Year Focus	2,017
Document Fiscal Period Focus	FY
Trading Symbol	AP
Entity Registrant Name	AMPCO PITTSBURGH CORP
Entity Central Index Key	6,176
Current Fiscal Year End Date	--12-31
Entity Well-known Seasoned Issuer	No
Entity Current Reporting Status	Yes
Entity Voluntary Filers	No
Entity Filer Category	Accelerated Filer
Entity Common Stock, Shares Outstanding		12,362,198
Entity Public Float			$ 89

Consolidated Balance Sheets

Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Current assets:
Cash and cash equivalents	$ 20,700	$ 38,579
Receivables, less allowance for doubtful accounts of $962 in 2017 and $2,228 in 2016	86,623	72,233
Inventories	107,561	83,579
Insurance receivable – asbestos	13,000	13,000
Other current assets	12,363	14,073
Total current assets	240,247	221,464
Property, plant and equipment, net	214,980	214,408
Insurance receivable – asbestos	87,342	102,945
Deferred income tax assets	1,590	4,824
Investments in joint ventures	2,175	2,019
Intangible assets, net	11,021	11,601
Other noncurrent assets	8,244	8,628
Total assets	565,599	565,889
Current liabilities:
Accounts payable	47,479	37,104
Accrued payrolls and employee benefits	22,768	20,166
Debt – current portion	19,335	26,825
Asbestos liability – current portion	18,000	18,000
Other current liabilities	37,089	42,197
Total current liabilities	144,671	144,292
Employee benefit obligations	79,750	91,947
Asbestos liability	131,750	153,181
Deferred income tax liabilities	433	591
Long-term debt	46,818	25,389
Other noncurrent liabilities	416	655
Total liabilities	403,838	416,055
Commitments and contingent liabilities (Note 10)
Shareholders’ equity:
Common stock – par value $1; authorized 20,000 shares; issued and outstanding 12,361 shares in 2017 and 12,271 shares in 2016	12,361	12,271
Additional paid-in capital	152,992	151,089
Retained earnings	38,348	45,443
Accumulated other comprehensive loss	(44,760)	(60,885)
Total Ampco-Pittsburgh shareholders’ equity	158,941	147,918
Noncontrolling interest	2,820	1,916
Total shareholders’ equity	161,761	149,834
Total liabilities and shareholders’ equity	$ 565,599	$ 565,889

Consolidated Balance Sheets (Pa

Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Statement Of Financial Position [Abstract]
Receivables, allowance for doubtful accounts	$ 962	$ 2,228
Common stock, par value	$ 1	$ 1
Common stock, shares authorized	20,000,000	20,000,000
Common stock, shares issued	12,361,000	12,271,000
Common stock, shares outstanding	12,361,000	12,271,000

Consolidated Statements of Oper

Consolidated Statements of Operations - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Income Statement [Abstract]
Net sales	$ 432,401	$ 331,866	$ 238,480
Operating costs and expenses:
Costs of products sold (excluding depreciation and amortization)	357,672	276,496	196,091
Selling and administrative	61,310	58,175	39,510
Depreciation and amortization	22,387	20,463	11,787
Charge (credit) for asbestos litigation	0	4,565	(14,333)
Charges for impairment	0	26,676	0
Loss on disposition of assets	401	21	378
Total operating expenses	441,770	386,396	233,433
(Loss) income from operations	(9,369)	(54,530)	5,047
Other income (expense):
Investment-related income	133	481	174
Interest expense	(3,525)	(2,397)	(226)
Other – net	(932)	(1,074)	(475)
Total other income (expense)	(4,324)	(2,990)	(527)
(Loss) income before income taxes and equity gains (losses) in joint venture	(13,693)	(57,520)	4,520
Income tax benefit (provision)	1,355	(22,712)	(2,633)
Equity gains (losses) in joint venture, including gain on sale (Note 3)	1,036	423	(514)
Net (loss) income	(11,302)	(79,809)	1,373
Less: Net income attributable to noncontrolling interest	787	11	0
Net (loss) income attributable to Ampco-Pittsburgh	$ (12,089)	$ (79,820)	$ 1,373
Net (loss) income per common share attributable to Ampco-Pittsburgh:
Basic	$ (0.98)	$ (6.68)	$ 0.13
Diluted	$ (0.98)	$ (6.68)	$ 0.13
Weighted average number of common shares outstanding:
Basic	12,330,000	11,951,000	10,435,000
Diluted	12,330,401	11,951,181	10,447,066

Consolidated Statements of Comp

Consolidated Statements of Comprehensive Income (Loss) (Unaudited) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Statement Of Income And Comprehensive Income [Abstract]
Net (loss) income	$ (11,302)	$ (79,809)	$ 1,373
Adjustments for changes in:
Foreign exchange translation	11,041	(14,580)	(3,967)
Unrecognized employee benefit costs (including effects of foreign currency translation)	7,299	9,397	10,713
Unrealized holding gains (losses) on marketable securities	602	405	(239)
Fair value of cash flow hedges	804	398	(475)
Reclassification adjustments for items included in net (loss) income:
Amortization of unrecognized employee benefit costs	3,283	1,910	4,740
Realized gains from sale of marketable securities	(29)	(1,038)	(53)
Realized (gains) losses from settlement of cash flow hedges	(670)	108	435
Other comprehensive income (loss)	22,330	(3,400)	11,154
Comprehensive income (loss)	11,028	(83,209)	12,527
Less: Comprehensive income (loss) attributable to noncontrolling interest	904	(103)	0
Comprehensive income (loss) income attributable to Ampco-Pittsburgh	$ 10,124	$ (83,106)	$ 12,527

Consolidated Statements of Shar

Consolidated Statements of Shareholders' Equity - USD ($) $ in Thousands	Total	Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Loss [Member]	Noncontrolling Interest [Member]
Beginning Balance at Dec. 31, 2014	$ 205,148	$ 10,426	$ 127,526	$ 135,949	$ (68,753)	$ 0
Stock-based compensation	1,103		1,103
Comprehensive (loss) income:
Net (loss) income	1,373			1,373
Other comprehensive (loss) income	11,154				11,154
Comprehensive income (loss)	12,527
Issuance of common stock including excess tax benefits of $0,$0,$0 for 2015, 2016 and 2017	225	14	211
Cash dividends ($0.72, $0.36 and $0.09 per share for 2015, 2016 and 2017)	(7,580)			(7,580)
Ending Balance at Dec. 31, 2015	211,423	10,440	128,840	129,742	(57,599)	0
Noncontrolling interest associated with Åkersacquisition (Note 2)	2,019					2,019
Stock-based compensation	1,482		1,482
Comprehensive (loss) income:
Net (loss) income	(79,809)			(79,820)		11
Other comprehensive (loss) income	(3,400)				(3,286)	(114)
Comprehensive income (loss)	(83,209)					(103)
Issuance of common stock including excess tax benefits of $0,$0,$0 for 2015, 2016 and 2017	22,598	1,831	20,767
Cash dividends ($0.72, $0.36 and $0.09 per share for 2015, 2016 and 2017)	(4,479)			(4,479)
Ending Balance at Dec. 31, 2016	149,834	12,271	151,089	45,443	(60,885)	1,916
Stock-based compensation	1,555		1,555
Comprehensive (loss) income:
Net (loss) income	(11,302)			(12,089)		787
Other comprehensive (loss) income	22,330				22,213	117
Comprehensive income (loss)	11,028					904
Stranded tax effect (Note 15)	0			6,088	(6,088)
Issuance of common stock including excess tax benefits of $0,$0,$0 for 2015, 2016 and 2017	438	90	348
Cash dividends ($0.72, $0.36 and $0.09 per share for 2015, 2016 and 2017)	(1,094)			(1,094)
Ending Balance at Dec. 31, 2017	$ 161,761	$ 12,361	$ 152,992	$ 38,348	$ (44,760)	$ 2,820

Consolidated Statements of Sha7

Consolidated Statements of Shareholders' Equity (Parenthetical) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Issuance of common stock tax benefits	$ 0	$ 0	$ 0
Cash dividends	$ 0.09	$ 0.36	$ 0.72
Common Stock [Member]
Issuance of common stock tax benefits	$ 0	$ 0	$ 0
Additional Paid-in Capital [Member]
Issuance of common stock tax benefits	$ 0	0	$ 0
Retained Earnings [Member]
Issuance of common stock tax benefits		$ 0
Cash dividends	$ 0.09	$ 0.36	$ 0.72

Consolidated Statements of Cash

Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Cash flows from operating activities:
Net (loss) income	$ (11,302)	$ (79,809)	$ 1,373
Adjustments to reconcile net (loss) income to net cash flows from operating activities:
Depreciation and amortization	22,387	20,463	11,787
Charges for impairment	0	26,676	0
Charge for asbestos litigation	0	5,631	0
Deferred income tax provision (benefit), including valuation allowance	3,177	23,407	(2,302)
Difference between pension and other postretirement expense and contributions	(1,857)	(1,948)	4,972
Stock-based compensation	2,400	2,332	1,328
Equity (gains) losses in joint venture, including gain on sale (Note 3)	(1,036)	(423)	514
Provisions for bad debts and inventories	305	2,348	862
Provision for warranties net of settlements	(413)	(1,015)	(159)
Loss on disposition of assets	401	21	378
Gain on sale of long-term marketable securities	0	(1,404)	0
Other – net	1,569	(279)	577
Changes in assets/liabilities:
Receivables	(12,916)	5,697	9,391
Inventories	(20,359)	8,308	(4,527)
Other assets, including insurance receivable – asbestos	19,351	20,466	15,300
Accounts payable	7,818	(8,819)	(3,003)
Accrued payrolls and employee benefits	1,101	1,051	452
Other liabilities, including asbestos liability	(26,465)	(28,337)	(16,438)
Net cash flows (used in) provided by operating activities	(15,839)	(5,634)	20,505
Cash flows from investing activities:
Purchases of property, plant and equipment	(14,899)	(10,566)	(9,407)
Purchase of Åkers AB, net of cash acquired (Note 2)	0	(27,031)	0
Purchase of ASW Steel Inc., net of cash acquired (Note 2)	0	(3,265)	0
Purchase of Alloys Unlimited & Processing, Inc. (Note 2)	0	0	(5,000)
Proceeds from sale of investment in joint venture (Note 3)	1,500	0	0
Purchases of long-term marketable securities	(109)	(4,662)	(631)
Proceeds from sale of long-term marketable securities	327	4,646	728
Other	0	0	11
Net cash flows used in investing activities	(13,181)	(40,878)	(14,299)
Cash flows from financing activities:
Dividends paid	(2,236)	(5,206)	(7,512)
Debt issuance costs (Note 8)	0	(1,247)	0
Repayment of debt	(1,318)	(962)	0
Proceeds from Revolving Credit and Security Agreement (Note 8)	25,349	0	0
Payments on Revolving Credit and Security Agreement (Note 8)	(5,000)	0	0
Proceeds from ASW credit facility (Note 8)	8,795	9,756	0
Payments on ASW credit facility (Note 8)	(15,941)	(11,217)	0
Net cash flows provided by (used in) financing activities	9,649	(8,876)	(7,512)
Effect of exchange rate changes on cash and cash equivalents	1,492	(1,155)	(670)
Net decrease in cash and cash equivalents	(17,879)	(56,543)	(1,976)
Cash and cash equivalents at beginning of year	38,579	95,122	97,098
Cash and cash equivalents at end of year	20,700	38,579	95,122
Supplemental disclosures of cash flow information:
Income tax payments	844	4,404	3,247
Interest payments	1,283	957	225
Non-cash investing activities:
Purchases of property, plant and equipment in accounts payable	1,068	996	329
Non-cash financing activities:
Issuance of common stock to acquire net assets of Åkers (Note 2)	0	22,137	0
Issuance of debt to acquire net assets of Åkers (Note 2)	$ 0	$ 22,619	$ 0

Description of Business

Description of Business	12 Months Ended
	Dec. 31, 2017
Accounting Policies [Abstract]
Description of Business	Description of Business Ampco-Pittsburgh Corporation and its subsidiaries (the “Corporation”) manufacture and sell highly engineered, high-performance specialty metal products and customized equipment utilized by industry throughout the world. It operates in two business segments, the Forged and Cast Engineered Products segment and the Air and Liquid Processing segment. The Forged and Cast Engineered Products In addition, Union Electric Steel produces ingot and open-die forged products (“forged engineered products”) which are used in the oil and gas industry and the aluminum and plastic extrusion industries. In July 2015, UES acquired the assets of Alloys Unlimited & Processing, Inc. (“AUP”) and, in November 2016, the stock of ASW Steel Inc. (“ASW”). AUP is a supplier of specialty tool, alloy, and carbon steel round bar located in Ohio. ASW is a specialty steel producer based in Ontario, Canada. Both acquisitions support the Corporation’s diversification efforts in the open-die forging market. The segment primarily competes with European, Asian and North 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 consolidated financial statements of the Corporation include the financial position and results of operations of the acquired companies from their respective dates of acquisition. The Air and Liquid Processing

Summary of Significant Accounti

Summary of Significant Accounting Policies	12 Months Ended
	Dec. 31, 2017
Accounting Policies [Abstract]
Summary of Significant Accounting Policies	NOTE 1 – SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES: The Corporation’s accounting policies conform to accounting principles generally accepted in the United States of America. The preparation of financial statements in conformity with accounting principles generally accepted in the United States of America requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities as of the date of the financial statements and the reported amounts of revenues and expenses during the reporting period. Significant items subject to estimates and assumptions include assessing the carrying value of long-lived assets, determining the fair value of assets acquired and liabilities assumed in a business combination (including intangibles and goodwill and the recoverability thereof), valuing the assets and obligations related to employee benefit plans, accounting for loss contingencies associated with claims and lawsuits, and accounting for income taxes. Actual results could differ from those estimates. A summary of the significant accounting policies followed by the Corporation is presented below. Consolidation The accompanying consolidated financial statements include the assets, liabilities, revenues and expenses of all majority owned subsidiaries and joint ventures over which the Corporation exercises control and, when applicable, entities for which the Corporation has a controlling financial interest or is the primary beneficiary. Investments in joint ventures where the Corporation owns 20% to 50% of the voting stock and has the ability to exercise significant influence over the operating and financial policies of the joint venture are accounted for using the equity method of accounting. Investments in joint ventures whereby the Corporation does not have the ability to exercise significant influence over the operating and financial policies of the joint venture are accounted for using the cost method of accounting. Investments in joint ventures are reviewed for impairment whenever events or circumstances indicate the carrying amount of the investment may not be recoverable. If the estimated fair value of the investment is less than the carrying amount and such decline is determined to be “other than temporary,” then the investment may not be fully recoverable potentially resulting in a write-down of the investment value. Intercompany accounts and transactions are eliminated. Cash and Cash Equivalents Securities with purchased original maturities of three months or less are considered to be cash equivalents. The Corporation maintains cash and cash equivalents at various financial institutions which may exceed federally insured amounts. Inventories Inventories are valued at the lower of cost and net realizable value, which is defined as the estimated selling price in the ordinary course of business less reasonably predictable costs of completion, disposal and transportation. Cost includes the cost of raw materials, direct labor and overhead for those items manufactured but not yet sold or for which title has not yet transferred. Fixed production overhead is allocated to inventories based on normal capacity of the production facilities. In periods of abnormally high production, the amount of fixed overhead allocated to each unit of production is decreased so that inventories are not measured above cost. The amount of fixed overhead allocated to inventories is not increased as a consequence of abnormally low production or plant idling. Costs for abnormal amounts of spoilage, handling costs and freight costs are charged to expense when incurred. Cost of domestic raw materials, work-in-process and finished goods inventories is primarily determined by the last-in, first-out (LIFO) method. Cost of domestic supplies and foreign inventories is determined primarily by the first-in, first-out (FIFO) method. Property, Plant and Equipment Property, plant and equipment purchased new is recorded at cost with depreciation computed using the straight-line method over the following estimated useful lives: land improvements – 15 to 20 years, buildings – 25 to 50 years and machinery and equipment – 3 to 25 years. Property, plant and equipment acquired as part of a business combination is recorded at its estimated fair value with depreciation computed using the straight-line method over the estimated remaining useful lives based in part on third-party valuations. Expenditures that extend economic useful lives are capitalized. Routine maintenance is charged to expense. Gains or losses are recognized on retirements or disposals. Property, plant and equipment are reviewed for impairment at least annually, or whenever events or changes in circumstances indicate the carrying amount of the asset may not be recoverable. If the undiscounted cash flows generated from the use and eventual disposition of the assets are less than their carrying value, then the asset value may not be fully recoverable potentially resulting in a write-down of the asset value. Estimates of future cash flows are based on expected market conditions over the remaining useful life of the primary asset(s). In addition, the remaining depreciation period for the impaired asset would be reassessed and, if necessary, revised. Proceeds from government grants are recorded as a reduction in the purchase price of the underlying assets and amortized against depreciation over the lives of the related assets. Intangible Assets Intangible assets primarily consist of developed technology, customer relationships and trade name. Intangible assets with definite lives are amortized using the straight-line method over their estimated useful life, which is determined by identifying the period over which most of the cash flows are expected to be generated. Additionally, intangible assets, both definite and indefinite lived, are reviewed for impairment at least annually, as of October 1, or whenever events or changes in circumstances indicate the carrying amount of the asset may not be recoverable. If the undiscounted cash flows attributable to the assets are less than their carrying value, then the asset value may not be fully recoverable potentially resulting in a write-down of the asset value. Also, if the estimate of an intangible asset’s remaining useful life changes, the remaining carrying value of the intangible asset will be amortized prospectively over the revised remaining useful life. Goodwill Goodwill represents the consideration paid in a business combination in excess of the values assigned to the net assets of the acquired entity. Goodwill is not amortized but is tested for impairment at the reporting unit level annually, as of October 1, or whenever events or changes in circumstances indicate the carrying amount may not be recoverable. Goodwill is evaluated for impairment either qualitatively or quantitatively using a two-step approach. Under step one, the fair value of the reporting unit is determined using both a market and income approach. If the fair value of the reporting unit is less than the carrying value of the reporting unit, then goodwill may be impaired causing the second step of the analysis to be completed. Under step two, the fair value of the reporting is allocated to the assets and liabilities of the reporting unit. The unallocated fair value (“implied goodwill”), if any, is compared to the recorded value of goodwill. If the implied goodwill exceeds the recorded value of goodwill, then goodwill is deemed not to be impaired. If the implied goodwill is less than the recorded value of goodwill, then goodwill is deemed to be impaired by the amount that goodwill exceeds implied goodwill. Estimating the fair value of a reporting unit requires the use of significant unobservable inputs, representative of a Level 3 fair value measurement, including market growth and market share, sales volumes and prices, costs to produce, discount rate and estimated capital needs. Management considers historical experience and all available information at the time the fair value of the reporting unit is estimated. Assumptions used to estimate future cash flows are subject to a high degree of judgment and complexity. Debt Issuance Costs Debt issuance costs are amortized as interest expense over the scheduled maturity period of the debt. The costs related to our line-of-credit arrangement are amortized over the term of the arrangement, regardless of whether there are any outstanding borrowings. Unamortized debt issuance costs are either recognized as a direct deduction from the carrying amount of the related debt or, if related to a line-of-credit facility, as an other noncurrent asset on the consolidated balance sheet. Product Warranty Provisions for product warranties are recognized at the time the underlying sale is recorded. The provision is based on historical experience as a percentage of sales adjusted for potential claims when a liability is probable and for known claims. Employee Benefit Plans Funded Status If the fair value of the plan assets exceeds the projected benefit obligation, the over-funded projected benefit obligation is recognized as an asset (prepaid pensions) on the consolidated balance sheet. Conversely, if the projected benefit obligation exceeds the fair value of the plan assets, the under-funded projected benefit obligation is recognized as a liability (employee benefit obligations) on the consolidated balance sheet. Gains and losses arising from the difference between actuarial assumptions and actual experience and unamortized prior service costs are recorded as a separate component of accumulated other comprehensive loss. Net Periodic Pension and Other Postretirement Costs Net periodic pension and other postretirement costs includes service cost, interest cost, expected rate of return on the market-related value of plan assets, amortization of prior service costs and recognized actuarial gains or losses. When actuarial gains or losses exceed 10% of the greater of the projected benefit obligation or the market-related value of plan assets, they are amortized to net periodic pension and other postretirement costs over the average remaining service period of the employees expected to receive benefits under the plan or over the remaining life expectancy of the employees expected to receive benefits if “all or almost all” of the plan’s participants are inactive. When actuarial gains or losses are less than 10% of the greater of the projected benefit obligation or the market-related value of plan assets, they are included in net periodic pension and other postretirement costs indirectly as a result of lower/higher interest costs arising from a decrease/increase in the projected benefit obligation. The market-related value of plan assets is determined using a five-year moving average which recognizes 20% of unrealized gains and losses each year. Other Comprehensive Income (Loss) Other comprehensive income (loss) includes changes in assets and liabilities from non-owner sources including foreign currency translation adjustments, unamortized prior service costs and unrecognized actuarial gains and losses associated with employee benefit plans, unrealized holding gains and losses on securities designated as available for sale, and changes in the fair value of derivatives designated and effective as cash flow hedges. Certain components of other comprehensive income (loss) are presented net of income tax. Foreign currency translation adjustments exclude the effect of income tax since earnings of non-U.S. subsidiaries are deemed to be reinvested for an indefinite period of time. Reclassification adjustments are amounts which are realized during the year and, accordingly, are deducted from other comprehensive income (loss) in the period in which they are included in net income (loss) or when a transaction no longer qualifies as a cash flow hedge. Foreign currency translation adjustments are included in net income (loss) upon sale or upon complete or substantially complete liquidation of an investment in a foreign entity. With respect to employee benefit plans, unamortized prior service costs are included in net income (loss), either immediately upon curtailment of the employee benefit plan or over the average remaining service period or life expectancy of the employees expected to receive benefits, and unrecognized actuarial gains and losses are included in net income (loss) indirectly as a result of lower/higher interest costs arising from a decrease/increase in the projected benefit obligation. Unrealized holding gains and losses on securities are included in net income (loss) when the underlying security is sold. Changes in the fair value of derivatives are included in net income (loss) when the projected sale occurs or, if a foreign currency purchase contract, over the estimated useful life of the underlying asset. Foreign Currency Translation Assets and liabilities of the Corporation’s foreign operations are translated at year-end exchange rates and the statements of operations are translated at the average exchange rates for the year. Gains or losses resulting from translating foreign currency financial statements are accumulated as a separate component of accumulated other comprehensive loss until the entity is sold or substantially liquidated. Revenue Recognition Revenue from sales is recognized when persuasive evidence of an arrangement exists, delivery has occurred, the sales price is fixed or determinable, and collectability is reasonably assured. Persuasive evidence of an arrangement identifies the final understanding between the parties as to the specific nature and terms of the agreed-upon transaction that creates enforceable obligations. It can be in the form of an executed purchase order from the customer, sales agreement issued by the Corporation or a similar arrangement deemed to be normal and customary business practice for that particular customer or class of customer (collectively, a sales agreement). Delivery and performance is considered to have occurred when the customer has taken title and assumed the risks and rewards of ownership of the product. Typically, this occurs when the product is shipped to the customer (i.e., FOB shipping point), delivered to the customer (i.e., FOB destination), or, for foreign sales, in accordance with trading guidelines known as Incoterms. Incoterms are standard trade definitions used in international contracts and are developed, maintained and promoted by the ICC Commission on Commercial Law and Practice. The sales price required to be paid by the customer is fixed or determinable from the sales agreement. It is not subject to refund or adjustment except for a variable-index surcharge provision which increases or decreases, as applicable, the selling price of a mill roll for corresponding changes in the published index cost of certain raw materials. The variable-index surcharge is recognized as revenue when the corresponding revenue for the inventory is recognized. Likelihood of collectability is assessed prior to acceptance of an order. There are no customer-acceptance provisions other than customer inspection and testing prior to shipment. Post-shipment obligations are insignificant. Amounts billed to the customer for shipping and handling are recorded within net sales and the related costs are recorded within costs of products sold (excluding depreciation and amortization). Amounts billed for taxes assessed by various government authorities (e.g., sales tax, value-added tax, etc.) are excluded from the determination of net income (loss) and instead are recorded as a liability until remitted to the government authority. Stock-Based Compensation Stock-based compensation, such as stock options, restricted stock units and performance shares, is recognized over the vesting period based upon the fair value of the award at the date of grant. For stock options, the fair value is determined by the Black Scholes option pricing model and is expensed over the vesting period of three years. For restricted stock units, the fair value is equal to the closing price of the Corporation’s common stock on the New York Stock Exchange (“NYSE”) on the date of grant and is expensed over the vesting period of three years. For performance share awards that vest subject to a performance condition, the fair value is equal to the closing price of the Corporation’s stock on the NYSE on the date of grant. For performance share awards that vest subject to a market condition, fair value is determined using a Monte Carlo simulation model. The fair value of performance share awards is expensed over the performance period when it is probable that the performance condition will be achieved. Derivative Instruments Derivative instruments which include forward exchange (for foreign currency sales and purchases) and futures contracts are recorded on the consolidated balance sheet as either an asset or a liability measured at their fair value. The accounting for changes in the fair value of a derivative depends on the use of the derivative. To the extent that a derivative is designated and effective as a cash flow hedge of an exposure to future changes in value, the change in the fair value of the derivative is deferred in accumulated other comprehensive loss. Any portion considered to be ineffective, including that arising from the unlikelihood of an anticipated transaction to occur, is reported as a component of earnings (other income/expense) immediately. Upon occurrence of the anticipated sale, the foreign currency sales contract designated and effective as a cash flow hedge is de-designated as a fair value hedge and the change in fair value previously deferred in accumulated other comprehensive loss is reclassified to earnings (net sales) with subsequent changes in fair value recorded as a component of earnings (other income/expense). Upon occurrence of the anticipated purchase, the foreign currency purchase contract is settled and the change in fair value deferred in accumulated other comprehensive loss is reclassified to earnings (depreciation and amortization expense) over the life of the underlying assets. Upon settlement of a futures contract, the change in fair value deferred in accumulated other comprehensive loss is reclassified to earnings (costs of products sold, excluding depreciation and amortization) when the corresponding inventory is sold and revenue is recognized. To the extent that a derivative is designated and effective as a hedge of an exposure to changes in fair value, the change in the derivative’s fair value will be offset in the statement of operations by the change in the fair value of the item being hedged and is recorded as a component of earnings (other income/expense). Cash flows associated with the derivative instruments are recorded as a component of operating activities on the consolidated statement of cash flows. The Corporation does not enter into derivative transactions for speculative purposes and, therefore, holds no derivative instruments for trading purposes. Fair Value Fair value is defined as the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants as of the measurement date. A hierarchy of inputs is used to determine fair value measurements with three levels. Level 1 inputs are quoted prices in active markets for identical assets or liabilities and are considered the most reliable evidence of fair value. Level 2 inputs are observable prices that are not quoted on active exchanges. Level 3 inputs are unobservable inputs used for measuring the fair value of assets or liabilities. Legal Costs Legal costs expected to be incurred in connection with loss contingencies are accrued when such costs are probable and estimable. Income Taxes On December 22, 2017, the U.S. federal government enacted the Tax Cuts and Jobs Act (the “Tax Reform”), to become effective January 1, 2018, which, among other things, imposed a one-time tax on deemed repatriated earnings of foreign subsidiaries. Accordingly, the tax impact of this deemed repatriation of previously untaxed foreign earnings was included within the U.S. taxable income for 2017, reducing the overall tax loss generated in the current year. Any future income earned in foreign subsidiaries will no longer be subject to U.S. tax under current U.S. law. Any remittance of future earnings to the U.S. will be subject to foreign withholding requirements; however, the Corporation estimates the impact of this would be insignificant. Income taxes are recognized during the year in which transactions enter into the determination of financial statement income. Deferred income tax assets and liabilities are recognized for the future tax consequences of temporary differences between the book carrying amount and the tax basis of assets and liabilities including net operating loss carryforwards. A valuation allowance is provided against a deferred income tax asset when it is “more likely than not” the asset will not be realized. Similarly, if a determination is made that it is “more likely than not” the deferred income tax asset will be realized, the related valuation allowance would be reduced and a benefit to earnings would be recorded. Penalties and interest are recognized as a component of the income tax provision. Tax benefits are recognized in the financial statements for tax positions taken or expected to be taken in a tax return when it is “more likely than not” that the tax authorities will sustain the tax position solely on the basis of the position’s technical merits. Consideration is given primarily to legislation and statutes, legislative intent, regulations, rulings and case law as well as their applicability to the facts and circumstances of the tax position when assessing the sustainability of the tax position. In the event a tax position no longer meets the “more likely than not” criteria, the tax benefit is reversed by recognizing a liability and recording a charge to earnings. Conversely, if a tax position subsequently meets the “more likely than not” criteria, a tax benefit would be recognized by reducing the liability and recording a credit to earnings. Earnings Per Common Share Basic earnings per common share is computed by dividing net income (loss) by the weighted average number of common shares outstanding for the period. The computation of diluted earnings per common share is similar to basic earnings per common share except that the denominator is increased to include the dilutive effect of the net additional common shares that would have been outstanding assuming exercise of outstanding stock awards, calculated using the treasury stock method. The computation of diluted earnings per share would not assume the exercise of an outstanding stock award if the effect on earnings per common share would be antidilutive. Similarly, the computation of diluted earnings per share would not assume the exercise of outstanding stock awards if the Corporation incurred a net loss since the effect on earnings per common share would be antidilutive. The weighted average number of common shares outstanding assuming exercise of dilutive stock awards was 12,330,401 for 2017, 11,951,181 for 2016 and 10,447,066 for 2015. Weighted-average outstanding stock awards excluded from the diluted earnings per common share calculation, since the effect would have been antidilutive, were 1,013,008 for 2017, 1,163,396 for 2016 and 1,138,287 for 2015. Recently Implemented Accounting Pronouncements In January 2018, the Financial Accounting Standards Board (“FASB”) issued ASU 2018-02, Income Statement – Reporting Comprehensive Income In March 2016, the FASB issued ASU 2016-09, Improvements to Employee Share-Based Payment Accounting In July 2015, the FASB issued ASU 2015-11, Simplifying the Measurement of Inventory Recently Issued Accounting Pronouncements In August 2017, the FASB issued ASU 2017-12, Derivatives and Hedging In May 2017, the FASB issued ASU 2017-09, Scope of Modification Accounting In March 2017, the FASB issued ASU 2017-07, Improving the Presentation of Net Periodic Pension Cost and Net Periodic Postretirement Benefit Cost In August 2016, the FASB issued ASU 2016-15, Classification of Certain Cash Receipts and Cash Payments In May 2016, April 2016, March 2016 and May 2014, the FASB issued ASUs 2016-12, 2016-10, 2016-08 and 2014-09, respectively, Revenue from Contracts with Customers (Topic 606) In February 2016, the FASB issued ASU 2016-02, Leases (Topic 842) In January 2016, the FASB issued ASU 2016-01, Recognition and Measurement of Financial Assets and Liabilities

Acquisitions

Acquisitions	12 Months Ended
	Dec. 31, 2017
Business Combinations [Abstract]
Acquisitions	NOTE 2 – ACQUISITIONS: Acquisition of Åkers On March 3, 2016, the Corporation acquired 100% of the voting equity interest of Åkers from Altor Fund II GP Limited. The purchase price approximated $74,155 and was comprised of $29,399 in cash, $22,619 in the form of three-year promissory notes (Note 8), and 1,776,604 shares of common stock of the Corporation which, based on the closing price of the Corporation’s common stock as of the date of closing, had a fair value of $22,137. The acquisition added roll production facilities in Sweden, the United States, Slovenia, and China; and a number of sales offices. It enabled cast roll production in the United States, forged roll production in Europe, and a low-cost product alternative for customers. Operating results of the acquired entities are included in the Forged and Cast Engineered Products segment from the date of acquisition. For the ten months ended December 31, 2016, net sales for Åkers approximated $121,079 and loss before income taxes, including the effects of purchase accounting, approximated $10,130. The fair value of assets acquired and liabilities assumed as of the date of acquisition is as follows: Current assets (excluding inventories) $ 41,703 Inventories 30,332 Property, plant and equipment 71,871 Intangible assets 11,784 Other noncurrent assets 8,068 Current liabilities (71,690 ) Noncurrent liabilities (43,153 ) Net assets acquired 48,915 Noncontrolling interest (2,019 ) Goodwill 27,259 Base purchase price $ 74,155 Goodwill is not amortized but is tested for impairment at the reporting unit level annually, as of October 1, or whenever events or changes in circumstances indicate the carrying amount may not be recoverable. Based on the first step of the two-step quantitative goodwill impairment test performed as of October 1, 2016, the Corporation determined that the carrying value of the Forged and Cast Engineered Products reporting unit was greater than its estimated fair value, and the second step of the two-step quantitative goodwill impairment test was performed to determine the amount of the impairment charge. As a result of the second step evaluation, the Corporation determined that the goodwill reported in the Forged and Cast Engineered Products reporting unit was fully impaired, primarily due to depressed market conditions and limitations inherent in its current market capitalization, and, accordingly, recorded a goodwill impairment charge of $26,261 for the year ended December 31, 2016. The goodwill impairment charge represents a full impairment and differs from the amount recognized as of the acquisition date due to changes in foreign currency exchange rates used to translate goodwill from the entities’ local currency to the U.S. dollar. Acquisition of ASW On November 1, 2016, the Corporation acquired 100% of the voting equity interest of ASW, a specialty steel producer, from CK Pearl Fund, Ltd., CK Pearl Fund L.P. and White Oak Strategic Master Fund, L.P. to support its diversification efforts in the open-die forging market. The purchase price of $13,116 consisted of $3,500 in cash and $9,616 in the assumption of outstanding indebtedness. The fair value of assets acquired and liabilities assumed as of the date of the acquisition is summarized below. Current assets (excluding inventories) $ 6,525 Inventories 6,956 Property, plant and equipment 10,310 Current liabilities (10,675 ) Outstanding indebtedness (9,616 ) Base purchase price $ 3,500 Operating results of ASW are included in the Forged and Cast Engineered Products segment from the date of acquisition. For the two months ended December 31, 2016, net sales for ASW approximated $7,523 and loss before income taxes approximated $1,781. Acquisition-Related Transaction Costs Acquisition-related transaction costs of $3,056 and $3,383 for the year ended December 31, 2016, and 2015, respectively, were incurred relating principally to the purchase of Åkers and ASW and are included in selling and administrative costs. Pro Forma Financial Information for the Åkers and ASW Acquisitions (unaudited) The following financial information presents the combination of the results of operations of Ampco, Åkers and ASW as though the acquisition date for both of the business combinations had occurred as of January 1, 2015. Pro forma adjustments have been made to (i) include the net incremental depreciation and amortization expense associated with recording property, plant and equipment and definite-lived intangible assets at fair value and (ii) remove debt-related expenses associated with previous debt facilities not assumed by the Corporation. The following pro forma financial information is presented for informational purposes only and is not necessarily indicative of the results of operations that would have been achieved had the acquisition occurred at the beginning of 2015: Year Ended December 31, 2016 2015 Net sales $ 393,243 $ 440,265 Loss before income taxes (includes noncontrolling interest) $ (63,498 ) $ (11,945 ) Net loss attributable to Ampco-Pittsburgh $ (85,778 ) $ (24,740 ) Net loss per common share (basic) attributable to Ampco-Pittsburgh $ (6.94 ) $ (2.03 ) Other Acquisition On July 29, 2015, the Corporation acquired the assets of AUP. The purchase price of $5,000 was funded by available cash. The pro forma impact on Corporation’s net sales and loss before income taxes was not significant to its consolidated results for 2015.

Investments in Joint Ventures

Investments in Joint Ventures	12 Months Ended
	Dec. 31, 2017
Equity Method Investments And Joint Ventures [Abstract]
Investments in Joint Ventures	NOTE 3 – INVESTMENTS IN JOINT VENTURES: The Corporation has interests in three joint ventures: • Shanxi Åkers TISCO Roll Co., Ltd. (“ATR”) – a cast roll joint venture in China for which the Corporation accounts using the consolidated method of accounting. ATR principally manufactures and sells cast mill rolls for the hot strip mill, steckel mill and medium plate mill. • Masteel Gongchang Roll Co., Ltd. (“MG”) – a forged roll joint venture in China for which, effective in 2017, the Corporation accounts using the cost method of accounting. MG principally manufactures and sells forged backup mill rolls for hot and cold strip mills. • Jiangsu Gongchang Roll Co., Ltd (“Gongchang”) – a cast roll joint venture in China for which the Corporation accounts using the cost method of accounting. Gongchang principally manufactures and sells cast mill rolls for hot and cold strip mills, medium/heavy section mills and plate mills. ATR In 2007, Åkers AB entered into an agreement with Taiyuan Iron & Steel Co., Ltd. (“TISCO”) to form ATR, with Åkers AB owning 59.88% and TISCO owning 40.12%. Since Åkers AB is the majority shareholder, has voting rights proportional to its ownership interest and exercises control over TISCO, Åkers AB is considered the primary beneficiary and, accordingly, accounts for its investment in ATR on the consolidated method of accounting. MG In 2007, a subsidiary of UES entered into an agreement with Maanshan Iron & Steel Company Limited (Maanshan) to form Union Electric Steel MG Roll Co., Ltd (“UES-MG”), with UES owning 49% and Maanshan owning 51%. Both companies contributed cash for their respective interests (which equated to $14,700 for UES). In November 2016, in connection with an equity restructuring of UES-MG, UES transferred 16% of its equity interest to Gongchang for $2,400, payable in installments over the next three years. As of December 31, 2017, UES received payments of $1,500. As part of the equity restructuring, the joint venture company was renamed Masteel Gongchang Roll Co., Ltd. (“MG”). The Corporation no longer participates in the management or daily operation of MG and has not guaranteed any of the obligations of the joint venture; accordingly, its maximum exposure of loss is limited to its remaining investment, which is recorded at cost, or approximately $835, at December 31, 2017. Dividends may be declared by the Board of Directors of the joint venture after allocation of after-tax profits to various “funds” equal to the minimum amount required under Chinese laws. No dividends were declared or received in 2017, 2016 or 2015. Gongchang The Corporation has a 24% interest in Gongchang which is recorded at cost, or $1,340. The Corporation does not participate in the management or daily operation of Gongchang, has not guaranteed any of its obligations and has no ongoing responsibilities to it. Dividends may be declared by the Board of Directors of the joint venture after allocation of after-tax profits to various “funds” equal to the minimum amount required under Chinese law. Approximately $395 of dividends were declared and received in 2016. No dividends were declared or received in 2017 or 2015.

Inventories

Inventories	12 Months Ended
	Dec. 31, 2017
Inventory Disclosure [Abstract]
Inventories	NOTE 4 – INVENTORIES: 2017 2016 Raw materials $ 24,249 $ 23,964 Work-in-progress 42,840 29,198 Finished goods 24,083 20,046 Supplies 16,389 10,371 Inventories $ 107,561 $ 83,579 At December 31, 2017, and 2016, approximately 42% and 45%, respectively, of the inventories were valued using the LIFO method. The LIFO reserve approximated $(16,063) and $(15,139) at December 31, 2017, and 2016, respectively. During each of the years, inventory quantities decreased for certain locations resulting in a liquidation of LIFO layers which were at lower costs. The effect of the liquidations was to decrease costs of products sold (excluding depreciation and amortization) by approximately $490, $936 and $216 for 2017, 2016 and 2015, respectively. There was no income tax expense recognized in the consolidated statements of operations for 2017 and 2016, due to the Corporation having a valuation allowance recorded against its deferred income tax assets for the jurisdiction where the income was recognized. See Note 15. Accordingly, the effect of the liquidations reduced net loss by approximately $490, or $0.04 per common share, for 2017, $936, or $0.08 per common share, for 2016, and increased net income by approximately $141, or $0.01 per common share, for 2015.

Property, Plant and Equipment

Property, Plant and Equipment	12 Months Ended
	Dec. 31, 2017
Property Plant And Equipment [Abstract]
Property, Plant and Equipment	NOTE 5 – PROPERTY, PLANT AND EQUIPMENT: 2017 2016 Land and land improvements $ 12,172 $ 11,747 Buildings 68,572 66,017 Machinery and equipment 340,396 323,684 Construction-in-process 5,019 2,595 Other 7,193 7,495 433,352 411,538 Accumulated depreciation (218,372 ) (197,130 ) Property, plant and equipment, net $ 214,980 $ 214,408 The majority of the assets of the Corporation, except real property including the land and building of UES-UK, is pledged as collateral for the Corporation’s revolving credit facility (see Note 8). Land and buildings of UES-UK, equal to approximately $2,831 (£2,098) at December 31, 2017, are held as collateral by the trustees of the UES-UK defined benefit pension plan (see Note 9). The gross value of assets under capital lease and the related accumulated amortization approximated $4,082 and $1,101, respectively, as of December 31, 2017, and $3,610 and $691, respectively, as of December 31, 2016.

Intangible Assets

Intangible Assets	12 Months Ended
	Dec. 31, 2017
Goodwill And Intangible Assets Disclosure [Abstract]
Intangible Assets	NOTE 6 – INTANGIBLE ASSETS: 2017 2016 Customer relationships $ 6,543 $ 6,244 Developed technology 4,429 4,248 Trade name 2,696 2,537 13,668 13,029 Accumulated amortization (2,647 ) (1,428 ) Intangible assets, net $ 11,021 $ 11,601 The following summarizes changes in intangible assets for the year ended December 31: 2017 2016 Balance at the beginning of the year $ 11,601 $ 1,193 Changes in intangible assets 0 11,784 Amortization of intangible assets (1,219 ) (1,106 ) Other, primarily impact from changes in foreign currency exchange rates 639 (270 ) Balance at the end of the year $ 11,021 $ 11,601 Intangible assets include an indefinite-lived trade name of $2,696 and $2,537 as of December 31, 2017, and 2016, respectively, that is not subject to amortization. Changes during the year ended December 31, 2016, primarily represent intangible assets identified as part of the Åkers acquisition. Identifiable intangible assets are expected to be amortized over a weighted average period of approximately 12 years or $1,248 for 2018, $1,248 for 2019, $1,248 for 2020, $541 for 2021, $400 for 2022 and $3,640 thereafter.

Other Current Liabilities

Other Current Liabilities	12 Months Ended
	Dec. 31, 2017
Other Liabilities Disclosure [Abstract]
Other Current Liabilities	NOTE 7 – OTHER CURRENT LIABILITIES: 2017 2016 Customer-related liabilities $ 18,512 $ 21,564 Accrued interest payable 2,697 2,274 Accrued sales commissions 2,301 1,693 Other 13,579 16,666 Other current liabilities $ 37,089 $ 42,197 Customer-related liabilities include liabilities for product warranty claims and deposits received on future orders. The following summarizes changes in the liability for product warranty claims for the year ended December 31: 2017 2016 2015 Balance at the beginning of the year $ 11,521 $ 6,358 $ 6,672 Acquisitions – opening balance sheet liability for warranty claims 0 7,130 0 Satisfaction of warranty claims (4,014 ) (4,297 ) (2,452 ) Provision for warranty claims 3,601 3,282 2,293 Other, primarily impact from changes in foreign currency exchange rates 594 (952 ) (155 ) Balance at the end of the year $ 11,702 $ 11,521 $ 6,358

Borrowing Arrangements

Borrowing Arrangements	12 Months Ended
	Dec. 31, 2017
Debt Disclosure [Abstract]
Borrowing Arrangements	NOTE 8 – BORROWING ARRANGEMENTS: In May 2016, the Corporation entered into a five-year Revolving Credit and Security Agreement (the “Credit Agreement”) with a syndicate of banks. The Credit Agreement provides for a senior secured asset-based revolving credit facility that replaced the Corporation’s previously existing line of credit and letter of credit facilities. The Credit Agreement provides for initial borrowings not to exceed $100,000 with an option to increase the credit facility by an additional $50,000 at the request of the Corporation and with the approval of the banks. The Corporation amended the Credit Agreement in 2016 to provide additional intercompany lending capacity to certain of its subsidiaries and expand available currencies for its letters of credits. The Credit Agreement was also amended in 2017 to add Åkers AB and ASW as borrowers and modify regional sublimits. As amended, the Credit Agreement includes sublimits for letters of credit not to exceed $40,000, European borrowings not to exceed $15,000, and Canadian borrowings not to exceed $15,000. Deferred financing fees of approximately $1,250 were incurred for the Credit Agreement and are being amortized over the life of the Credit Agreement. Availability under the Credit Agreement is based on eligible accounts receivable, inventory and fixed assets. Amounts outstanding under the credit facility bear interest at the Corporation’s option at either (i) LIBOR plus an applicable margin ranging between 1.25% to 1.75% based on the quarterly average excess availability or (ii) the base rate plus an applicable margin ranging between 0.25% to 0.75% based on the quarterly average excess availability. Additionally, the Corporation is required to pay a commitment fee ranging between 0.25% and 0.375% based on the daily unused portion of the credit facility. As of December 31, 2017, the Corporation had outstanding borrowings under the Credit Agreement of $20,349 (including £1,000 of European borrowings for its U.K. subsidiary). Interest accrued on the outstanding balance during the year at an average of approximately 2.75%. Additionally, the Corporation had utilized a portion of the credit facility for letters of credit (Note 10). As of December 31, 2017, remaining availability under the Credit Agreement approximated $56,000. No borrowings were outstanding under the Credit Agreement during 2016. The debt outstanding under the Credit Agreement is collateralized by a first priority perfected security interest in substantially all of the assets of the Corporation and its subsidiaries (other than real property). Additionally, the Credit Agreement 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, upstream distributions from subsidiaries, and acquisitions and divestures. The Corporation must also maintain a certain level of excess availability. If excess availability falls below the established threshold, or in an event of default, the Corporation will be required to maintain a minimum fixed charge coverage ratio of not less than 1.00 to 1.00. The Corporation was in compliance with the applicable bank covenants as of December 31, 2017. In March 2017, the Corporation repaid the debt assumed in connection with the acquisition of ASW (credit facility and term loan), including interest, fees and early termination costs. Accordingly, outstanding borrowings of the Corporation as of December 31, 2017, and 2016, consisted of the following: 2017 2016 Industrial Revenue Bonds $ 13,311 $ 13,311 Promissory notes (and interest) 25,395 23,844 Revolving Credit and Security Agreement 20,349 0 Minority shareholder loan 5,325 4,990 Credit facility 0 7,146 Term loan 0 762 Capital leases 1,773 2,161 Outstanding borrowings 66,153 52,214 Debt – current portion (19,335 ) (26,825 ) Long-term debt $ 46,818 $ 25,389 Future principal payments, assuming demand loans are called in 2018 and the Industrial Revenue Bonds are not able to be remarketed, are $19,335 for 2018, $25,844 for 2019, $344 for 2020, $20,585 for 2021 and $45 for 2022. The Corporation also had short-term lines of credit of approximately $800 (£250 in the United Kingdom and €400 in Belgium). No amounts were outstanding under these lines of credit as of December 31, 2017, and 2016. Industrial Revenue Bonds As of December 31, 2017, the Corporation had the following Industrial Revenue Bonds (IRBs) outstanding: (i) $4,120 tax-exempt IRB maturing in 2020, interest at a floating rate which averaged 0.91% during the current year; (ii) $7,116 taxable IRB maturing in 2027, interest at a floating rate which averaged 1.17% during the current year; and (iii) $2,075 tax-exempt IRB maturing in 2029, interest at a floating rate which averaged 0.79% during the current year. The IRBs are secured by letters of credit of equivalent amounts and are remarketed periodically at which time interest rates are reset. If the IRBs are not able to be remarketed, although considered remote by the Corporation and its bankers, the bondholders can seek reimbursement from the letters of credit which serve as collateral for the bonds. Promissory Notes In connection with the acquisition of Åkers, the Corporation issued three-year promissory notes amounting to $22,619. The notes bear interest at 6.5%, compounding annually, with principal and interest payable at maturity on March 3, 2019. As of December 31, 2017, accrued interest approximated $2,776, which is included in long-term debt on the consolidated balance sheet. Minority Shareholder Loan ATR has a $5,325 (RMB 34,655) loan outstanding with its minority shareholder. The loan originally matured in 2008 but has been renewed continually for one-year periods. Interest does not compound and has accrued on the outstanding balance, since inception, at the three-to-five-year loan interest rate set by the People’s Bank of China in effect at the time of renewal. The interest rate for 2017 approximated 5% and accrued interest as of December 31, 2017, approximated $2,682 (RMB 17,457), which is recorded in other current liabilities on the consolidated balance sheet. Capital Leases The Corporation leases equipment under various noncancelable lease agreements ending 2018 to 2022. Effective interest rates range between 1.30% and 5.20%.

Pension and Other Postretiremen

Pension and Other Postretirement Benefits	12 Months Ended
	Dec. 31, 2017
Compensation And Retirement Disclosure [Abstract]
Pension and Other Postretirement Benefits	NOTE 9 – PENSION AND OTHER POSTRETIREMENT BENEFITS: U.S. Pension Benefits Historically, the Corporation had one qualified domestic defined benefit pension plan (“legacy plan”). As part of the Åkers acquisition, the Corporation assumed the obligations for two additional U.S. plans (“Akers plans”). Collectively, the plans cover substantially all of its U.S. employees. During 2015 – 2017, the following amendments were made to the plans: • Effective December 31, 2017, the legacy plan and the Akers salary plan were merged. • Effective June 1, 2016, the Akers salary plan was amended to freeze benefit accruals and participation in the plan replacing benefit accruals with employer non-elective contributions equaling 3% of compensation to a defined contribution plan. The plan freeze resulted in remeasurement of the liability, reducing the liability by approximately $1,181 as of December 31, 2016, and a curtailment gain of $887 for the year ended December 31, 2016. • In 2016, the legacy plan was amended to permit lump sum distributions to inactive deferred vested participants and deferred beneficiaries who were not previously offered a lump sum, which approximated $2,739. • Effective July 1, 2015, the legacy plan was amended to freeze benefit accruals and participation in the plan for non-union hourly and salaried participants and, effective January 1, 2016, for employees of the Union Electric Steel Carnegie Steelworkers Location. Benefits under the legacy plan were replaced with employer contributions of a 3% non-elective base contribution and a matching contribution of up to 4% to a defined contribution plan. The plan changes resulted in curtailment losses of $1,303 for the year ended December 31, 2015. The U.S. defined benefit pension plans are covered by the Employee Retirement Income Security Act of 1974 (“ERISA”); accordingly, the Corporation’s policy is to fund at least the minimum actuarially computed annual contribution required under ERISA. No minimum contributions were required for any of the three years for the legacy plan or, since the date of acquisition, for the Akers plans. Minimum contributions for 2018 are expected to approximate $1,300. Estimated benefit payments for subsequent years are $13,672 for 2018, $14,091 for 2019, $14,301 for 2020, $14,566 for 2021, $14,685 for 2022 and $74,009 for 2023 – 2027. The fair value of the plan assets as of December 31, 2017, and 2016, approximated $199,138 and $188,722, respectively, in comparison to accumulated benefit obligations of $245,317 and $235,299 for the same periods. Employer contributions to the defined contribution plans totaled $2,588, $2,466 and $882 for 2017, 2016 and 2015, respectively, and are expected to approximate $2,808 in 2018. The Corporation also maintains nonqualified defined benefit pension plans for selected executives in addition to the benefits provided under the Corporation’s qualified defined benefit pension plan. The objectives of the nonqualified plans are to provide supplemental retirement benefits or restore benefits lost due to limitations set by the Internal Revenue Service. The assets of the nonqualified plans are held in a grantor tax trust known as a “Rabbi” trust and are subject to claims of the Corporation’s creditors, but otherwise must be used only for purposes of providing benefits under the plans. No contributions were made to the trust in 2015 – 2017 and none are expected in 2018. The fair market value of the trust at December 31, 2017, and 2016, which is included in other noncurrent assets, was $4,204 and $3,863, respectively. Changes in the fair market value of the trust are recorded as a component of other comprehensive income (loss). The plan is treated as a non-funded pension plan for financial reporting purposes. Accumulated benefit obligations approximated $7,202 and $6,639 at December 31, 2017, and 2016, respectively. Estimated benefit payments for subsequent years, which would represent employer contributions, are approximately $440 for 2018, $454 for 2019, $464 for 2020, $485 for 2021, $507 for 2022 and $2,570 for 2023 – 2027. Employees at one location participate in a multi-employer plan, I.A.M. National Pension Fund, I.A.M. National Pension Fund • More than 1,650 employer locations contribute to the plan • Approximately 100,000 active employees participate in the plan • Assets of approximately $11.7 billion and a funded status of approximately 96%. Less than 100 of the Corporation’s employees participate in the plan and contributions are based on a rate per hour. The Corporation’s contributions to the plan were less than $250 for each of 2017, 2016 and 2015, and represent less than five percent of total contributions to the plan by all contributing employers. Contributions are expected to approximate $250 in 2018. Foreign Pension Benefits Employees of UES-UK participate in a defined benefit pension plan that was curtailed effective December 31, 2004, and replaced with a defined contribution pension plan. The UES-UK plans are non-U.S. plans and therefore are not covered by ERISA. Instead, the Trustees and UES-UK have agreed to a recovery plan that estimates the amount of employer contributions, based on U.K. regulations, necessary to eliminate the funding deficit of the plan with such estimates subject to change based on the future investment performance of the plan’s assets. The U.S. dollar equivalent of employer contributions to the defined benefit pension plan approximated $1,521, $1,522 and $1,715 in 2017, 2016 and 2015, respectively, and are expected to approximate $850 in 2018 at which time the plan is expected to be fully funded. The fair value of the plan’s assets as of December 31, 2017, and 2016, approximated $56,419 (£41,820) and $48,055 (£38,955), respectively, in comparison to accumulated benefit obligations of $57,540 (£42,650) and $61,277 (£49,673) for the same periods. Estimated benefit payments for subsequent years are $1,644 for 2018, $1,903 for 2019, $1,768 for 2020, $1,738 for 2021, $1,670 for 2022 and $11,196 for 2023 – 2027. Contributions to the defined contribution pension plan approximated $311, $252 and $382 in 2017, 2016 and 2015, respectively, and are expected to approximate $379 in 2018. As part of the Åkers acquisition, the Corporation assumed the obligations of two foreign defined benefit pension plans. The plans are unfunded. Projected benefit obligations approximated $7,073 and $5,633 at December 31, 2017, and 2016, respectively; accumulated benefit obligations approximated the same. Estimated benefit payments for subsequent years, for both plans combined, are $234 for 2018, $257 for 2019, $248 for 2020, $249 for 2021, $240 for 2022 and $1,379 for 2023 – 2027. Other Postretirement Benefits The Corporation provides a monthly reimbursement of postretirement health care benefits for a 5-year period principally to the bargaining groups of one subsidiary (“legacy OPEB plan”). The legacy OPEB plan covers participants and their spouses and/or dependents who retire under the existing pension plan on other than a deferred vested basis and at the time of retirement have also rendered 15 or more years of continuous service irrespective of age. Retiree life insurance is provided to substantially all retirees. The Corporation also provides life insurance and health care benefits to former employees of certain discontinued operations. This obligation had been estimated and provided for at the time of disposal. As part of the Åkers acquisition, the Corporation assumed the obligations for two additional postretirement benefit plans (“Akers OPEB plans”). The Akers OPEB plans cover retiree medical and life insurance benefits. In August 2016, the Corporation modified the Akers OPEB plans whereby retiree health benefits for certain groups of pre-Medicare eligible employees were replaced with a monthly stipend. The plan changes resulted in a reduction in prior service costs decreasing plan liabilities by approximately $4,762, which is being amortized against other postretirement benefit costs over the expected remaining service periods of approximately 7.5 and 12 years, versus recognized immediately. As of December 31, 2017, the Akers OPEB plans were merged. The Corporation’s postretirement health care and life insurance plans are not funded or subject to any minimum regulatory funding requirements. Estimated benefit payments for subsequent years, which would represent employer contributions, for the legacy and Akers OPEB plans are approximately $1,383 for 2018, $1,407 for 2019, $1,429 for 2020, $1,239 for 2021, $1,201 for 2022 and $5,363 for 2023-2027. Reconciliations The following provides a reconciliation of projected benefit obligations (“PBO”), plan assets and the funded status of the plans for the Corporation’s defined benefit plans calculated using a measurement date as of the end of the respective years. U.S. Pension Benefits (a) Foreign Pension Benefits Other Postretirement Benefits 2017 2016 2017 2016 2017 2016 Change in projected benefit obligations: PBO at January 1 $ 244,440 $ 181,803 $ 66,910 $ 63,750 $ 19,059 $ 8,117 Åkers acquisition – PBO at March 3 0 68,081 0 5,393 0 17,467 Service cost 1,651 1,714 150 314 492 504 Interest cost 8,413 9,977 1,845 2,250 571 722 Plan amendments 0 0 0 0 165 (4,762 ) Plan settlements (b) 0 (2,739 ) 0 0 0 0 Plan curtailments 0 (1,181 ) 0 0 0 0 Foreign currency exchange rate changes 0 0 5,948 (11,477 ) 0 0 Actuarial loss (gain) 13,825 (160 ) (7,954 ) 8,869 (2,170 ) (1,598 ) Participant contributions 0 0 0 0 92 80 Benefits paid from plan assets (12,950 ) (12,679 ) (1,813 ) (2,189 ) 0 0 Benefits paid by the Corporation (403 ) (376 ) (473 ) 0 (1,230 ) (1,471 ) PBO at December 31 $ 254,976 $ 244,440 $ 64,613 $ 66,910 $ 16,979 $ 19,059 Change in plan assets: Fair value of plan assets at January 1 $ 188,722 $ 139,376 $ 48,055 $ 49,628 $ 0 $ 0 Åkers acquisition – fair value of plan assets at March 3 0 50,108 0 0 0 0 Actual return on plan assets 23,366 14,656 3,998 7,859 0 0 Foreign currency exchange rate changes 0 0 4,673 (8,930 ) 0 0 Corporate contributions 403 376 1,979 1,687 1,138 1,391 Participant contributions 0 0 0 0 92 80 Plan settlements (b) 0 (2,739 ) 0 0 0 0 Gross benefits paid (13,353 ) (13,055 ) (2,286 ) (2,189 ) (1,230 ) (1,471 ) Fair value of plan assets at December 31 $ 199,138 $ 188,722 $ 56,419 $ 48,055 $ 0 $ 0 Funded status of the plans: Fair value of plan assets $ 199,138 $ 188,722 $ 56,419 $ 48,055 $ 0 $ 0 Less benefit obligations 254,976 244,440 64,613 66,910 16,979 19,059 Funded status at December 31 $ (55,838 ) $ (55,718 ) $ (8,194 ) $ (18,855 ) $ (16,979 ) $ (19,059 ) (a) Includes the nonqualified defined benefit pension plan. (b) Represents lump sum payments. The following provides a summary of amounts recognized in the consolidated balance sheets. U.S. Pension Benefits Foreign Pension Benefits Other Postretirement Benefits 2017 2016 2017 2016 2017 2016 Employee benefit obligations: Accrued payrolls and employee benefits (a) $ (432 ) $ (409 ) $ 0 $ 0 $ (1,371 ) $ (1,276 ) Employee benefit obligations (b) (55,406 ) (55,309 ) (8,194 ) (18,855 ) (15,608 ) (17,783 ) $ (55,838 ) $ (55,718 ) $ (8,194 ) $ (18,855 ) $ (16,979 ) $ (19,059 ) Accumulated other comprehensive loss: (c) Net actuarial loss (gain) $ 47,252 $ 48,153 $ 25,914 $ 25,547 $ (1,211 ) $ 936 Prior service cost (credit) 156 209 (9,174 ) 0 (13,809 ) (15,581 ) $ 47,408 $ 48,362 $ 16,740 $ 25,547 $ (15,020 ) $ (14,645 ) (a) Recorded as a current liability in the consolidated balance sheet. (b) Recorded as a noncurrent liability in the consolidated balance sheet. (c) Amounts are pre-tax. Amounts included in accumulated other comprehensive loss as of December 31, 2017, expected to be recognized in net periodic pension and other postretirement costs in 2018 include: U.S. Pension Benefits Foreign Pension Benefits Other Postretirement Benefits Net actuarial loss (gain) $ 1,763 $ 784 $ (109 ) Prior service cost (credit) 52 (324 ) (1,607 ) $ 1,815 $ 460 $ (1,716 ) Investment Policies and Strategies The investment policies and strategies are determined and monitored by the Board of Directors for the U.S. pension plans and by the Trustees (as appointed by UES-UK and the employees of UES-UK) for the UES-UK pension plan, each of whom employ their own investment managers to manage the plan’s assets in accordance with the policy guidelines. The foreign pension plans of Åkers are unfunded. In 2017, the U.S defined benefit pension plans adopted a glide-path strategy whereby target asset allocations are rebalanced based on projected payment obligations and the funded status of the plans. Pension assets of the UES-UK plan are invested with the objective of maximizing long-term returns while minimizing material losses to meet future benefit obligations as they become due. Investments in equity securities are primarily in common stocks of publicly traded U.S. and international companies across a broad spectrum of industry sectors. Investments in fixed-income securities are principally A-rated or better bonds with maturities of less than ten years, preferred stocks and convertible bonds. The Corporation believes there are no significant concentrations of risk associated with the Plans’ assets. Attempts to minimize risk include allowing temporary changes to the allocation mix in response to market conditions, diversifying investments among asset categories (e.g., equity securities, fixed-income securities, alternative investments, cash and cash equivalents) and within these asset categories (e.g., economic sector, industry, geographic distribution, size) and consulting with independent financial and legal counsels to assure that the investments and their expected returns and risks are consistent with the goals of the Board of Directors or Trustees. With respect to the U.S. pension plans, the following investments are prohibited unless otherwise approved by the Board of Directors: stock of the Corporation, futures and options except for hedging purposes, unregistered or restricted stock, warrants, margin trading, short-selling, real estate excluding public or real estate partnerships, and commodities including art, jewelry and gold. The foreign pension plan invests in specific funds. Any investments other than those specifically identified would be considered prohibited. The following summarizes target asset allocations (within +/-5% considered acceptable) and major asset categories. Certain investments are classified differently for target asset allocation purposes and external reporting purposes. Adoption of the glide-path strategy in 2017 did not result in any significant changes to the target asset allocations. In December 2016, the Corporation changed investment managers for the legacy plan; accordingly, there was temporarily a higher amount in cash and cash equivalents. U.S. Pension Benefits Foreign Pension Benefits Target Allocation Percentage of Plan Assets Target Allocation Percentage of Plan Assets Dec. 31, 2017 2017 2016 Dec. 31, 2017 2017 2016 Equity Securities 60 % 58 % 47 % 44 % 49 % 48 % Fixed-Income Securities 20 % 21 % 21 % 35 % 33 % 34 % Alternative Investments 15 % 16 % 8 % 21 % 17 % 18 % Other (primarily cash and cash equivalents) 5 % 5 % 24 % 0 % 1 % 0 % Fair Value Measurement of Plan Assets Equity securities, exchange-traded funds and mutual funds are actively traded on exchanges and price quotes for these investments are readily available. Similarly, fixed-income mutual funds consist of debt securities of U.S. and U.K. corporations and price quotes for these investments are readily available. Commingled funds are not traded publicly, but the underlying assets (such as stocks and bonds) held in these funds are traded on active markets and the prices for the underlying assets are readily observable. For securities not actively traded, the fair value may be based on third-party appraisals, discounted cash flow analysis, benchmark yields and inputs that are currently observable in markets for similar securities. Investment Strategies The significant investment strategies of the various funds are summarized below. Fund Investment Strategy Primary Investment Objective Temporary Investment Funds Invests primarily in a diversified portfolio of investment grade money market instruments. Achieve a market level of current income while maintaining stability of principal and liquidity. Various Equity Funds Each fund maintains a diversified holding in common stock of applicable companies (e.g., common stock of small capitalization companies if a small-cap fund, common stock of medium capitalization companies if a mid-cap fund, common stock of foreign corporations if an international fund, etc.). Outperform the fund’s related index. Various Fixed Income Funds Invests primarily in a diversified portfolio of fixed-income securities of varying maturities or in commingled funds which invest in a diversified portfolio of fixed-income securities of varying maturities. For the U.S. Plans – to achieve a rate of return that matches or exceeds the expected growth in plan liabilities. For the Foreign Plan – to outperform the applicable FTSE index over a prescribed period. Alternative Investments – Managed Funds Invests in equities and equity-like asset classes and strategies (such as public equities, venture capital, private equity, real estate, natural resources and Generate a minimum annual inflation adjusted return of 5% and outperform a traditional 70/30 equities/bond portfolio. Alternative Investments – Hedge and Absolute Return Funds Invests in a diversified portfolio of alternative investment styles and strategies. Generate long-term capital appreciation while maintaining a low correlation with the traditional global financial markets. Categories of Plan Assets Asset categories based on the nature and risks of the U.S. Pension Benefit Plans’ assets as of December 31, 2017, are summarized below. Quoted Prices in Active Markets for Identical Inputs (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) Total Equity Securities: U.S. Consumer discretionary $ 637 $ 0 $ 0 $ 637 Consumer staples 896 0 0 896 Energy 427 0 0 427 Financial 1,362 0 0 1,362 Healthcare 1,192 0 0 1,192 Industrials 819 0 0 819 Information technology 2,061 0 0 2,061 Materials 248 0 0 248 Mutual funds 91,258 0 0 91,258 Telecommunications 198 0 0 198 Utilities 204 0 0 204 Total Equity Securities 99,302 0 0 99,302 Fixed Income Securities: Corporate bonds 0 10,801 0 10,801 Mutual funds 18,884 0 0 18,884 Treasury bonds 6,976 0 0 6,976 Agency bonds 0 926 0 926 Total Fixed Income Securities 25,860 11,727 0 37,587 Alternative Investments: Managed funds (a) 0 0 49,838 49,838 Total Alternative Investments 0 0 49,838 49,838 Other: Cash and cash equivalents (b) 11,012 0 0 11,012 Commingled funds 0 174 0 174 Other (c) 2 0 1,223 1,225 Total Other 11,014 174 1,223 12,411 $ 136,176 $ 11,901 $ 51,061 $ 199,138 (a) Includes approximately 47.3% in equity and equity-like asset securities, 41.1% in alternative investments (real assets, commodities and resources, absolute return funds) and 9.6% in fixed income securities and 2.0% in other, primarily cash and cash equivalents. (b) Includes investments in temporary funds. (c) Includes accrued receivables and pending broker settlements. Categories of Plan Assets Asset categories based on the nature and risks of the U.S. Pension Benefit Plans’ assets as of December 31, 2016, are summarized below. Quoted Prices in Active Markets for Identical Inputs (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) Total Equity Securities: U.S. Bank & financial services $ 631 $ 0 $ 0 $ 631 Capital goods 75 0 0 75 Chemicals 20 0 0 20 Commercial services 16 0 0 16 Electronics 67 0 0 67 Health care 201 0 0 201 Mutual funds 72,571 0 0 72,571 Oil & gas 87 0 0 87 Retail 101 0 0 101 Technology 188 0 0 188 Transportation 18 0 0 18 Wholesale distribution 16 0 0 16 Other (represents 8 business sectors) 211 0 0 211 International Chemicals 7 0 0 7 Technology 6 0 0 6 Total Equity Securities 74,215 0 0 74,215 Fixed Income Securities: Mutual funds 36,601 0 0 36,601 Total Fixed Income Securities 36,601 0 0 36,601 Alternative Investments: Managed funds (a) 0 0 33,830 33,830 Total Alternative Investments 0 0 33,830 33,830 Other: Cash and cash equivalents (b) 27,902 0 0 27,902 Commingled funds 0 154 0 154 Other (c) 16,020 0 0 16,020 Total Other 43,922 154 0 44,076 $ 154,738 $ 154 $ 33,830 $ 188,722 (a) Includes approximately 45.9% in equity and equity-like asset securities, 44.5% in alternative investments (real assets, commodities and resources, absolute return funds) and 7.4% in fixed income securities and 2.2% in other, primarily cash and cash equivalents. (b) Includes investments in temporary funds. (c) Includes accrued receivables and pending broker settlements. Asset categories based on the nature and risks of the Foreign Pension Benefit Plan’s assets as of December 31, 2017, are summarized below. Quoted Prices in Active Markets for Identical Inputs (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) Total Equity Securities: Commingled Funds (U.K.) $ 0 $ 4,617 $ 0 $ 4,617 Commingled Funds (International) 0 23,015 0 23,015 Total Equity Securities 0 27,632 0 27,632 Fixed-Income Securities: Commingled Funds (U.K.) 0 18,851 0 18,851 Alternative Investments: Hedge and Absolute Return Funds 0 0 9,637 9,637 Cash and cash equivalents 299 0 0 299 $ 299 $ 46,483 $ 9,637 $ 56,419 Asset categories based on the nature and risks of the Foreign Pension Benefit Plan’s assets as of December 31, 2016, are summarized below. Quoted Prices in Active Markets for Identical Inputs (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) Total Equity Securities: Commingled Funds (U.K.) $ 0 $ 3,716 $ 0 $ 3,716 Commingled Funds (International) 0 19,146 0 19,146 Total Equity Securities 0 22,862 0 22,862 Fixed-Income Securities: Commingled Funds (U.K.) 0 16,426 0 16,426 Alternative Investments: Hedge and Absolute Return Funds 0 0 8,593 8,593 Cash and cash equivalents 174 0 0 174 $ 174 $ 39,288 $ 8,593 $ 48,055 The table below sets forth a summary of changes in the fair value of the Level 3 plan assets for U.S. and foreign pension plans for the year ended December 31, 2017. Alternative Investments U.S. Pension Benefits Foreign Pension Benefits Fair value as of January 1, 2017 $ 33,830 $ 8,593 Contributions 16,000 0 Withdrawals (5,364 ) 0 Realized gains 1,304 0 Change in net unrealized gains 4,068 229 Other, primarily impact from changes in foreign currency exchange rates 0 815 Fair value as of December 31, 2017 $ 49,838 $ 9,637 The table below sets forth a summary of changes in the fair value of the Level 3 plan assets for U.S. and foreign pension plans for the year ended December 31, 2016. Alternative Investments U.S. Pension Benefits Foreign Pension Benefits Fair value as of January 1, 2016 $ 4,967 $ 32,210 $ 10,571 Withdrawals (4,967 ) 0 0 Realized gains 0 1,857 0 Change in net unrealized losses 0 (237 ) (280 ) Other, primarily impact from changes in foreign currency exchange rates 0 0 (1,698 ) Fair value as of December 31, 2016 $ 0 $ 33,830 $ 8,593 Net Periodic Pension and Other Postretirement Benefit Costs The actual return on the fair value of plan assets is included in determining the funded status of the plans. In determining net periodic pension costs, the expected long-term rate of return on the market-related value of plan assets is used. Differences between the actual return on plan assets and the expected long-term rate of return on plan assets are classified as part of unrecognized actuarial gains or losses and are recorded as a component of accumulated other comprehensive loss on the consolidated balance sheet. When these gains or losses exceed 10% of the greater of the projected benefit obligation or the market-related value of plan assets, they are amortized to net periodic pension and other postretirement costs over the average remaining service period or life expectancy of the employees expected to receive benefits under the plans. When the gains or losses are less than 10% of the greater of the projected benefit obligation or the market-related value of plan assets, they are included in net periodic pension and other postretirement costs indirectly as a result of lower/higher interest costs arising from a decrease/increase in the projected benefit obligation. Net periodic pension and other postretirement benefit costs include the following components for the year ended December 31: U.S. Pension Benefits Foreign Pension Benefits Other Postretirement Benefits 2017 2016 2015 2017 2016 2015 2017 2016 2015 Service cost $ 1,651 $ 1,714 $ 2,743 $ 150 $ 314 $ 0 $ 492 $ 504 $ 384 Interest cost 8,413 9,977 7,990 1,845 2,250 2,394 571 722 474 Expected return on plan assets (12,503 ) (13,424 ) (10,996 ) (2,239 ) (2,461 ) (2,681 ) 0 0 0 Amortization of: Prior service cost (credit) 52 44 371 0 0 0 (1,607 ) (1,277 ) (672 ) Actuarial loss (gain) 4,111 3,324 5,440 751 670 845 (24 ) 36 26 Curtailment (gain) loss 0 (887 ) 1,303 0 0 0 0 0 0 $ 1,724 $ 748 $ 6,851 $ 507 $ 773 $ 558 $ (568 ) $ (15 ) $ 212 Assumptions Assumptions are reviewed on an annual basis. The expected long-term rate of return on plan assets is an estimate of average rates of earnings expected to be earned on funds invested or to be invested to provide for the benefits included in the projected benefit obligation. Since these benefits will be paid over many years, the expected long-term rate of return is reflective of current investment returns and investment returns over a longer period. Consideration is also given to target and actual asset allocations, inflation and real risk-free return. The discount rates used in determining future pension obligations and other postretirement benefits for each of the plans are based on rates of return on high-quality fixed-income investments currently available and expected to be available during the period to maturity of the pension and other postretirement benefits. High-quality fixed-income investments are defined as those investments which have received one of the two highest ratings given by a recognized rating agency with maturities of 10+ years. The discount rates and weighted-average wage increases used to determine the benefit obligations as of December 31, 2017, and 2016, are summarized below. U.S. Pension Benefits Foreign Pension Benefits Other Postretirement Benefits 2017 2016 2017 2016 2017 2016 Discount rate 3.63-3.72% 4.02-4.25% 2.45% 2.50-2.65% 3.46-3.69% 3.90-4.13% Wage increases 3.00% 3.00% n/a n/a n/a n/a In addition, the assumed health care cost trend rate at December 31, 2017, for other postretirement benefits is 6% for 2018 gradually decreasing to 4.75% in 2020. In selecting rates for current and long-term health care assumptions, the Corporation considers known health care cost increases, the design of the benefit programs, the demographics of its active and retiree populations and expectations of inflation rates in the future. A one percentage point increase or decrease in the assumed health care cost trend rate would result in an inconsequential change to the postretirement benefit obligation at December 31, 2017, and the annual benefit expense for 2017. The following assumptions were used to determine net periodic pension and other postretirement benefit costs for the year ended December 31: U.S. Pension Benefits Foreign Pension Benefits Other Postretirement Benefits 2017 2016 2015 2017 2016 2015 2017 2016 2015 Discount rate 4.02-4.25% 4.20-4.40% 4.00-4.10% 2.50-2.65% 3.00-3.65% 3.50% 3.90-4.13% 3.80-4.20% 4.00% Expected long-term rate of return 6.95-7.50% 6.90-7.75% 8.00% 4.45% 5.40% 5.40% n/a n/a n/a Wages increases 3.00% 3.00% 4.00% n/a n/a n/a n/a n/a n/a

Commitments and Contingent Liab

Commitments and Contingent Liabilities	12 Months Ended
	Dec. 31, 2017
Commitments And Contingencies Disclosure [Abstract]
Commitments and Contingent Liabilities	NOTE 10 – COMMITMENTS AND CONTINGENT LIABILITIES: Outstanding standby and commercial letters of credit as of December 31, 2017, approximated $22,576, the majority of which serves as collateral for the IRB debt. In addition, in connection with the acquisition of Åkers, the Corporation issued two surety bonds to PRI Pensionsgaranti, guaranteeing certain obligations of Åkers Sweden AB and Åkers AB under a credit insurance policy relating to pension commitments. The total amount covered by the surety bonds is approximately $4,000 (SEK 33,900). Approximately 39% of the Corporation’s employees are covered by collective bargaining agreements. Of the nine bargaining agreements, one of the agreements, representing approximately 19% of the covered employees, expired in 2017; however, employees continue to work under the expired agreement while negotiations proceed. The remaining agreements have expiration dates ranging from May 2018 to September 2020. Collective bargaining agreements expiring in 2018 (representing approximately 54% of the covered employees) will be negotiated with the intent to secure mutually beneficial, long-term arrangements. See Note 13 regarding derivative instruments, Note 19 regarding litigation and Note 20 for environmental matters.

Stock-Based Compensation

Stock-Based Compensation	12 Months Ended
	Dec. 31, 2017
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Stock-Based Compensation	NOTE 11 – STOCK-BASED COMPENSATION: In May 2016, the shareholders of the Corporation approved the adoption of the Ampco-Pittsburgh Corporation 2016 Omnibus Incentive Plan (the “Incentive Plan”), which authorizes the issuance of up to 1,100,000 shares of the Corporation’s common stock for awards under the Incentive Plan. The Incentive Plan replaces the 2011 Omnibus Incentive Plan (the “Predecessor Plan”). No new awards will be granted under the Predecessor Plan. Any awards outstanding under the Predecessor Plan will remain subject to and be paid under the Predecessor Plan, and any shares subject to outstanding awards under the Predecessor Plan that subsequently expire, terminate, or are surrendered or forfeited for any reason without issuance of shares (equal to 84,667 shares at December 31, 2017) will automatically become available for issuance under the Incentive Plan. Awards under the Incentive Plan may include incentive 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 shares, or if 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 all or a portion of the director’s retainer for board service. The number of shares of common stock issued to non-employee directors was 50,000, 32,090 and 14,310 in 2017, 2016 and 2015, respectively. The Compensation Committee has granted time-vesting restricted stock units (RSUs) and performance-vesting restricted stock units (PSUs) to select individuals. Each RSU represents the right to receive one share of common stock of the Corporation at a future date after the RSU has become earned and vested, subject to the terms and conditions of the RSU award agreement. The RSUs vest over a three-year period. The PSUs can be earned depending upon the achievement of a performance or market condition and a time-vesting condition as follows: The grant date fair value for the RSUs equals the closing price of the Corporation’s common stock on the NYSE on the date of grant. The grant date fair value for PSUs subject to a market condition is determined using a Monte Carlo simulation model and the grant date fair value for PSUs that vest subject to a performance condition is equal to the closing price of the Corporation’s stock on the NYSE on the date of grant. The determination of the fair value of these awards takes into consideration the likelihood of achievement of the market or performance condition and is adjusted for subsequent changes in the estimated or actual outcome of the condition. Unrecognized compensation expense associated with the RSUs and PSUs equaled $2,551 at December 31, 2017, and is expected to be recognized over a weighted average period of approximately 2 years. A summary of outstanding and exercisable incentive options (RSUs and PSUs) as of December 31, 2017, and activity for the year ended December 31, 2017, is as follows: Number of RSUs Weighted Average Fair Value Number of PSUs Weighted Average Fair Value Outstanding at January 1, 2017 155,845 $ 17.53 39,348 $ 21.62 Granted 76,473 14.00 97,788 14.93 Converted to common stock (58,677 ) 17.25 0 N/A Forfeited/cancelled (14,935 ) 16.76 (34,622 ) 14.99 Outstanding at December 31, 2017 158,706 $ 16.00 102,514 $ 17.47 A summary of outstanding and exercisable stock options as of December 31, 2017, and activity for the year ended December 31, 2017, is as follows: Number of Shares Under Options Weighted Average Exercise Price Remaining Contractual Life In Years Intrinsic Value Outstanding at January 1, 2017 1,005,836 $ 24.07 4.2 $ 0 Granted 0 N/A Exercised 0 N/A Forfeited (190,501 ) 26.03 Outstanding at December 31, 2017 815,335 $ 23.61 3.3 $ 0 Exercisable at December 31, 2017 815,335 $ 23.61 3.3 $ 0 Vested or expected to vest at December 31, 2017 815,335 $ 23.61 3.3 $ 0 Stock-based compensation expense for all awards, including expense for shares to be issued to non-employee directors, approximated $2,400, $2,332 and $1,328 for 2017, 2016 and 2015, respectively. There was no income tax benefit recognized in the consolidated statements of operations for 2017 and 2016, due to the Corporation having a valuation allowance recorded against its deferred income tax assets for the jurisdiction where the expense was recognized. See Note 15. The related income tax benefit recognized in the consolidated statements of operations for 2015 approximated $465.

Accumulated Other Comprehensive

Accumulated Other Comprehensive Loss	12 Months Ended
	Dec. 31, 2017
Equity [Abstract]
Accumulated Other Comprehensive Loss	NOTE 12 – ACCUMULATED OTHER COMPREHENSIVE LOSS: Net change and ending balances for the various components of other comprehensive income (loss) and for accumulated other comprehensive loss as of and for the year ended December 31, 2015, 2016 and 2017 are summarized below. Foreign Currency Translation Adjustments Unrecognized Components of Employee Benefit Plans Unrealized Holding Gains on Securities Derivatives Accumulated Other Comprehensive Loss Balance at January 1, 2015 $ (4,426 ) $ (65,396 ) $ 984 $ 85 $ (68,753 ) Net Change (3,967 ) 15,453 (292 ) (40 ) 11,154 Balance at December 31, 2015 (8,393 ) (49,943 ) 692 45 (57,599 ) Net Change (14,580 ) 11,307 (633 ) 506 (3,400 ) Balance at December 31, 2016 (22,973 ) (38,636 ) 59 551 (60,999 ) Net Change 11,041 10,582 573 134 22,330 Impact from adoption of ASU 2018-02 (Note 15) 0 (6,142 ) 0 54 (6,088 ) Balance at December 31, 2017 $ (11,932 ) $ (34,196 ) $ 632 $ 739 $ (44,757 ) The following summarizes the line items affected on the consolidated statements of operations for components reclassified from accumulated other comprehensive loss for each of the years ended December 31. Amounts in parentheses represent credits to net income (loss). 2017 2016 2015 Amortization of unrecognized employee benefit costs: Costs of products sold (excluding depreciation and amortization) $ 1,934 $ 2,463 $ 3,604 Selling and administrative 1,148 (719 ) 3,354 Other expense 201 166 355 Total before income tax 3,283 1,910 7,313 Income tax provision 0 0 (2,573 ) Net of income tax $ 3,283 $ 1,910 $ 4,740 Realized gains on sale of marketable securities: Selling and administrative $ (29 ) $ (1,404 ) $ (82 ) Income tax provision 0 366 29 Net of income tax $ (29 ) $ (1,038 ) $ (53 ) Realized gains/losses from settlement of cash flow hedges: Net sales (foreign currency sales contracts) $ 0 $ (6 ) $ (17 ) Depreciation and amortization (foreign currency purchase contracts) (31 ) (27 ) (27 ) Costs of products sold (excluding depreciation and amortization) (futures contracts – copper and aluminum) (639 ) 220 751 Total before income tax (670 ) 187 707 Income tax provision 0 (79 ) (272 ) Net of income tax $ (670 ) $ 108 $ 435 The income tax expense (benefit) associated with the various components of other comprehensive income (loss) for each of the years ended December 31 is summarized below. For 2017 and 2016, there was no income tax benefit for certain items due to the Corporation having a valuation allowance recorded against its deferred income tax assets for the jurisdiction where the expense is recognized. See Note 15. 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. 2017 2016 2015 Income tax expense (benefit) associated with changes in: Unrecognized employee benefit costs $ 0 $ 0 $ (4,731 ) Unrealized holding losses on marketable securities 0 0 134 Fair value of cash flow hedges 0 0 294 Income tax expense (benefit) associated with reclassification adjustments: Amortization of unrecognized employee benefit costs 0 0 (2,573 ) Realized gains from sale of marketable securities 0 366 29 Realized losses from settlement of cash flow hedges 0 (79 ) (272 )

Derivative Instruments

Derivative Instruments	12 Months Ended
	Dec. 31, 2017
Derivative Instruments And Hedging Activities Disclosure [Abstract]
Derivative Instruments	NOTE 13 – DERIVATIVE INSTRUMENTS: Certain operations of the Corporation are subject to risk from exchange rate fluctuations in connection with sales in foreign currencies. To minimize this risk, foreign currency sales contracts are entered into which are designated as cash flow or fair value hedges. As of December 31, 2017, approximately $27,414 of anticipated foreign-denominated sales has been hedged which are covered by fair value contracts settling at various dates through January 2019. The fair value of assets held as collateral for the fair value contracts as of December 31, 2017, approximated $2,025, including a $1,350 standby letter of credit. Additionally, certain divisions of the Air and Liquid Processing 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 December 31, 2017, approximately 51% or $2,637 of anticipated copper purchases over the next year and 56% or $524, of anticipated aluminum purchases over the next six months are hedged. 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. As of December 31, 2010, all contracts had been settled and the underlying fixed assets were placed in service. No portion of the existing cash flow or fair value 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. At December 31, 2017, the Corporation has purchase commitments covering 62% or $1,285 of anticipated natural gas usage for 2018 for one of its subsidiaries. The commitments qualify as normal purchases and, accordingly, are not reflected on the consolidated balance sheet. Purchases of natural gas under previously existing commitments approximated $856, $1,936 and $2,452 for 2017, 2016 and 2015, respectively. The Corporation does not enter into derivative transactions for speculative purposes and, therefore, holds no derivative instruments for trading purposes. The following summarizes location and fair value of the foreign currency sales contracts recorded on the consolidated balance sheets as of December 31: Location 2017 2016 Fair value hedge contracts Other current assets $ 961 $ 214 Other noncurrent assets 0 2 Other current liabilities 89 940 Other noncurrent liabilities 1 35 Fair value hedged item Receivables (269 ) 121 Other current assets 169 808 Other noncurrent assets 16 45 Other current liabilities 907 233 Other noncurrent liabilities 0 5 The change in the fair value of the cash flow contracts is recorded as a component of accumulated other comprehensive loss. Amounts recognized as and reclassified from accumulated other comprehensive loss are recorded as a component of other comprehensive income (loss) and are summarized below. Amounts are after-tax, where applicable. Certain amounts recognized as comprehensive income (loss) for 2017 and 2016 have no tax effect due to the Corporation recording a valuation allowance against its deferred income tax assets in the related jurisdictions. See Note 15. For the Year Ended December 31, 2017 Accumulated Other Comprehensive Income (Loss) Beginning of the Year Plus Recognized as Comprehensive Income (Loss) Less Gain (Loss) Reclassified from Accumulated Other Comprehensive Loss Accumulated Other Comprehensive Income (Loss) End of the Year Foreign currency sales contracts – cash flow hedges $ 0 $ 0 $ 0 $ 0 Foreign currency purchase contracts 216 0 31 185 Future contracts – copper and aluminum 335 804 639 500 Change in fair value $ 551 $ 804 $ 670 $ 685 For the Year Ended December 31, 2016 Foreign currency sales contracts – cash flow hedges $ 4 $ 0 $ 4 $ 0 Foreign currency purchase contracts 241 0 25 216 Future contracts – copper and aluminum (200 ) 398 (137 ) 335 Change in fair value $ 45 $ 398 $ (108 ) $ 551 For the Year Ended December 31, 2015 Foreign currency sales contracts – cash flow hedges $ 0 $ 14 $ 10 $ 4 Foreign currency purchase contracts 258 0 17 241 Future contracts – copper and aluminum (173 ) (489 ) (462 ) (200 ) Change in fair value $ 85 $ (475 ) $ (435 ) $ 45 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) in Statements Estimated to be Reclassified in the Next Year Ended December 31, of Operations 12 Months 2017 2016 2015 Foreign currency sales contracts – cash flow hedges Net sales $ 0 $ 0 $ 6 $ 17 Foreign currency purchase contracts Depreciation and amortization 27 31 27 27 Futures contracts – copper and aluminum Costs of products sold (excluding depreciation and amortization) 500 639 (220 ) (751 ) Losses on foreign exchange transactions included in other expense approximated $(463), $(1,161) and $(324) for 2017, 2016 and 2015, respectively.

Fair Value

Fair Value	12 Months Ended
	Dec. 31, 2017
Fair Value Disclosures [Abstract]
Fair Value	NOTE 14 – FAIR VALUE: The following summarizes financial assets and liabilities reported at fair value on a recurring basis in the accompanying consolidated balance sheets at December 31: 2017 Quoted Prices in Active Markets for Identical Inputs (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) Total Investments Other noncurrent assets $ 4,204 $ 0 $ 0 $ 4,204 Foreign currency exchange contracts Other current assets 0 1,130 0 1,130 Other noncurrent assets 0 16 0 16 Other current liabilities 0 996 0 996 Other noncurrent liabilities 0 1 0 1 2016 Investments Other noncurrent assets $ 3,863 $ 0 $ 0 $ 3,863 Foreign currency exchange contracts Other current assets 0 1,022 0 1,022 Other noncurrent assets 0 47 0 47 Other current liabilities 0 1,173 0 1,173 Other noncurrent liabilities 0 40 0 40 The investments held as other noncurrent assets represent assets held in the “Rabbi” trust for the purpose of providing benefits under the 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 foreign currency exchange contracts is determined based on the fair value of similar contracts with similar terms and remaining maturities. The fair value of futures contracts is based on market quotations. The fair value of the variable-rate debt approximates its carrying value. Additionally, the fair value of trade receivables and trade payables approximates their carrying value.

Income Taxes

Income Taxes	12 Months Ended
	Dec. 31, 2017
Income Tax Disclosure [Abstract]
Income Taxes	NOTE 15 – INCOME TAXES: On December 22, 2017, the U.S. federal government enacted the Tax Reform, to become effective as of January 1, 2018, which, among other things, lowered the U.S. corporate statutory income tax rate from 35% to 21%, implemented a modified territorial tax system and imposed a one-time tax on deemed repatriated earnings of foreign subsidiaries. The Tax Reform negatively impacted the Corporation’s income tax provision by approximately $1,565, principally related to the one-time repatriation transition tax offset by income tax benefits resulting from 100% bonus depreciation. There was no cash outlay due to the Tax Reform, however, it reduced the amount of the Corporation’s carryback refund that it would have been able to receive. Additionally, there was no significant impact from remeasuring its U.S. deferred income tax assets and liabilities at the new enacted statutory income tax rate since these net deferred income tax assets are fully valued. The Corporation will continue to analyze the Tax Reform and refine its provisional amounts, which could potentially impact the measurement of its tax balances. In response to the enacted Tax Reform, Staff Accounting Bulletin No. 118 (SAB 118) was issued to address the application of U.S. Generally Accepted Accounting Principles in situations when a registrant does not have the necessary information available, prepared, or analyzed (including computations) in reasonable detail to complete the accounting for certain income tax effects of the Tax Reform. As of December 31, 2017, in accordance with SAB 118, the Corporation has made a reasonable estimate of the: (i) one-time repatriation transition tax; (ii) increased bonus depreciation for assets placed in service on or after September 27, 2017; and (iii) effects on the Corporation’s existing deferred tax balances, but has not completed its full accounting for the tax effects of enactment of the Tax Reform. The Corporation anticipates U.S. regulatory agencies will issue further regulations during 2018, which may alter this estimate. The Corporation is continuing to analyze its earnings and profits in foreign jurisdictions and its deferred tax balances. In January 2018, the FASB released guidance on the accounting for tax on the global intangible low-taxed income (“GILTI”) provisions of the Tax Reform. The GILTI provisions impose a tax on foreign income in excess of a deemed return on tangible assets of foreign corporations. The guidance indicates that either accounting for deferred taxes related to GILTI inclusions or to treating any taxes on GILTI inclusions as period cost are both acceptable methods, subject to an accounting policy election. The Corporation is still evaluating the GILTI provisions and has not yet elected an accounting policy for GILTI. The final determination of the tax effects of enactment of the Tax Reform will be completed within the measurement period of up to one year from the enactment date as permitted by SAB 118, and any adjustments to provisional amounts that are identified during the measurement period will be recorded in the reporting period in which the adjustment is determined. Furthermore, the Corporation adopted ASU 2018-02, which allows for a reclassification from accumulated other comprehensive income (loss) to retained earnings for the stranded tax effects resulting from the Tax Reform. A stranded tax effect is defined as the difference in the tax effect of amounts recognized as other comprehensive income (loss) items, using the income tax rate in effect at the time of recognition and the newly enacted income tax rate. The new guidance is relevant only to the reclassification of the income tax effects of the Tax Reform; accordingly, the underlying guidance that requires that the effect of a change in tax laws or rates be included in income from continuing operations is not affected. As a result, $6,088 was reclassified between accumulated other comprehensive loss and retained earnings. (Loss) income before income taxes and equity gains (losses) in joint venture is comprised of the following: 2017 2016 2015 Domestic $ (16,988 ) $ (26,326 ) $ 6,000 Foreign 3,295 (31,194 ) (1,480 ) (Loss) income before income taxes and equity gains (losses) in joint venture $ (13,693 ) $ (57,520 ) $ 4,520 At December 31, 2017, the Corporation has federal net operating loss carryforwards of $3,208, which begin to expire in 2035. Under the Tax Reform, beginning with 2018, net operating losses can be carried forward indefinitely, but are limited to 80 percent of taxable income in any given year. Additionally, at December 31, 2017, the Corporation had state net operating loss carryforwards of $34,495 which begin to expire in 2018, foreign net operating loss carryforwards of $93,364 which begin to expire in 2018 and capital loss carryforwards of $814 which do not expire. During 2017, the Corporation received $6,540 of U.S. federal and state income tax refunds. The income tax (benefit) provision consisted of the following: 2017 2016 2015 Current: Federal $ (4,698 ) $ (1,574 ) $ 4,577 State (440 ) 465 378 Foreign 606 414 (20 ) Current income tax (benefit) provision (4,532 ) (695 ) 4,935 Deferred: Federal 1,259 (2,688 ) (2,203 ) State (112 ) (1,838 ) 197 Foreign 1,876 (2,472 ) (296 ) Increase in valuation allowance 154 30,405 0 Deferred income tax provision (benefit) 3,177 23,407 (2,302 ) Total income tax (benefit) provision $ (1,355 ) $ 22,712 $ 2,633 In 2016, the income tax provision was affected by recognition of a valuation allowance against all U.S. and certain foreign entities as it was considered more-likely-than-not that the net deferred income tax assets would not be realized. The Corporation assessed available positive and negative evidence to estimate whether sufficient future taxable income would be generated to permit use of the existing deferred income tax assets. During 2016, the Corporation incurred three years of cumulative losses, inclusive of the acquired Åkers businesses as if the businesses were held during the entire three-year period. Such objective evidence limits the ability to consider other subjective evidence, such as projections for future growth and profitability. On the basis of this evaluation, the Corporation established an increase in the valuation allowance to recognize the estimated portion of deferred income tax assets that is more-likely-than-not to not be realized. The Corporation has evaluated this position in the current year and determined that the valuation allowance against U.S. and certain foreign entities should remain. The decrease in the valuation allowance during 2017 is primarily due to the reduction in the U.S. corporate statutory income tax rate from 35% to 21%. The difference between statutory U.S. federal income tax and the Corporation’s effective income tax was as follows: 2017 2016 2015 Computed at statutory rate $ (4,428 ) $ (19,984 ) $ 1,402 Tax differential on non-U.S. earnings (389 ) 1,790 106 State income taxes (398 ) (1,535 ) 226 Manufacturers deduction (I.R.C. Section 199) 0 204 (433 ) Meals and entertainment 142 143 136 Tax credits 0 0 (243 ) Goodwill impairment 0 9,191 0 Increase in valuation allowance 154 30,405 0 Repatriation transition tax impact 3,284 0 0 Change in tax rates 0 1,913 224 Change in uncertain tax positions 0 114 91 Acquisition-related costs 0 571 981 Other – net 280 (100 ) 143 Total income tax (benefit) provision $ (1,355 ) $ 22,712 $ 2,633 Deferred income tax assets and liabilities as of December 31, 2017, and 2016, are summarized below. Unremitted earnings of the Corporation’s non-U.S. subsidiaries and affiliates are deemed to be permanently reinvested and, accordingly, no deferred income tax liability has been recorded. If the Corporation were to remit any foreign earnings to the U.S., the estimated tax impact would be insignificant. 2017 2016 Assets: Employment – related liabilities $ 10,975 $ 18,659 Pension liability – foreign 1,633 2,241 Pension liability – domestic 9,004 16,133 Liabilities related to discontinued operations 186 241 Capital loss carryforwards 308 282 Asbestos-related liability 12,179 21,024 Net operating loss – domestic 674 653 Net operating loss – state 2,782 2,123 Net operating loss – foreign 22,856 19,106 Inventory related 2,764 2,157 Impairment charge associated with investment in MG 1,155 2,184 Investment tax credits – foreign 848 791 Other 3,181 6,660 Gross deferred income tax assets 68,545 92,254 Valuation allowance (1) (38,112 ) (45,449 ) 30,433 46,805 Liabilities: Depreciation (26,915 ) (37,584 ) Mark-to-market adjustment – derivatives (4 ) (187 ) Intangible assets – definite life (1,186 ) (2,067 ) Intangible assets – indefinite life (605 ) (731 ) Other (566 ) (2,003 ) Gross deferred income tax liabilities (29,276 ) (42,572 ) Net deferred income tax assets $ 1,157 $ 4,233 (1) The decrease in the valuation allowance in 2017 from 2016 is primarily due to the reduction in the U.S. corporate statutory income tax rate from 35% to 21%. The following summarizes changes in unrecognized tax benefits for the year ended December 31: 2017 2016 2015 Balance at the beginning of the year $ 236 $ 315 $ 52 Gross increases for tax positions taken in the current year 0 0 0 Gross increases for tax positions taken in prior years 0 0 283 Gross decreases in tax positions due to lapse in statute of limitations (119 ) (79 ) (20 ) Gross decreases for tax positions taken in prior years 0 0 0 Gross decreases for tax settlements with taxing authorities 0 0 0 Balance at the end of the year $ 117 $ 236 $ 315 If the unrecognized tax benefits were recognized, $31 would reduce the Corporation’s effective income tax rate. The amount of penalties and interest recognized in the consolidated balance sheets as of December 31, 2017, and 2016, and in the consolidated statements of operations for 2017, 2016 and 2015 is insignificant. Unrecognized tax benefits of $117 are to reverse due to the lapse in the statute of limitations within the next 12 months. The Corporation is subject to taxation in the United States, various states and foreign jurisdictions, and remains subject to examination by tax authorities for tax years 2014 – 2017. The Corporation is currently under audit by the Internal Revenue Service of its consolidated federal tax returns for the 2014 – 2016 tax years. Additionally, the Pennsylvania Department of Revenue has notified the Corporation’s subsidiary, Union Electric Steel, that it will audit its state income tax returns for the years 2015 and 2016. No material changes are anticipated.

Operating Leases

Operating Leases	12 Months Ended
	Dec. 31, 2017
Leases [Abstract]
Operating Leases	NOTE 16 – OPERATING LEASES: The Corporation leases certain factory and office space and certain equipment. Operating lease expense was $1,283 in 2017, $1,148 in 2016 and $1,043 in 2015. Operating lease payments for subsequent years are $702 for 2018, $628 for 2019, $524 for 2020, $486 for 2021, $476 for 2022 and $902 thereafter.

Research and Development Costs

Research and Development Costs	12 Months Ended
	Dec. 31, 2017
Research And Development [Abstract]
Research and Development Costs	NOTE 17 – RESEARCH AND DEVELOPMENT COSTS: Expenditures relating to the development of new products, identification of products or process alternatives and modifications and improvements to existing products and processes are expensed as incurred. These expenses approximated $3,386 for 2017, $2,716 for 2016 and $1,137 for 2015.

Related Parties

Related Parties	12 Months Ended
	Dec. 31, 2017
Related Party Transactions [Abstract]
Related Parties	NOTE 18 – RELATED PARTIES: ATR has a $5,325 (RMB 34,655) loan outstanding with its minority shareholder. The loan originally matured in 2008 but has been renewed continually for one year periods. Interest does not compound and has accrued on the outstanding balance, since inception, at the three-to-five-year loan interest rate set by the People’s Bank of China in effect at the time of renewal. The interest rate for 2017 approximated 5%. Accrued interest approximated $2,682 (RMB 17,457) and $2,265 (RMB 15,730) as of December 31, 2017, and 2016, respectively, which is recorded in other current liabilities on the consolidated balance sheet. Purchases from ATR’s minority shareholder and its affiliates, which were in the ordinary course of business, approximated $7,752 (RMB 52,418) and $6,362 (RMB 42,403) in 2017 and 2016, respectively. Excluding the loan and interest outstanding, the amount payable to ATR’s minority shareholder and its affiliates approximated $296 (RMB 1,929) and $899 (RMB 6,237) at December 31, 2017, and 2016, respectively. Sales to ATR’s minority shareholder and its affiliates, which were in the ordinary course of business, approximated $8,564 (RMB 57,909) and $5,922 (RMB 39,468) for 2017 and 2016, respectively. No amounts were due from ATR’s minority shareholder or its affiliates as of December 31, 2017, or 2016.

Litigation

Litigation	12 Months Ended
	Dec. 31, 2017
Text Block [Abstract]
Litigation	NOTE 19 – LITIGATION: The Corporation and its subsidiaries are involved in various claims and lawsuits incidental to their businesses and are also subject to asbestos litigation as described below. In February 2017, the Corporation, its indirect subsidiary Akers National Roll Company, as well as the Akers National Roll Company Health & Welfare Benefits Plan were named as defendants in a class action complaint filed in the United States District Court for the Western District of Pennsylvania, where the plaintiffs (currently retired former employees of Akers National Roll Company and the United Steel, Paper and Forestry, Rubber, Manufacturing, Energy, Allied Industrial, and Service Workers International Union, AFL-CIO) alleged that the defendants breached collective bargaining agreements and violated the benefit plan by modifying medical benefits of the plaintiffs and similarly situated retirees. The defendants moved to dismiss the case, and plaintiffs petitioned the court to compel arbitration. On June 13, 2017, the District Court compelled arbitration and denied the defendants’ motion to dismiss as moot. Defendants appealed this decision to the Third Circuit Court of Appeals on June 21, 2017. Defendants also filed a motion to stay arbitration pending the resolution of the appeal, and that motion was granted on September 5, 2017. The Third Circuit Court of Appeals will next consider whether the District Court erred in compelling arbitration. While no assurance can be given as to the ultimate outcome of this matter, the Corporation believes that the final resolution of this action will not have a material adverse effect on our results of operations, financial position, liquidity or capital resources. 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 (“Asbestos Liability”). Air & Liquid, and in some cases the Corporation, are defendants (among a number of defendants, often in excess of 50) in cases filed in various state and federal courts. Asbestos Claims The following table reflects approximate information about the claims for Asbestos Liability against Air & Liquid and the Corporation for the two years ended December 31, 2017, and 2016: 2017 2016 Total claims pending at the beginning of the period 6,618 6,212 New claims served 1,365 1,452 Claims dismissed (718 ) (782 ) Claims settled (358 ) (264 ) Total claims pending at the end of the period (1) 6,907 6,618 Gross settlement and defense costs (in 000’s) $ 21,431 $ 17,960 Average gross settlement and defense costs per claim resolved (in 000’s) $ 19.92 $ 17.17 (1) Included as “open claims” are approximately 479 and 444 claims in 2017 and 2016, respectively, classified in various jurisdictions as “inactive” or transferred to a state or federal judicial panel on multi-district litigation, commonly referred to as the MDL. A substantial majority of the settlement and defense costs reflected in the above table was 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. Asbestos Insurance The Corporation and Air & Liquid are parties to a series of settlement agreements (“Settlement Agreements”) with insurers that have coverage obligations for Asbestos Liability (the “Settling Insurers”). 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 Asbestos Liability. The Settlement Agreements encompass the substantial majority of insurance policies that provide coverage for claims for Asbestos Liability. The Settlement Agreements include acknowledgements that Howden North America, Inc. (“Howden”) is entitled to coverage under policies covering Asbestos Liability for claims arising out of the historical products manufactured or distributed by Buffalo Forge, a former subsidiary of the Corporation (the “Products”). The Settlement Agreements do not provide for any prioritization on access to the applicable policies or any sublimits 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 a Product. 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 Asbestos Liability. Asbestos Valuations In 2006, the Corporation retained Hamilton, Rabinovitz & Associates, Inc. (“HR&A”), a nationally recognized expert in the valuation of asbestos liabilities, to assist the Corporation in estimating the potential liability for pending and unasserted future claims for Asbestos Liability. Based on this analysis, the Corporation recorded a reserve for Asbestos Liability claims pending or projected to be asserted through 2013 as of December 31, 2006. HR&A’s analysis has been periodically updated since that time. Most recently, the HR&A analysis was updated in 2016, and additional reserves were established by the Corporation as of December 31, 2016, for Asbestos Liability claims pending or projected to be asserted through 2026. The methodology used by HR&A in its projection in 2016 of the operating subsidiaries’ liability for pending and unasserted potential future claims for Asbestos Liability, which is substantially the same as the methodology employed by HR&A in prior estimates, relied upon and included the following factors: • HR&A’s interpretation of a widely accepted forecast of the population likely to have been exposed to asbestos; • epidemiological studies estimating the number of people likely to develop asbestos-related diseases; • HR&A’s analysis of the number of people likely to file an asbestos-related injury claim against the subsidiaries and the Corporation based on such epidemiological data and relevant claims history from January 1, 2014, to September 9, 2016; • an analysis of pending cases, by type of injury claimed and jurisdiction where the claim is filed; • an analysis of claims resolution history from January 1, 2014, to September 9, 2016, to determine the average settlement value of claims, by type of injury claimed and jurisdiction of filing; and • an adjustment for inflation in the future average settlement value of claims, at an annual inflation rate based on the Congressional Budget Office’s ten year forecast of inflation. Using this information, HR&A estimated in 2016 the number of future claims for Asbestos Liability that would be filed through the year 2026, as well as the settlement or indemnity costs that would be incurred to resolve both pending and future unasserted claims through 2026. This methodology has been accepted by numerous courts. In conjunction with developing the aggregate liability estimate referenced above, the Corporation also developed an estimate of probable insurance recoveries for its Asbestos Liabilities. In developing the estimate, the Corporation considered HR&A’s projection for settlement or indemnity costs for Asbestos Liability and management’s projection of associated defense costs (based on the current defense to indemnity cost ratio), as well as a number of additional factors. These additional factors included the Settlement Agreements then in effect, policy exclusions, policy limits, policy provisions regarding coverage for defense costs, attachment points, prior impairment of policies and gaps in the coverage, policy exhaustions, insolvencies among certain of the insurance carriers, and the nature of the underlying claims for Asbestos Liability asserted against the subsidiaries and the Corporation as reflected in the Corporation’s asbestos claims database, as well as estimated erosion of insurance limits on account of claims against Howden arising out of the Products. In addition to consulting with the Corporation’s outside legal counsel on these insurance matters, the Corporation consulted with a nationally recognized insurance consulting firm it retained to assist the Corporation with certain policy allocation matters that also are among the several factors considered by the Corporation when analyzing potential recoveries from relevant historical insurance for Asbestos Liabilities. Based upon all of the factors considered by the Corporation, and taking into account the Corporation’s analysis of publicly available information regarding the credit-worthiness of various insurers, the Corporation estimated the probable insurance recoveries for Asbestos Liability and defense costs through 2026. Although the Corporation believes that the assumptions employed in the insurance valuation were reasonable and previously consulted with its outside legal counsel and insurance consultant regarding those assumptions, there are other assumptions that could have been employed that would have resulted in materially lower insurance recovery projections. Based on the analyses described above, the Corporation’s reserve at December 31, 2016, for the total costs, including defense costs, for Asbestos Liability claims pending or projected to be asserted through 2026, was $171,181 of which approximately 70% was attributable to settlement costs for unasserted claims projected to be filed through 2026 and future defense costs. The reserve at December 31, 2017, was $149,750. While it is reasonably possible that the Corporation will incur additional charges for Asbestos Liability and defense costs in excess of the amounts currently reserved, the Corporation believes that there is too much uncertainty to provide for reasonable estimation of the number of future claims, the nature of such claims and the cost to resolve them beyond 2026. Accordingly, no reserve has been recorded for any costs that may be incurred after 2026. The Corporation’s receivable at December 31, 2016, for insurance recoveries attributable to the claims for which the Corporation’s Asbestos Liability reserve has been established, including the portion of incurred defense costs covered by the Settlement Agreements in effect through December 31, 2016, and the probable payments and reimbursements relating to the estimated indemnity and defense costs for pending and unasserted future Asbestos Liability claims, was $115,945 ($100,342 at December 31, 2017). The following table summarizes activity relating to insurance recoveries for each of the years ended December 31, 2017, and 2016. 2017 2016 Insurance receivable – asbestos, beginning of the year $ 115,945 $ 125,423 Settlement and defense costs paid by insurance carriers (1) (15,603 ) (23,138 ) Changes in estimated coverage 0 13,660 Insurance receivable – asbestos, end of the year $ 100,342 $ 115,945 (1) Settlement and defense costs paid by insurance carriers for 2016 includes a lump sum cash settlement with an insurance carrier of $9,808. The insurance receivable recorded by the Corporation does not assume any recovery from insolvent carriers and 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, that there will not be further insolvencies among the relevant insurance carriers, or that the assumed percentage recoveries for certain carriers will prove correct. The difference between insurance recoveries and projected costs is not due to exhaustion of all insurance coverage for Asbestos Liability. The Corporation and the subsidiaries have substantial additional insurance coverage which the Corporation expects to be available for Asbestos Liability claims and defense costs that the subsidiaries and it may incur after 2026. However, this insurance coverage also can be expected to have gaps creating significant shortfalls of insurance recoveries against claims expense, which could be material in future years. The amounts recorded by the Corporation for Asbestos Liabilities and insurance receivables rely on assumptions that are 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 HR&A’s calculations vary significantly from actual results. Key variables in these assumptions are identified above and include the number and type of new claims to be filed each year, the average cost of disposing of each such new claim, average annual defense costs, compliance by relevant parties with the terms of the Settlement Agreements, the resolution of remaining coverage issues with insurance carriers, and the solvency risk with respect to the relevant insurance carriers. Other factors that may affect the Corporation’s Asbestos Liability and ability to recover under its 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 evaluate its estimated Asbestos Liability and related insurance receivables as well as 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, these regular reviews may result in the Corporation incurring future charges; however, the Corporation is currently unable to estimate such future charges. Adjustments, if any, to the Corporation’s estimate of its recorded Asbestos Liability and/or insurance receivables could be material to operating results for the periods in which the adjustments to the liability or receivable are recorded, and to the Corporation’s liquidity and consolidated financial position.

Environmental Matters

Environmental Matters	12 Months Ended
	Dec. 31, 2017
Environmental Remediation Obligations [Abstract]
Environmental Matters	NOTE 20 – 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. In the opinion of management, the potential liability for remedial actions and environmental compliance measures of approximately $440 at December 31, 2017, is considered adequate based on information known to date.

Business Segments

Business Segments	12 Months Ended
	Dec. 31, 2017
Segment Reporting [Abstract]
Business Segments	NOTE 21 – BUSINESS SEGMENTS: The Corporation organizes its business into two operating segments—Forged and Cast Engineered Products and Air and Liquid Processing. Summarized financial information concerning the Corporation’s reportable segments is shown in the following tables. Corporate assets included under Identifiable Assets represent primarily cash and cash equivalents and other items not allocated to reportable segments. Long-lived assets exclude deferred income tax assets. Corporate costs are comprised of operating costs of the corporate office and other costs not allocated to the segments. The segment information for the Forged and Cast Engineered Products includes information for Åkers and ASW beginning as of December 31, 2016, and from their respective dates of acquisition. The accounting policies are the same as those described in Note 1. Net Sales (Loss) Income Before Income Taxes and Equity Gains (Losses) in Joint Venture 2017 2016 2015 2017 2016 2015 Forged and Cast Engineered Products (1) $ 344,529 $ 247,652 $ 152,267 $ (1,826 ) $ (42,878 ) $ (3,444 ) Air and Liquid Processing (1) 87,872 84,214 86,213 10,427 5,123 23,166 Total Reportable Segments 432,401 331,866 238,480 8,601 (37,755 ) 19,722 Corporate costs, including other income (expense) 0 0 0 (22,294 ) (19,765 ) (15,202 ) Consolidated total $ 432,401 $ 331,866 $ 238,480 $ (13,693 ) $ (57,520 ) $ 4,520 Capital Expenditures Depreciation and Amortization Expense Identifiable Assets (2) 2017 2016 2015 2017 2016 2015 2017 2016 2015 Forged and Cast Engineered Products $ 14,165 $ 9,440 $ 8,608 $ 21,124 $ 19,166 $ 10,468 $ 414,227 $ 348,331 $ 228,718 Air and Liquid Processing 560 385 494 1,072 1,183 1,262 132,341 173,017 183,024 Corporate 174 741 305 191 114 57 19,031 44,541 94,414 $ 14,899 $ 10,566 $ 9,407 $ 22,387 $ 20,463 $ 11,787 $ 565,599 $ 565,889 $ 506,156 Net Sales (3) Long-Lived Assets (4) (Loss) Income Before Income Taxes and Equity Gains (Losses) in Joint Venture Geographic Areas: 2017 2016 2015 2017 2016 2015 2017 2016 2015 United States $ 236,856 $ 159,531 $ 126,417 $ 235,646 $ 206,460 $ 236,707 $ (18,122 ) $ (25,906 ) $ 5,855 Foreign 195,545 172,335 112,063 88,116 133,141 29,198 $ 4,429 (31,614 ) (1,335 ) $ 432,401 $ 331,866 $ 238,480 $ 323,762 $ 339,601 $ 265,905 $ (13,693 ) $ (57,520 ) $ 4,520 Net Sales by Product Line (5) 2017 2016 2015 Forged and cast mill rolls $ 254,638 $ 230,531 $ 129,499 Forged engineered products 89,891 17,121 22,768 Heat exchange coils 28,998 28,139 32,745 Centrifugal pumps 35,607 36,359 33,120 Air handling systems 23,267 19,716 20,348 $ 432,401 $ 331,866 $ 238,480 (1) (Loss) income before income taxes and equity gains (losses) in joint venture for the Forged and Cast Engineered Products segment for 2016 includes a pre-tax charge of $26,676 principally for the write-off of goodwill associated with the Forged and Cast Engineered Products reporting unit deemed to be impaired. (Loss) income before income taxes and equity gains (losses) in joint venture for the Air and Liquid Processing segment for 2016 includes pre-tax charge of $4,565 for estimated costs of asbestos-related litigation through 2026 net of estimated insurance recoveries and a settlement with an insurance carrier for an amount greater than originally estimated, and 2015 includes pre-tax asbestos-related proceeds of $14,333 received from two insurance carriers in rehabilitation. (2) Identifiable assets for the Forged and Cast Engineered Products segment include investments in joint ventures of $2,175, $2,019 and $3,097 at December 31, 2017, 2016 and 2015, respectively. The change in the identifiable assets of the Air and Liquid Processing segment relates primarily to the movement in asbestos-related insurance receivables, the balances of which equaled $100,342, $115,945 and $125,423 at December 31, 2017, 2016 and 2015, respectively. (3) Net sales are attributed to countries based on location of the customer. Sales to individual countries were less than 10% of consolidated net sales each of the years. (4) Foreign long-lived assets represent primarily assets of the U.K., Åkers and ASW operations. Long-lived assets of the U.S. include noncurrent asbestos-related insurance receivables of $87,342, $102,945 and $108,423 for 2017, 2016 and 2015, respectively. (5) For 2017, no customers within the Forged and Cast Engineered Products or the Air and Liquid Processing segments exceeded 10% of its net sales. For the Forged and Cast Engineered Product segment, two customers accounted for 24% and 33% of its net sales for 2016 and 2015, respectively. For the Air and Liquid Processing segment, one customer accounted for 10% of its net sales for 2016 and no customers exceeded 10% of net sales for 2015. One customer accounted for 11% of the Corporation’s consolidated sales in 2016.

Quarterly Information - Unaudit

Quarterly Information - Unaudited	12 Months Ended
	Dec. 31, 2017
Quarterly Financial Information Disclosure [Abstract]
Quarterly Information - Unaudited	QUARTERLY INFORMATION – UNAUDITED The quarterly information includes the results of operations of Åkers from March 3, 2016, and ASW from November 1, 2016, their respective dates of acquisition. Accordingly, the quarterly information for 2016 is not fully comparable to 2017. (in thousands, except per share amounts) First Quarter Second Quarter Third Quarter Fourth Quarter 2017 Net sales $ 103,516 $ 110,550 $ 103,886 $ 114,449 Gross profit (a) 18,853 18,533 16,591 20,752 Net loss attributable to Ampco-Pittsburgh (b) (4,783 ) (1,913 ) (2,202 ) (3,191 ) Net loss per common share attributable to Ampco-Pittsburgh: Basic (b) (0.39 ) (0.16 ) (0.18 ) (0.26 ) Diluted (b) (0.39 ) (0.16 ) (0.18 ) (0.26 ) Comprehensive (loss) income attributable to Ampco-Pittsburgh (1,808 ) 2,952 1,660 7,320 2016 Net sales $ 63,578 $ 93,301 $ 82,861 $ 92,126 Gross profit (a) 12,473 15,849 15,594 11,454 Net loss attributable to Ampco-Pittsburgh (c) (2,890 ) (6,486 ) (27,382 ) (43,062 ) Net loss per common share attributable to Ampco-Pittsburgh: Basic (c) (0.26 ) (0.53 ) (2.23 ) (3.51 ) Diluted (c) (0.26 ) (0.53 ) (2.23 ) (3.51 ) Comprehensive loss attributable to Ampco-Pittsburgh (d) (1,501 ) (10,739 ) (22,894 ) (47,972 ) (a) Gross profit excludes depreciation and amortization. (b) The fourth quarter of 2017 includes an unfavorable net impact of approximately $1,565 or $0.13 per common share related to the new U.S. Tax Cuts and Jobs Act legislation. (c) The second, third and fourth quarters of 2016 include valuation allowances of $1,419, $26,903 and $2,083, respectively, to recognize existing net deferred income tax assets to their estimated net realizable value. Fourth quarter of 2016 also includes an after-tax charge of $4,565 or $0.38 per common share for estimated costs of asbestos-related litigation through 2026, net of estimated insurance recoveries, and a settlement with an insurance carrier for an amount greater than originally estimated, and an after-tax charge of $26,676 or $2.23 per common share primarily for the write-off of goodwill in the Forged and Cast Engineered Products reporting unit deemed to be impaired. (d) Third quarter of 2016 includes an adjustment to recognize the effect of a plan amendment to one of its other postretirement benefit plans of $4,762. No income tax benefit was recognized due to the Corporation having a valuation allowance recorded against the deferred income tax assets for the jurisdiction affected by the plan amendment.

Valuation and Qualifying Accoun

Valuation and Qualifying Accounts	12 Months Ended
	Dec. 31, 2017
Valuation And Qualifying Accounts [Abstract]
Valuation and Qualifying Accounts	SCHEDULE II Valuation and Qualifying Accounts For the Years Ended December 31, 2017, 2016 and 2015 (in thousands) Additions Description Balance at Beginning of Period Charged to Costs and Expenses Charged to Other Accounts Deductions Other (4) Balance at End of Period Year ended December 31, 2017 Allowance for doubtful accounts $ 2,228 $ 317 $ (1,355 ) (1) $ (230 ) $ 2 $ 962 Valuation allowance against gross deferred income tax assets $ 45,449 $ 0 $ 154 (2) $ (7,990 ) (3) $ 499 $ 38,112 Year ended December 31, 2016 Allowance for doubtful accounts $ 983 $ 1,598 $ 0 $ (353 ) $ 0 $ 2,228 Valuation allowance against gross deferred income tax assets $ 2,481 $ 0 $ 30,405 (2) $ 0 $ 12,563 $ 45,449 Year ended December 31, 2015 Allowance for doubtful accounts $ 1,374 $ 408 $ (762 ) (1) $ (25 ) $ (12 ) $ 983 Valuation allowance against gross deferred income tax assets $ 3,254 $ 0 $ (715 ) (2) $ 0 $ (58 ) $ 2,481 (1) Represents collection of receivables previously provided for in the allowance for doubtful accounts. (2) Represents valuation allowances established for deferred income tax assets since it is more likely than not that the assets will not be realized. (3) Represents decrease in valuation allowance during 2017, primarily due to the reduction in the U.S. corporate statutory income tax rate from 35% to 21%. (4) Represents primarily the impact from changes in foreign currency exchange rates and, for 2016, valuation allowances recorded at the date of the opening balance sheet for ASW Steel Inc.

Summary of Significant Accoun33

Summary of Significant Accounting Policies (Policies)	12 Months Ended
	Dec. 31, 2017
Accounting Policies [Abstract]
Consolidation	Consolidation The accompanying consolidated financial statements include the assets, liabilities, revenues and expenses of all majority owned subsidiaries and joint ventures over which the Corporation exercises control and, when applicable, entities for which the Corporation has a controlling financial interest or is the primary beneficiary. Investments in joint ventures where the Corporation owns 20% to 50% of the voting stock and has the ability to exercise significant influence over the operating and financial policies of the joint venture are accounted for using the equity method of accounting. Investments in joint ventures whereby the Corporation does not have the ability to exercise significant influence over the operating and financial policies of the joint venture are accounted for using the cost method of accounting. Investments in joint ventures are reviewed for impairment whenever events or circumstances indicate the carrying amount of the investment may not be recoverable. If the estimated fair value of the investment is less than the carrying amount and such decline is determined to be “other than temporary,” then the investment may not be fully recoverable potentially resulting in a write-down of the investment value. Intercompany accounts and transactions are eliminated.
Cash and Cash Equivalents	Cash and Cash Equivalents Securities with purchased original maturities of three months or less are considered to be cash equivalents. The Corporation maintains cash and cash equivalents at various financial institutions which may exceed federally insured amounts.
Inventories	Inventories Inventories are valued at the lower of cost and net realizable value, which is defined as the estimated selling price in the ordinary course of business less reasonably predictable costs of completion, disposal and transportation. Cost includes the cost of raw materials, direct labor and overhead for those items manufactured but not yet sold or for which title has not yet transferred. Fixed production overhead is allocated to inventories based on normal capacity of the production facilities. In periods of abnormally high production, the amount of fixed overhead allocated to each unit of production is decreased so that inventories are not measured above cost. The amount of fixed overhead allocated to inventories is not increased as a consequence of abnormally low production or plant idling. Costs for abnormal amounts of spoilage, handling costs and freight costs are charged to expense when incurred. Cost of domestic raw materials, work-in-process and finished goods inventories is primarily determined by the last-in, first-out (LIFO) method. Cost of domestic supplies and foreign inventories is determined primarily by the first-in, first-out (FIFO) method.
Property, Plant and Equipment	Property, Plant and Equipment Property, plant and equipment purchased new is recorded at cost with depreciation computed using the straight-line method over the following estimated useful lives: land improvements – 15 to 20 years, buildings – 25 to 50 years and machinery and equipment – 3 to 25 years. Property, plant and equipment acquired as part of a business combination is recorded at its estimated fair value with depreciation computed using the straight-line method over the estimated remaining useful lives based in part on third-party valuations. Expenditures that extend economic useful lives are capitalized. Routine maintenance is charged to expense. Gains or losses are recognized on retirements or disposals. Property, plant and equipment are reviewed for impairment at least annually, or whenever events or changes in circumstances indicate the carrying amount of the asset may not be recoverable. If the undiscounted cash flows generated from the use and eventual disposition of the assets are less than their carrying value, then the asset value may not be fully recoverable potentially resulting in a write-down of the asset value. Estimates of future cash flows are based on expected market conditions over the remaining useful life of the primary asset(s). In addition, the remaining depreciation period for the impaired asset would be reassessed and, if necessary, revised. Proceeds from government grants are recorded as a reduction in the purchase price of the underlying assets and amortized against depreciation over the lives of the related assets.
Intangible Assets	Intangible Assets Intangible assets primarily consist of developed technology, customer relationships and trade name. Intangible assets with definite lives are amortized using the straight-line method over their estimated useful life, which is determined by identifying the period over which most of the cash flows are expected to be generated. Additionally, intangible assets, both definite and indefinite lived, are reviewed for impairment at least annually, as of October 1, or whenever events or changes in circumstances indicate the carrying amount of the asset may not be recoverable. If the undiscounted cash flows attributable to the assets are less than their carrying value, then the asset value may not be fully recoverable potentially resulting in a write-down of the asset value. Also, if the estimate of an intangible asset’s remaining useful life changes, the remaining carrying value of the intangible asset will be amortized prospectively over the revised remaining useful life.
Goodwill	Goodwill Goodwill represents the consideration paid in a business combination in excess of the values assigned to the net assets of the acquired entity. Goodwill is not amortized but is tested for impairment at the reporting unit level annually, as of October 1, or whenever events or changes in circumstances indicate the carrying amount may not be recoverable. Goodwill is evaluated for impairment either qualitatively or quantitatively using a two-step approach. Under step one, the fair value of the reporting unit is determined using both a market and income approach. If the fair value of the reporting unit is less than the carrying value of the reporting unit, then goodwill may be impaired causing the second step of the analysis to be completed. Under step two, the fair value of the reporting is allocated to the assets and liabilities of the reporting unit. The unallocated fair value (“implied goodwill”), if any, is compared to the recorded value of goodwill. If the implied goodwill exceeds the recorded value of goodwill, then goodwill is deemed not to be impaired. If the implied goodwill is less than the recorded value of goodwill, then goodwill is deemed to be impaired by the amount that goodwill exceeds implied goodwill. Estimating the fair value of a reporting unit requires the use of significant unobservable inputs, representative of a Level 3 fair value measurement, including market growth and market share, sales volumes and prices, costs to produce, discount rate and estimated capital needs. Management considers historical experience and all available information at the time the fair value of the reporting unit is estimated. Assumptions used to estimate future cash flows are subject to a high degree of judgment and complexity.
Debt Issuance Costs	Debt Issuance Costs Debt issuance costs are amortized as interest expense over the scheduled maturity period of the debt. The costs related to our line-of-credit arrangement are amortized over the term of the arrangement, regardless of whether there are any outstanding borrowings. Unamortized debt issuance costs are either recognized as a direct deduction from the carrying amount of the related debt or, if related to a line-of-credit facility, as an other noncurrent asset on the consolidated balance sheet.
Product Warranty	Product Warranty Provisions for product warranties are recognized at the time the underlying sale is recorded. The provision is based on historical experience as a percentage of sales adjusted for potential claims when a liability is probable and for known claims.
Employee Benefit Plans	Employee Benefit Plans Funded Status If the fair value of the plan assets exceeds the projected benefit obligation, the over-funded projected benefit obligation is recognized as an asset (prepaid pensions) on the consolidated balance sheet. Conversely, if the projected benefit obligation exceeds the fair value of the plan assets, the under-funded projected benefit obligation is recognized as a liability (employee benefit obligations) on the consolidated balance sheet. Gains and losses arising from the difference between actuarial assumptions and actual experience and unamortized prior service costs are recorded as a separate component of accumulated other comprehensive loss. Net Periodic Pension and Other Postretirement Costs Net periodic pension and other postretirement costs includes service cost, interest cost, expected rate of return on the market-related value of plan assets, amortization of prior service costs and recognized actuarial gains or losses. When actuarial gains or losses exceed 10% of the greater of the projected benefit obligation or the market-related value of plan assets, they are amortized to net periodic pension and other postretirement costs over the average remaining service period of the employees expected to receive benefits under the plan or over the remaining life expectancy of the employees expected to receive benefits if “all or almost all” of the plan’s participants are inactive. When actuarial gains or losses are less than 10% of the greater of the projected benefit obligation or the market-related value of plan assets, they are included in net periodic pension and other postretirement costs indirectly as a result of lower/higher interest costs arising from a decrease/increase in the projected benefit obligation. The market-related value of plan assets is determined using a five-year moving average which recognizes 20% of unrealized gains and losses each year.
Other Comprehensive Income (Loss)	Other Comprehensive Income (Loss) Other comprehensive income (loss) includes changes in assets and liabilities from non-owner sources including foreign currency translation adjustments, unamortized prior service costs and unrecognized actuarial gains and losses associated with employee benefit plans, unrealized holding gains and losses on securities designated as available for sale, and changes in the fair value of derivatives designated and effective as cash flow hedges. Certain components of other comprehensive income (loss) are presented net of income tax. Foreign currency translation adjustments exclude the effect of income tax since earnings of non-U.S. subsidiaries are deemed to be reinvested for an indefinite period of time. Reclassification adjustments are amounts which are realized during the year and, accordingly, are deducted from other comprehensive income (loss) in the period in which they are included in net income (loss) or when a transaction no longer qualifies as a cash flow hedge. Foreign currency translation adjustments are included in net income (loss) upon sale or upon complete or substantially complete liquidation of an investment in a foreign entity. With respect to employee benefit plans, unamortized prior service costs are included in net income (loss), either immediately upon curtailment of the employee benefit plan or over the average remaining service period or life expectancy of the employees expected to receive benefits, and unrecognized actuarial gains and losses are included in net income (loss) indirectly as a result of lower/higher interest costs arising from a decrease/increase in the projected benefit obligation. Unrealized holding gains and losses on securities are included in net income (loss) when the underlying security is sold. Changes in the fair value of derivatives are included in net income (loss) when the projected sale occurs or, if a foreign currency purchase contract, over the estimated useful life of the underlying asset.
Foreign Currency Translation	Foreign Currency Translation Assets and liabilities of the Corporation’s foreign operations are translated at year-end exchange rates and the statements of operations are translated at the average exchange rates for the year. Gains or losses resulting from translating foreign currency financial statements are accumulated as a separate component of accumulated other comprehensive loss until the entity is sold or substantially liquidated.
Revenue Recognition	Revenue Recognition Revenue from sales is recognized when persuasive evidence of an arrangement exists, delivery has occurred, the sales price is fixed or determinable, and collectability is reasonably assured. Persuasive evidence of an arrangement identifies the final understanding between the parties as to the specific nature and terms of the agreed-upon transaction that creates enforceable obligations. It can be in the form of an executed purchase order from the customer, sales agreement issued by the Corporation or a similar arrangement deemed to be normal and customary business practice for that particular customer or class of customer (collectively, a sales agreement). Delivery and performance is considered to have occurred when the customer has taken title and assumed the risks and rewards of ownership of the product. Typically, this occurs when the product is shipped to the customer (i.e., FOB shipping point), delivered to the customer (i.e., FOB destination), or, for foreign sales, in accordance with trading guidelines known as Incoterms. Incoterms are standard trade definitions used in international contracts and are developed, maintained and promoted by the ICC Commission on Commercial Law and Practice. The sales price required to be paid by the customer is fixed or determinable from the sales agreement. It is not subject to refund or adjustment except for a variable-index surcharge provision which increases or decreases, as applicable, the selling price of a mill roll for corresponding changes in the published index cost of certain raw materials. The variable-index surcharge is recognized as revenue when the corresponding revenue for the inventory is recognized. Likelihood of collectability is assessed prior to acceptance of an order. There are no customer-acceptance provisions other than customer inspection and testing prior to shipment. Post-shipment obligations are insignificant. Amounts billed to the customer for shipping and handling are recorded within net sales and the related costs are recorded within costs of products sold (excluding depreciation and amortization). Amounts billed for taxes assessed by various government authorities (e.g., sales tax, value-added tax, etc.) are excluded from the determination of net income (loss) and instead are recorded as a liability until remitted to the government authority.
Stock-Based Compensation	Stock-Based Compensation Stock-based compensation, such as stock options, restricted stock units and performance shares, is recognized over the vesting period based upon the fair value of the award at the date of grant. For stock options, the fair value is determined by the Black Scholes option pricing model and is expensed over the vesting period of three years. For restricted stock units, the fair value is equal to the closing price of the Corporation’s common stock on the New York Stock Exchange (“NYSE”) on the date of grant and is expensed over the vesting period of three years. For performance share awards that vest subject to a performance condition, the fair value is equal to the closing price of the Corporation’s stock on the NYSE on the date of grant. For performance share awards that vest subject to a market condition, fair value is determined using a Monte Carlo simulation model. The fair value of performance share awards is expensed over the performance period when it is probable that the performance condition will be achieved.
Derivative Instruments	Derivative Instruments Derivative instruments which include forward exchange (for foreign currency sales and purchases) and futures contracts are recorded on the consolidated balance sheet as either an asset or a liability measured at their fair value. The accounting for changes in the fair value of a derivative depends on the use of the derivative. To the extent that a derivative is designated and effective as a cash flow hedge of an exposure to future changes in value, the change in the fair value of the derivative is deferred in accumulated other comprehensive loss. Any portion considered to be ineffective, including that arising from the unlikelihood of an anticipated transaction to occur, is reported as a component of earnings (other income/expense) immediately. Upon occurrence of the anticipated sale, the foreign currency sales contract designated and effective as a cash flow hedge is de-designated as a fair value hedge and the change in fair value previously deferred in accumulated other comprehensive loss is reclassified to earnings (net sales) with subsequent changes in fair value recorded as a component of earnings (other income/expense). Upon occurrence of the anticipated purchase, the foreign currency purchase contract is settled and the change in fair value deferred in accumulated other comprehensive loss is reclassified to earnings (depreciation and amortization expense) over the life of the underlying assets. Upon settlement of a futures contract, the change in fair value deferred in accumulated other comprehensive loss is reclassified to earnings (costs of products sold, excluding depreciation and amortization) when the corresponding inventory is sold and revenue is recognized. To the extent that a derivative is designated and effective as a hedge of an exposure to changes in fair value, the change in the derivative’s fair value will be offset in the statement of operations by the change in the fair value of the item being hedged and is recorded as a component of earnings (other income/expense). Cash flows associated with the derivative instruments are recorded as a component of operating activities on the consolidated statement of cash flows. The Corporation does not enter into derivative transactions for speculative purposes and, therefore, holds no derivative instruments for trading purposes.
Fair Value	Fair Value Fair value is defined as the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants as of the measurement date. A hierarchy of inputs is used to determine fair value measurements with three levels. Level 1 inputs are quoted prices in active markets for identical assets or liabilities and are considered the most reliable evidence of fair value. Level 2 inputs are observable prices that are not quoted on active exchanges. Level 3 inputs are unobservable inputs used for measuring the fair value of assets or liabilities.
Legal Costs	Legal Costs Legal costs expected to be incurred in connection with loss contingencies are accrued when such costs are probable and estimable.
Income Taxes	Income Taxes On December 22, 2017, the U.S. federal government enacted the Tax Cuts and Jobs Act (the “Tax Reform”), to become effective January 1, 2018, which, among other things, imposed a one-time tax on deemed repatriated earnings of foreign subsidiaries. Accordingly, the tax impact of this deemed repatriation of previously untaxed foreign earnings was included within the U.S. taxable income for 2017, reducing the overall tax loss generated in the current year. Any future income earned in foreign subsidiaries will no longer be subject to U.S. tax under current U.S. law. Any remittance of future earnings to the U.S. will be subject to foreign withholding requirements; however, the Corporation estimates the impact of this would be insignificant. Income taxes are recognized during the year in which transactions enter into the determination of financial statement income. Deferred income tax assets and liabilities are recognized for the future tax consequences of temporary differences between the book carrying amount and the tax basis of assets and liabilities including net operating loss carryforwards. A valuation allowance is provided against a deferred income tax asset when it is “more likely than not” the asset will not be realized. Similarly, if a determination is made that it is “more likely than not” the deferred income tax asset will be realized, the related valuation allowance would be reduced and a benefit to earnings would be recorded. Penalties and interest are recognized as a component of the income tax provision. Tax benefits are recognized in the financial statements for tax positions taken or expected to be taken in a tax return when it is “more likely than not” that the tax authorities will sustain the tax position solely on the basis of the position’s technical merits. Consideration is given primarily to legislation and statutes, legislative intent, regulations, rulings and case law as well as their applicability to the facts and circumstances of the tax position when assessing the sustainability of the tax position. In the event a tax position no longer meets the “more likely than not” criteria, the tax benefit is reversed by recognizing a liability and recording a charge to earnings. Conversely, if a tax position subsequently meets the “more likely than not” criteria, a tax benefit would be recognized by reducing the liability and recording a credit to earnings.
Earnings Per Common Share	Earnings Per Common Share Basic earnings per common share is computed by dividing net income (loss) by the weighted average number of common shares outstanding for the period. The computation of diluted earnings per common share is similar to basic earnings per common share except that the denominator is increased to include the dilutive effect of the net additional common shares that would have been outstanding assuming exercise of outstanding stock awards, calculated using the treasury stock method. The computation of diluted earnings per share would not assume the exercise of an outstanding stock award if the effect on earnings per common share would be antidilutive. Similarly, the computation of diluted earnings per share would not assume the exercise of outstanding stock awards if the Corporation incurred a net loss since the effect on earnings per common share would be antidilutive. The weighted average number of common shares outstanding assuming exercise of dilutive stock awards was 12,330,401 for 2017, 11,951,181 for 2016 and 10,447,066 for 2015. Weighted-average outstanding stock awards excluded from the diluted earnings per common share calculation, since the effect would have been antidilutive, were 1,013,008 for 2017, 1,163,396 for 2016 and 1,138,287 for 2015.
Recently Implemented Accounting Pronouncements	Recently Implemented Accounting Pronouncements In January 2018, the Financial Accounting Standards Board (“FASB”) issued ASU 2018-02, Income Statement – Reporting Comprehensive Income In March 2016, the FASB issued ASU 2016-09, Improvements to Employee Share-Based Payment Accounting In July 2015, the FASB issued ASU 2015-11, Simplifying the Measurement of Inventory
Recently Issued Accounting Pronouncements	Recently Issued Accounting Pronouncements In August 2017, the FASB issued ASU 2017-12, Derivatives and Hedging In May 2017, the FASB issued ASU 2017-09, Scope of Modification Accounting In March 2017, the FASB issued ASU 2017-07, Improving the Presentation of Net Periodic Pension Cost and Net Periodic Postretirement Benefit Cost In August 2016, the FASB issued ASU 2016-15, Classification of Certain Cash Receipts and Cash Payments In May 2016, April 2016, March 2016 and May 2014, the FASB issued ASUs 2016-12, 2016-10, 2016-08 and 2014-09, respectively, Revenue from Contracts with Customers (Topic 606) In February 2016, the FASB issued ASU 2016-02, Leases (Topic 842) In January 2016, the FASB issued ASU 2016-01, Recognition and Measurement of Financial Assets and Liabilities

Acquisitions (Tables)

Acquisitions (Tables)	12 Months Ended
	Dec. 31, 2017
Summary of Fair Value of Assets Acquired and Liabilities Assumed	The fair value of assets acquired and liabilities assumed as of the date of acquisition is as follows: Current assets (excluding inventories) $ 41,703 Inventories 30,332 Property, plant and equipment 71,871 Intangible assets 11,784 Other noncurrent assets 8,068 Current liabilities (71,690 ) Noncurrent liabilities (43,153 ) Net assets acquired 48,915 Noncontrolling interest (2,019 ) Goodwill 27,259 Base purchase price $ 74,155
Summary of Pro Forma Financial Information	The following pro forma financial information is presented for informational purposes only and is not necessarily indicative of the results of operations that would have been achieved had the acquisition occurred at the beginning of 2015: Year Ended December 31, 2016 2015 Net sales $ 393,243 $ 440,265 Loss before income taxes (includes noncontrolling interest) $ (63,498 ) $ (11,945 ) Net loss attributable to Ampco-Pittsburgh $ (85,778 ) $ (24,740 ) Net loss per common share (basic) attributable to Ampco-Pittsburgh $ (6.94 ) $ (2.03 )
ASW Steel Inc [Member]
Summary of Fair Value of Assets Acquired and Liabilities Assumed	The fair value of assets acquired and liabilities assumed as of the date of the acquisition is summarized below. Current assets (excluding inventories) $ 6,525 Inventories 6,956 Property, plant and equipment 10,310 Current liabilities (10,675 ) Outstanding indebtedness (9,616 ) Base purchase price $ 3,500

Inventories (Tables)

Inventories (Tables)	12 Months Ended
	Dec. 31, 2017
Inventory Disclosure [Abstract]
Schedule of Inventories	2017 2016 Raw materials $ 24,249 $ 23,964 Work-in-progress 42,840 29,198 Finished goods 24,083 20,046 Supplies 16,389 10,371 Inventories $ 107,561 $ 83,579

Property, Plant and Equipment (

Property, Plant and Equipment (Tables)	12 Months Ended
	Dec. 31, 2017
Property Plant And Equipment [Abstract]
Schedule of Property, Plant and Equipment	2017 2016 Land and land improvements $ 12,172 $ 11,747 Buildings 68,572 66,017 Machinery and equipment 340,396 323,684 Construction-in-process 5,019 2,595 Other 7,193 7,495 433,352 411,538 Accumulated depreciation (218,372 ) (197,130 ) Property, plant and equipment, net $ 214,980 $ 214,408

Intangible Assets (Tables)

Intangible Assets (Tables)	12 Months Ended
	Dec. 31, 2017
Goodwill And Intangible Assets Disclosure [Abstract]
Schedule of Intangible Assets	2017 2016 Customer relationships $ 6,543 $ 6,244 Developed technology 4,429 4,248 Trade name 2,696 2,537 13,668 13,029 Accumulated amortization (2,647 ) (1,428 ) Intangible assets, net $ 11,021 $ 11,601
Summary of Changes in Intangible Assets	The following summarizes changes in intangible assets for the year ended December 31: 2017 2016 Balance at the beginning of the year $ 11,601 $ 1,193 Changes in intangible assets 0 11,784 Amortization of intangible assets (1,219 ) (1,106 ) Other, primarily impact from changes in foreign currency exchange rates 639 (270 ) Balance at the end of the year $ 11,021 $ 11,601

Other Current Liabilities (Tabl

Other Current Liabilities (Tables)	12 Months Ended
	Dec. 31, 2017
Other Liabilities Disclosure [Abstract]
Schedule of Other Current Liabilities	2017 2016 Customer-related liabilities $ 18,512 $ 21,564 Accrued interest payable 2,697 2,274 Accrued sales commissions 2,301 1,693 Other 13,579 16,666 Other current liabilities $ 37,089 $ 42,197
Schedule of Changes in Liability for Product Warranty Claims	The following summarizes changes in the liability for product warranty claims for the year ended December 31: 2017 2016 2015 Balance at the beginning of the year $ 11,521 $ 6,358 $ 6,672 Acquisitions – opening balance sheet liability for warranty claims 0 7,130 0 Satisfaction of warranty claims (4,014 ) (4,297 ) (2,452 ) Provision for warranty claims 3,601 3,282 2,293 Other, primarily impact from changes in foreign currency exchange rates 594 (952 ) (155 ) Balance at the end of the year $ 11,702 $ 11,521 $ 6,358

Borrowing Arrangements (Tables)

Borrowing Arrangements (Tables)	12 Months Ended
	Dec. 31, 2017
Debt Disclosure [Abstract]
Schedule of Outstanding Borrowings	In March 2017, the Corporation repaid the debt assumed in connection with the acquisition of ASW (credit facility and term loan), including interest, fees and early termination costs. Accordingly, outstanding borrowings of the Corporation as of December 31, 2017, and 2016, consisted of the following: 2017 2016 Industrial Revenue Bonds $ 13,311 $ 13,311 Promissory notes (and interest) 25,395 23,844 Revolving Credit and Security Agreement 20,349 0 Minority shareholder loan 5,325 4,990 Credit facility 0 7,146 Term loan 0 762 Capital leases 1,773 2,161 Outstanding borrowings 66,153 52,214 Debt – current portion (19,335 ) (26,825 ) Long-term debt $ 46,818 $ 25,389

Pension and Other Postretirem40

Pension and Other Postretirement Benefits (Tables)	12 Months Ended
	Dec. 31, 2017
Compensation And Retirement Disclosure [Abstract]
Reconciliation of Projected Benefit Obligations (PBO), Plan Assets, the Funded Status of the Plans and the Amounts Recognized in the Consolidated Balance Sheets	The following provides a reconciliation of projected benefit obligations (“PBO”), plan assets and the funded status of the plans for the Corporation’s defined benefit plans calculated using a measurement date as of the end of the respective years. U.S. Pension Benefits (a) Foreign Pension Benefits Other Postretirement Benefits 2017 2016 2017 2016 2017 2016 Change in projected benefit obligations: PBO at January 1 $ 244,440 $ 181,803 $ 66,910 $ 63,750 $ 19,059 $ 8,117 Åkers acquisition – PBO at March 3 0 68,081 0 5,393 0 17,467 Service cost 1,651 1,714 150 314 492 504 Interest cost 8,413 9,977 1,845 2,250 571 722 Plan amendments 0 0 0 0 165 (4,762 ) Plan settlements (b) 0 (2,739 ) 0 0 0 0 Plan curtailments 0 (1,181 ) 0 0 0 0 Foreign currency exchange rate changes 0 0 5,948 (11,477 ) 0 0 Actuarial loss (gain) 13,825 (160 ) (7,954 ) 8,869 (2,170 ) (1,598 ) Participant contributions 0 0 0 0 92 80 Benefits paid from plan assets (12,950 ) (12,679 ) (1,813 ) (2,189 ) 0 0 Benefits paid by the Corporation (403 ) (376 ) (473 ) 0 (1,230 ) (1,471 ) PBO at December 31 $ 254,976 $ 244,440 $ 64,613 $ 66,910 $ 16,979 $ 19,059 Change in plan assets: Fair value of plan assets at January 1 $ 188,722 $ 139,376 $ 48,055 $ 49,628 $ 0 $ 0 Åkers acquisition – fair value of plan assets at March 3 0 50,108 0 0 0 0 Actual return on plan assets 23,366 14,656 3,998 7,859 0 0 Foreign currency exchange rate changes 0 0 4,673 (8,930 ) 0 0 Corporate contributions 403 376 1,979 1,687 1,138 1,391 Participant contributions 0 0 0 0 92 80 Plan settlements (b) 0 (2,739 ) 0 0 0 0 Gross benefits paid (13,353 ) (13,055 ) (2,286 ) (2,189 ) (1,230 ) (1,471 ) Fair value of plan assets at December 31 $ 199,138 $ 188,722 $ 56,419 $ 48,055 $ 0 $ 0 Funded status of the plans: Fair value of plan assets $ 199,138 $ 188,722 $ 56,419 $ 48,055 $ 0 $ 0 Less benefit obligations 254,976 244,440 64,613 66,910 16,979 19,059 Funded status at December 31 $ (55,838 ) $ (55,718 ) $ (8,194 ) $ (18,855 ) $ (16,979 ) $ (19,059 ) (a) Includes the nonqualified defined benefit pension plan. (b) Represents lump sum payments. The following provides a summary of amounts recognized in the consolidated balance sheets. U.S. Pension Benefits Foreign Pension Benefits Other Postretirement Benefits 2017 2016 2017 2016 2017 2016 Employee benefit obligations: Accrued payrolls and employee benefits (a) $ (432 ) $ (409 ) $ 0 $ 0 $ (1,371 ) $ (1,276 ) Employee benefit obligations (b) (55,406 ) (55,309 ) (8,194 ) (18,855 ) (15,608 ) (17,783 ) $ (55,838 ) $ (55,718 ) $ (8,194 ) $ (18,855 ) $ (16,979 ) $ (19,059 ) Accumulated other comprehensive loss: (c) Net actuarial loss (gain) $ 47,252 $ 48,153 $ 25,914 $ 25,547 $ (1,211 ) $ 936 Prior service cost (credit) 156 209 (9,174 ) 0 (13,809 ) (15,581 ) $ 47,408 $ 48,362 $ 16,740 $ 25,547 $ (15,020 ) $ (14,645 ) (a) Recorded as a current liability in the consolidated balance sheet. (b) Recorded as a noncurrent liability in the consolidated balance sheet. (c) Amounts are pre-tax.
Amounts Included in Accumulated Other Comprehensive Loss to be Recognized over Next Year	Amounts included in accumulated other comprehensive loss as of December 31, 2017, expected to be recognized in net periodic pension and other postretirement costs in 2018 include: U.S. Pension Benefits Foreign Pension Benefits Other Postretirement Benefits Net actuarial loss (gain) $ 1,763 $ 784 $ (109 ) Prior service cost (credit) 52 (324 ) (1,607 ) $ 1,815 $ 460 $ (1,716 )
Schedule of Target Asset Allocations and Major Asset Categories	The following summarizes target asset allocations (within +/-5% considered acceptable) and major asset categories. Certain investments are classified differently for target asset allocation purposes and external reporting purposes. Adoption of the glide-path strategy in 2017 did not result in any significant changes to the target asset allocations. In December 2016, the Corporation changed investment managers for the legacy plan; accordingly, there was temporarily a higher amount in cash and cash equivalents. U.S. Pension Benefits Foreign Pension Benefits Target Allocation Percentage of Plan Assets Target Allocation Percentage of Plan Assets Dec. 31, 2017 2017 2016 Dec. 31, 2017 2017 2016 Equity Securities 60 % 58 % 47 % 44 % 49 % 48 % Fixed-Income Securities 20 % 21 % 21 % 35 % 33 % 34 % Alternative Investments 15 % 16 % 8 % 21 % 17 % 18 % Other (primarily cash and cash equivalents) 5 % 5 % 24 % 0 % 1 % 0 %
Asset Categories Based on the Nature and Risks of the Plans Assets	Asset categories based on the nature and risks of the U.S. Pension Benefit Plans’ assets as of December 31, 2017, are summarized below. Quoted Prices in Active Markets for Identical Inputs (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) Total Equity Securities: U.S. Consumer discretionary $ 637 $ 0 $ 0 $ 637 Consumer staples 896 0 0 896 Energy 427 0 0 427 Financial 1,362 0 0 1,362 Healthcare 1,192 0 0 1,192 Industrials 819 0 0 819 Information technology 2,061 0 0 2,061 Materials 248 0 0 248 Mutual funds 91,258 0 0 91,258 Telecommunications 198 0 0 198 Utilities 204 0 0 204 Total Equity Securities 99,302 0 0 99,302 Fixed Income Securities: Corporate bonds 0 10,801 0 10,801 Mutual funds 18,884 0 0 18,884 Treasury bonds 6,976 0 0 6,976 Agency bonds 0 926 0 926 Total Fixed Income Securities 25,860 11,727 0 37,587 Alternative Investments: Managed funds (a) 0 0 49,838 49,838 Total Alternative Investments 0 0 49,838 49,838 Other: Cash and cash equivalents (b) 11,012 0 0 11,012 Commingled funds 0 174 0 174 Other (c) 2 0 1,223 1,225 Total Other 11,014 174 1,223 12,411 $ 136,176 $ 11,901 $ 51,061 $ 199,138 (a) Includes approximately 47.3% in equity and equity-like asset securities, 41.1% in alternative investments (real assets, commodities and resources, absolute return funds) and 9.6% in fixed income securities and 2.0% in other, primarily cash and cash equivalents. (b) Includes investments in temporary funds. (c) Includes accrued receivables and pending broker settlements. Categories of Plan Assets Asset categories based on the nature and risks of the U.S. Pension Benefit Plans’ assets as of December 31, 2016, are summarized below. Quoted Prices in Active Markets for Identical Inputs (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) Total Equity Securities: U.S. Bank & financial services $ 631 $ 0 $ 0 $ 631 Capital goods 75 0 0 75 Chemicals 20 0 0 20 Commercial services 16 0 0 16 Electronics 67 0 0 67 Health care 201 0 0 201 Mutual funds 72,571 0 0 72,571 Oil & gas 87 0 0 87 Retail 101 0 0 101 Technology 188 0 0 188 Transportation 18 0 0 18 Wholesale distribution 16 0 0 16 Other (represents 8 business sectors) 211 0 0 211 International Chemicals 7 0 0 7 Technology 6 0 0 6 Total Equity Securities 74,215 0 0 74,215 Fixed Income Securities: Mutual funds 36,601 0 0 36,601 Total Fixed Income Securities 36,601 0 0 36,601 Alternative Investments: Managed funds (a) 0 0 33,830 33,830 Total Alternative Investments 0 0 33,830 33,830 Other: Cash and cash equivalents (b) 27,902 0 0 27,902 Commingled funds 0 154 0 154 Other (c) 16,020 0 0 16,020 Total Other 43,922 154 0 44,076 $ 154,738 $ 154 $ 33,830 $ 188,722 (a) Includes approximately 45.9% in equity and equity-like asset securities, 44.5% in alternative investments (real assets, commodities and resources, absolute return funds) and 7.4% in fixed income securities and 2.2% in other, primarily cash and cash equivalents. (b) Includes investments in temporary funds. (c) Includes accrued receivables and pending broker settlements. Asset categories based on the nature and risks of the Foreign Pension Benefit Plan’s assets as of December 31, 2017, are summarized below. Quoted Prices in Active Markets for Identical Inputs (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) Total Equity Securities: Commingled Funds (U.K.) $ 0 $ 4,617 $ 0 $ 4,617 Commingled Funds (International) 0 23,015 0 23,015 Total Equity Securities 0 27,632 0 27,632 Fixed-Income Securities: Commingled Funds (U.K.) 0 18,851 0 18,851 Alternative Investments: Hedge and Absolute Return Funds 0 0 9,637 9,637 Cash and cash equivalents 299 0 0 299 $ 299 $ 46,483 $ 9,637 $ 56,419 Asset categories based on the nature and risks of the Foreign Pension Benefit Plan’s assets as of December 31, 2016, are summarized below. Quoted Prices in Active Markets for Identical Inputs (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) Total Equity Securities: Commingled Funds (U.K.) $ 0 $ 3,716 $ 0 $ 3,716 Commingled Funds (International) 0 19,146 0 19,146 Total Equity Securities 0 22,862 0 22,862 Fixed-Income Securities: Commingled Funds (U.K.) 0 16,426 0 16,426 Alternative Investments: Hedge and Absolute Return Funds 0 0 8,593 8,593 Cash and cash equivalents 174 0 0 174 $ 174 $ 39,288 $ 8,593 $ 48,055
Summary of Changes in the Fair Value of the Level 3 Plan Assets for U.S. and Foreign Pension Plans	The table below sets forth a summary of changes in the fair value of the Level 3 plan assets for U.S. and foreign pension plans for the year ended December 31, 2017. Alternative Investments U.S. Pension Benefits Foreign Pension Benefits Fair value as of January 1, 2017 $ 33,830 $ 8,593 Contributions 16,000 0 Withdrawals (5,364 ) 0 Realized gains 1,304 0 Change in net unrealized gains 4,068 229 Other, primarily impact from changes in foreign currency exchange rates 0 815 Fair value as of December 31, 2017 $ 49,838 $ 9,637 The table below sets forth a summary of changes in the fair value of the Level 3 plan assets for U.S. and foreign pension plans for the year ended December 31, 2016. Alternative Investments U.S. Pension Benefits Foreign Pension Benefits Fair value as of January 1, 2016 $ 4,967 $ 32,210 $ 10,571 Withdrawals (4,967 ) 0 0 Realized gains 0 1,857 0 Change in net unrealized losses 0 (237 ) (280 ) Other, primarily impact from changes in foreign currency exchange rates 0 0 (1,698 ) Fair value as of December 31, 2016 $ 0 $ 33,830 $ 8,593
Net Periodic Pension and Other Postretirement Benefit Costs	Net periodic pension and other postretirement benefit costs include the following components for the year ended December 31: U.S. Pension Benefits Foreign Pension Benefits Other Postretirement Benefits 2017 2016 2015 2017 2016 2015 2017 2016 2015 Service cost $ 1,651 $ 1,714 $ 2,743 $ 150 $ 314 $ 0 $ 492 $ 504 $ 384 Interest cost 8,413 9,977 7,990 1,845 2,250 2,394 571 722 474 Expected return on plan assets (12,503 ) (13,424 ) (10,996 ) (2,239 ) (2,461 ) (2,681 ) 0 0 0 Amortization of: Prior service cost (credit) 52 44 371 0 0 0 (1,607 ) (1,277 ) (672 ) Actuarial loss (gain) 4,111 3,324 5,440 751 670 845 (24 ) 36 26 Curtailment (gain) loss 0 (887 ) 1,303 0 0 0 0 0 0 $ 1,724 $ 748 $ 6,851 $ 507 $ 773 $ 558 $ (568 ) $ (15 ) $ 212
Discount Rates and Weighted-Average Wage Increases Used to Determine the Benefit Obligations	The discount rates and weighted-average wage increases used to determine the benefit obligations as of December 31, 2017, and 2016, are summarized below. U.S. Pension Benefits Foreign Pension Benefits Other Postretirement Benefits 2017 2016 2017 2016 2017 2016 Discount rate 3.63-3.72% 4.02-4.25% 2.45% 2.50-2.65% 3.46-3.69% 3.90-4.13% Wage increases 3.00% 3.00% n/a n/a n/a n/a
Assumptions Regarding Net Periodic Pension and Other Postretirement Benefit Costs	The following assumptions were used to determine net periodic pension and other postretirement benefit costs for the year ended December 31: U.S. Pension Benefits Foreign Pension Benefits Other Postretirement Benefits 2017 2016 2015 2017 2016 2015 2017 2016 2015 Discount rate 4.02-4.25% 4.20-4.40% 4.00-4.10% 2.50-2.65% 3.00-3.65% 3.50% 3.90-4.13% 3.80-4.20% 4.00% Expected long-term rate of return 6.95-7.50% 6.90-7.75% 8.00% 4.45% 5.40% 5.40% n/a n/a n/a Wages increases 3.00% 3.00% 4.00% n/a n/a n/a n/a n/a n/a

Stock-Based Compensation (Table

Stock-Based Compensation (Tables)	12 Months Ended
	Dec. 31, 2017
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Summary of Outstanding and Exercisable Incentive Options (RSUs and PSUs)	A summary of outstanding and exercisable incentive options (RSUs and PSUs) as of December 31, 2017, and activity for the year ended December 31, 2017, is as follows: Number of RSUs Weighted Average Fair Value Number of PSUs Weighted Average Fair Value Outstanding at January 1, 2017 155,845 $ 17.53 39,348 $ 21.62 Granted 76,473 14.00 97,788 14.93 Converted to common stock (58,677 ) 17.25 0 N/A Forfeited/cancelled (14,935 ) 16.76 (34,622 ) 14.99 Outstanding at December 31, 2017 158,706 $ 16.00 102,514 $ 17.47
Summary of Outstanding and Exercisable Stock Options	A summary of outstanding and exercisable stock options as of December 31, 2017, and activity for the year ended December 31, 2017, is as follows: Number of Shares Under Options Weighted Average Exercise Price Remaining Contractual Life In Years Intrinsic Value Outstanding at January 1, 2017 1,005,836 $ 24.07 4.2 $ 0 Granted 0 N/A Exercised 0 N/A Forfeited (190,501 ) 26.03 Outstanding at December 31, 2017 815,335 $ 23.61 3.3 $ 0 Exercisable at December 31, 2017 815,335 $ 23.61 3.3 $ 0 Vested or expected to vest at December 31, 2017 815,335 $ 23.61 3.3 $ 0

Accumulated Other Comprehensi42

Accumulated Other Comprehensive Loss (Tables)	12 Months Ended
	Dec. 31, 2017
Equity [Abstract]
Net Change and Ending Balances for Various Components of Other Comprehensive Income (Loss) and Accumulated Other Comprehensive Loss	Net change and ending balances for the various components of other comprehensive income (loss) and for accumulated other comprehensive loss as of and for the year ended December 31, 2015, 2016 and 2017 are summarized below. Foreign Currency Translation Adjustments Unrecognized Components of Employee Benefit Plans Unrealized Holding Gains on Securities Derivatives Accumulated Other Comprehensive Loss Balance at January 1, 2015 $ (4,426 ) $ (65,396 ) $ 984 $ 85 $ (68,753 ) Net Change (3,967 ) 15,453 (292 ) (40 ) 11,154 Balance at December 31, 2015 (8,393 ) (49,943 ) 692 45 (57,599 ) Net Change (14,580 ) 11,307 (633 ) 506 (3,400 ) Balance at December 31, 2016 (22,973 ) (38,636 ) 59 551 (60,999 ) Net Change 11,041 10,582 573 134 22,330 Impact from adoption of ASU 2018-02 (Note 15) 0 (6,142 ) 0 54 (6,088 ) Balance at December 31, 2017 $ (11,932 ) $ (34,196 ) $ 632 $ 739 $ (44,757 )
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 consolidated statements of operations for components reclassified from accumulated other comprehensive loss for each of the years ended December 31. Amounts in parentheses represent credits to net income (loss). 2017 2016 2015 Amortization of unrecognized employee benefit costs: Costs of products sold (excluding depreciation and amortization) $ 1,934 $ 2,463 $ 3,604 Selling and administrative 1,148 (719 ) 3,354 Other expense 201 166 355 Total before income tax 3,283 1,910 7,313 Income tax provision 0 0 (2,573 ) Net of income tax $ 3,283 $ 1,910 $ 4,740 Realized gains on sale of marketable securities: Selling and administrative $ (29 ) $ (1,404 ) $ (82 ) Income tax provision 0 366 29 Net of income tax $ (29 ) $ (1,038 ) $ (53 ) Realized gains/losses from settlement of cash flow hedges: Net sales (foreign currency sales contracts) $ 0 $ (6 ) $ (17 ) Depreciation and amortization (foreign currency purchase contracts) (31 ) (27 ) (27 ) Costs of products sold (excluding depreciation and amortization) (futures contracts – copper and aluminum) (639 ) 220 751 Total before income tax (670 ) 187 707 Income tax provision 0 (79 ) (272 ) Net of income tax $ (670 ) $ 108 $ 435
Summary of Income Tax Expense (Benefit) Associated with Various Components of Other Comprehensive Income (Loss)	The income tax expense (benefit) associated with the various components of other comprehensive income (loss) for each of the years ended December 31 is summarized below. For 2017 and 2016, there was no income tax benefit for certain items due to the Corporation having a valuation allowance recorded against its deferred income tax assets for the jurisdiction where the expense is recognized. See Note 15. 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. 2017 2016 2015 Income tax expense (benefit) associated with changes in: Unrecognized employee benefit costs $ 0 $ 0 $ (4,731 ) Unrealized holding losses on marketable securities 0 0 134 Fair value of cash flow hedges 0 0 294 Income tax expense (benefit) associated with reclassification adjustments: Amortization of unrecognized employee benefit costs 0 0 (2,573 ) Realized gains from sale of marketable securities 0 366 29 Realized losses from settlement of cash flow hedges 0 (79 ) (272 )

Derivative Instruments (Tables)

Derivative Instruments (Tables)	12 Months Ended
	Dec. 31, 2017
Derivative Instruments And Hedging Activities Disclosure [Abstract]
Location and Fair Value of Foreign Currency Sales Contracts Recorded on Condensed Consolidated Balance Sheets	The following summarizes location and fair value of the foreign currency sales contracts recorded on the consolidated balance sheets as of December 31: Location 2017 2016 Fair value hedge contracts Other current assets $ 961 $ 214 Other noncurrent assets 0 2 Other current liabilities 89 940 Other noncurrent liabilities 1 35 Fair value hedged item Receivables (269 ) 121 Other current assets 169 808 Other noncurrent assets 16 45 Other current liabilities 907 233 Other noncurrent liabilities 0 5
Schedule Of Derivative Instruments Amount Recognized And Reclassified From Accumulated Other Comprehensive Income Loss Table Text Block	The change in the fair value of the cash flow contracts is recorded as a component of accumulated other comprehensive loss. Amounts recognized as and reclassified from accumulated other comprehensive loss are recorded as a component of other comprehensive income (loss) and are summarized below. Amounts are after-tax, where applicable. Certain amounts recognized as comprehensive income (loss) for 2017 and 2016 have no tax effect due to the Corporation recording a valuation allowance against its deferred income tax assets in the related jurisdictions. See Note 15. For the Year Ended December 31, 2017 Accumulated Other Comprehensive Income (Loss) Beginning of the Year Plus Recognized as Comprehensive Income (Loss) Less Gain (Loss) Reclassified from Accumulated Other Comprehensive Loss Accumulated Other Comprehensive Income (Loss) End of the Year Foreign currency sales contracts – cash flow hedges $ 0 $ 0 $ 0 $ 0 Foreign currency purchase contracts 216 0 31 185 Future contracts – copper and aluminum 335 804 639 500 Change in fair value $ 551 $ 804 $ 670 $ 685 For the Year Ended December 31, 2016 Foreign currency sales contracts – cash flow hedges $ 4 $ 0 $ 4 $ 0 Foreign currency purchase contracts 241 0 25 216 Future contracts – copper and aluminum (200 ) 398 (137 ) 335 Change in fair value $ 45 $ 398 $ (108 ) $ 551 For the Year Ended December 31, 2015 Foreign currency sales contracts – cash flow hedges $ 0 $ 14 $ 10 $ 4 Foreign currency purchase contracts 258 0 17 241 Future contracts – copper and aluminum (173 ) (489 ) (462 ) (200 ) Change in fair value $ 85 $ (475 ) $ (435 ) $ 45
Schedule Of Derivative Instruments Amount Of Change In Fair Value Reclassified Or Expected To Be Reclassified From Accumulated Other Comprehensive Income Loss To Earnings Table Text Block	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) in Statements Estimated to be Reclassified in the Next Year Ended December 31, of Operations 12 Months 2017 2016 2015 Foreign currency sales contracts – cash flow hedges Net sales $ 0 $ 0 $ 6 $ 17 Foreign currency purchase contracts Depreciation and amortization 27 31 27 27 Futures contracts – copper and aluminum Costs of products sold (excluding depreciation and amortization) 500 639 (220 ) (751 )

Fair Value (Tables)

Fair Value (Tables)	12 Months Ended
	Dec. 31, 2017
Fair Value Disclosures [Abstract]
Fair Value of Financial Assets and Liabilities	The following summarizes financial assets and liabilities reported at fair value on a recurring basis in the accompanying consolidated balance sheets at December 31: 2017 Quoted Prices in Active Markets for Identical Inputs (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) Total Investments Other noncurrent assets $ 4,204 $ 0 $ 0 $ 4,204 Foreign currency exchange contracts Other current assets 0 1,130 0 1,130 Other noncurrent assets 0 16 0 16 Other current liabilities 0 996 0 996 Other noncurrent liabilities 0 1 0 1 2016 Investments Other noncurrent assets $ 3,863 $ 0 $ 0 $ 3,863 Foreign currency exchange contracts Other current assets 0 1,022 0 1,022 Other noncurrent assets 0 47 0 47 Other current liabilities 0 1,173 0 1,173 Other noncurrent liabilities 0 40 0 40

Income Taxes (Tables)

Income Taxes (Tables)	12 Months Ended
	Dec. 31, 2017
Income Tax Disclosure [Abstract]
(Loss) Income Before Income Taxes and Equity Gains (Losses) in Joint Venture	(Loss) income before income taxes and equity gains (losses) in joint venture is comprised of the following: 2017 2016 2015 Domestic $ (16,988 ) $ (26,326 ) $ 6,000 Foreign 3,295 (31,194 ) (1,480 ) (Loss) income before income taxes and equity gains (losses) in joint venture $ (13,693 ) $ (57,520 ) $ 4,520
Income Tax (Benefit) Provision	The income tax (benefit) provision consisted of the following: 2017 2016 2015 Current: Federal $ (4,698 ) $ (1,574 ) $ 4,577 State (440 ) 465 378 Foreign 606 414 (20 ) Current income tax (benefit) provision (4,532 ) (695 ) 4,935 Deferred: Federal 1,259 (2,688 ) (2,203 ) State (112 ) (1,838 ) 197 Foreign 1,876 (2,472 ) (296 ) Increase in valuation allowance 154 30,405 0 Deferred income tax provision (benefit) 3,177 23,407 (2,302 ) Total income tax (benefit) provision $ (1,355 ) $ 22,712 $ 2,633
Difference Between Statutory U.S. Federal Income Tax and the Corporation's Effective Income Tax	The difference between statutory U.S. federal income tax and the Corporation’s effective income tax was as follows: 2017 2016 2015 Computed at statutory rate $ (4,428 ) $ (19,984 ) $ 1,402 Tax differential on non-U.S. earnings (389 ) 1,790 106 State income taxes (398 ) (1,535 ) 226 Manufacturers deduction (I.R.C. Section 199) 0 204 (433 ) Meals and entertainment 142 143 136 Tax credits 0 0 (243 ) Goodwill impairment 0 9,191 0 Increase in valuation allowance 154 30,405 0 Repatriation transition tax impact 3,284 0 0 Change in tax rates 0 1,913 224 Change in uncertain tax positions 0 114 91 Acquisition-related costs 0 571 981 Other – net 280 (100 ) 143 Total income tax (benefit) provision $ (1,355 ) $ 22,712 $ 2,633
Deferred Income Tax Assets and Liabilities	Deferred income tax assets and liabilities as of December 31, 2017, and 2016, are summarized below. 2017 2016 Assets: Employment – related liabilities $ 10,975 $ 18,659 Pension liability – foreign 1,633 2,241 Pension liability – domestic 9,004 16,133 Liabilities related to discontinued operations 186 241 Capital loss carryforwards 308 282 Asbestos-related liability 12,179 21,024 Net operating loss – domestic 674 653 Net operating loss – state 2,782 2,123 Net operating loss – foreign 22,856 19,106 Inventory related 2,764 2,157 Impairment charge associated with investment in MG 1,155 2,184 Investment tax credits – foreign 848 791 Other 3,181 6,660 Gross deferred income tax assets 68,545 92,254 Valuation allowance (1) (38,112 ) (45,449 ) 30,433 46,805 Liabilities: Depreciation (26,915 ) (37,584 ) Mark-to-market adjustment – derivatives (4 ) (187 ) Intangible assets – definite life (1,186 ) (2,067 ) Intangible assets – indefinite life (605 ) (731 ) Other (566 ) (2,003 ) Gross deferred income tax liabilities (29,276 ) (42,572 ) Net deferred income tax assets $ 1,157 $ 4,233 (1) The decrease in the valuation allowance in 2017 from 2016 is primarily due to the reduction in the U.S. corporate statutory income tax rate from 35% to 21%.
Summary of Changes in Unrecognized Tax Benefits	The following summarizes changes in unrecognized tax benefits for the year ended December 31: 2017 2016 2015 Balance at the beginning of the year $ 236 $ 315 $ 52 Gross increases for tax positions taken in the current year 0 0 0 Gross increases for tax positions taken in prior years 0 0 283 Gross decreases in tax positions due to lapse in statute of limitations (119 ) (79 ) (20 ) Gross decreases for tax positions taken in prior years 0 0 0 Gross decreases for tax settlements with taxing authorities 0 0 0 Balance at the end of the year $ 117 $ 236 $ 315

Litigation (Tables)

Litigation (Tables)	12 Months Ended
	Dec. 31, 2017
Text Block [Abstract]
Schedule of Loss Contingencies by Contingency	The following table reflects approximate information about the claims for Asbestos Liability against Air & Liquid and the Corporation for the two years ended December 31, 2017, and 2016: 2017 2016 Total claims pending at the beginning of the period 6,618 6,212 New claims served 1,365 1,452 Claims dismissed (718 ) (782 ) Claims settled (358 ) (264 ) Total claims pending at the end of the period (1) 6,907 6,618 Gross settlement and defense costs (in 000’s) $ 21,431 $ 17,960 Average gross settlement and defense costs per claim resolved (in 000’s) $ 19.92 $ 17.17 (1) Included as “open claims” are approximately 479 and 444 claims in 2017 and 2016, respectively, classified in various jurisdictions as “inactive” or transferred to a state or federal judicial panel on multi-district litigation, commonly referred to as the MDL.
Summary of Activity in Asbestos Insurance Recoveries	The following table summarizes activity relating to insurance recoveries for each of the years ended December 31, 2017, and 2016. 2017 2016 Insurance receivable – asbestos, beginning of the year $ 115,945 $ 125,423 Settlement and defense costs paid by insurance carriers (1) (15,603 ) (23,138 ) Changes in estimated coverage 0 13,660 Insurance receivable – asbestos, end of the year $ 100,342 $ 115,945 (1) Settlement and defense costs paid by insurance carriers for 2016 includes a lump sum cash settlement with an insurance carrier of $9,808.

Business Segments (Tables)

Business Segments (Tables)	12 Months Ended
	Dec. 31, 2017
Segment Reporting [Abstract]
Business Segment Net Sales and (Loss) Income before Income Taxes	The accounting policies are the same as those described in Note 1. Net Sales (Loss) Income Before Income Taxes and Equity Gains (Losses) in Joint Venture 2017 2016 2015 2017 2016 2015 Forged and Cast Engineered Products (1) $ 344,529 $ 247,652 $ 152,267 $ (1,826 ) $ (42,878 ) $ (3,444 ) Air and Liquid Processing (1) 87,872 84,214 86,213 10,427 5,123 23,166 Total Reportable Segments 432,401 331,866 238,480 8,601 (37,755 ) 19,722 Corporate costs, including other income (expense) 0 0 0 (22,294 ) (19,765 ) (15,202 ) Consolidated total $ 432,401 $ 331,866 $ 238,480 $ (13,693 ) $ (57,520 ) $ 4,520 Capital Expenditures Depreciation and Amortization Expense Identifiable Assets (2) 2017 2016 2015 2017 2016 2015 2017 2016 2015 Forged and Cast Engineered Products $ 14,165 $ 9,440 $ 8,608 $ 21,124 $ 19,166 $ 10,468 $ 414,227 $ 348,331 $ 228,718 Air and Liquid Processing 560 385 494 1,072 1,183 1,262 132,341 173,017 183,024 Corporate 174 741 305 191 114 57 19,031 44,541 94,414 $ 14,899 $ 10,566 $ 9,407 $ 22,387 $ 20,463 $ 11,787 $ 565,599 $ 565,889 $ 506,156 Net Sales (3) Long-Lived Assets (4) (Loss) Income Before Income Taxes and Equity Gains (Losses) in Joint Venture Geographic Areas: 2017 2016 2015 2017 2016 2015 2017 2016 2015 United States $ 236,856 $ 159,531 $ 126,417 $ 235,646 $ 206,460 $ 236,707 $ (18,122 ) $ (25,906 ) $ 5,855 Foreign 195,545 172,335 112,063 88,116 133,141 29,198 $ 4,429 (31,614 ) (1,335 ) $ 432,401 $ 331,866 $ 238,480 $ 323,762 $ 339,601 $ 265,905 $ (13,693 ) $ (57,520 ) $ 4,520 Net Sales by Product Line (5) 2017 2016 2015 Forged and cast mill rolls $ 254,638 $ 230,531 $ 129,499 Forged engineered products 89,891 17,121 22,768 Heat exchange coils 28,998 28,139 32,745 Centrifugal pumps 35,607 36,359 33,120 Air handling systems 23,267 19,716 20,348 $ 432,401 $ 331,866 $ 238,480 (1) (Loss) income before income taxes and equity gains (losses) in joint venture for the Forged and Cast Engineered Products segment for 2016 includes a pre-tax charge of $26,676 principally for the write-off of goodwill associated with the Forged and Cast Engineered Products reporting unit deemed to be impaired. (Loss) income before income taxes and equity gains (losses) in joint venture for the Air and Liquid Processing segment for 2016 includes pre-tax charge of $4,565 for estimated costs of asbestos-related litigation through 2026 net of estimated insurance recoveries and a settlement with an insurance carrier for an amount greater than originally estimated, and 2015 includes pre-tax asbestos-related proceeds of $14,333 received from two insurance carriers in rehabilitation. (2) Identifiable assets for the Forged and Cast Engineered Products segment include investments in joint ventures of $2,175, $2,019 and $3,097 at December 31, 2017, 2016 and 2015, respectively. The change in the identifiable assets of the Air and Liquid Processing segment relates primarily to the movement in asbestos-related insurance receivables, the balances of which equaled $100,342, $115,945 and $125,423 at December 31, 2017, 2016 and 2015, respectively. (3) Net sales are attributed to countries based on location of the customer. Sales to individual countries were less than 10% of consolidated net sales each of the years. (4) Foreign long-lived assets represent primarily assets of the U.K., Åkers and ASW operations. Long-lived assets of the U.S. include noncurrent asbestos-related insurance receivables of $87,342, $102,945 and $108,423 for 2017, 2016 and 2015, respectively. (5) For 2017, no customers within the Forged and Cast Engineered Products or the Air and Liquid Processing segments exceeded 10% of its net sales. For the Forged and Cast Engineered Product segment, two customers accounted for 24% and 33% of its net sales for 2016 and 2015, respectively. For the Air and Liquid Processing segment, one customer accounted for 10% of its net sales for 2016 and no customers exceeded 10% of net sales for 2015. One customer accounted for 11% of the Corporation’s consolidated sales in 2016.

Quarterly Information - Unaud48

Quarterly Information - Unaudited (Tables)	12 Months Ended
	Dec. 31, 2017
Quarterly Financial Information Disclosure [Abstract]
Quarterly Information	(in thousands, except per share amounts) First Quarter Second Quarter Third Quarter Fourth Quarter 2017 Net sales $ 103,516 $ 110,550 $ 103,886 $ 114,449 Gross profit (a) 18,853 18,533 16,591 20,752 Net loss attributable to Ampco-Pittsburgh (b) (4,783 ) (1,913 ) (2,202 ) (3,191 ) Net loss per common share attributable to Ampco-Pittsburgh: Basic (b) (0.39 ) (0.16 ) (0.18 ) (0.26 ) Diluted (b) (0.39 ) (0.16 ) (0.18 ) (0.26 ) Comprehensive (loss) income attributable to Ampco-Pittsburgh (1,808 ) 2,952 1,660 7,320 2016 Net sales $ 63,578 $ 93,301 $ 82,861 $ 92,126 Gross profit (a) 12,473 15,849 15,594 11,454 Net loss attributable to Ampco-Pittsburgh (c) (2,890 ) (6,486 ) (27,382 ) (43,062 ) Net loss per common share attributable to Ampco-Pittsburgh: Basic (c) (0.26 ) (0.53 ) (2.23 ) (3.51 ) Diluted (c) (0.26 ) (0.53 ) (2.23 ) (3.51 ) Comprehensive loss attributable to Ampco-Pittsburgh (d) (1,501 ) (10,739 ) (22,894 ) (47,972 ) (a) Gross profit excludes depreciation and amortization. (b) The fourth quarter of 2017 includes an unfavorable net impact of approximately $1,565 or $0.13 per common share related to the new U.S. Tax Cuts and Jobs Act legislation. (c) The second, third and fourth quarters of 2016 include valuation allowances of $1,419, $26,903 and $2,083, respectively, to recognize existing net deferred income tax assets to their estimated net realizable value. Fourth quarter of 2016 also includes an after-tax charge of $4,565 or $0.38 per common share for estimated costs of asbestos-related litigation through 2026, net of estimated insurance recoveries, and a settlement with an insurance carrier for an amount greater than originally estimated, and an after-tax charge of $26,676 or $2.23 per common share primarily for the write-off of goodwill in the Forged and Cast Engineered Products reporting unit deemed to be impaired. (d) Third quarter of 2016 includes an adjustment to recognize the effect of a plan amendment to one of its other postretirement benefit plans of $4,762. No income tax benefit was recognized due to the Corporation having a valuation allowance recorded against the deferred income tax assets for the jurisdiction affected by the plan amendment.

Description of Business - Addit

Description of Business - Additional Information (Detail) - Segment	12 Months Ended
	Dec. 31, 2017	Mar. 03, 2016
Schedule Of Description Of Business [Line Items]
Number of business segments	2
Akers AB [Member]
Schedule Of Description Of Business [Line Items]
Business acquisition, equity interest acquired		100.00%
Chinese Joint Venture Company [Member] | Akers AB [Member]
Schedule Of Description Of Business [Line Items]
Business acquisition, equity interest acquired		60.00%

Summary of Significant Accoun50

Summary of Significant Accounting Policies - Additional Information (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Schedule Of Significant Accounting Policies [Line Items]
Percentage of unrealized gains and losses used to determine market related value of plan asset	20.00%
Moving average period to determine market value of plan assets	5 years
Diluted	12,330,401	11,951,181	10,447,066
Accumulated other comprehensive loss reclassified to retained earnings	$ 0
Cumulative effect adjustment to retained earnings	600
Retained Earnings [Member]
Schedule Of Significant Accounting Policies [Line Items]
Accumulated other comprehensive loss reclassified to retained earnings	$ 6,088
Stock Option [Member]
Schedule Of Significant Accounting Policies [Line Items]
Weighted average outstanding stock options	1,013,008	1,163,396	1,138,287
Restricted Stock Units (RSUs) [Member]
Schedule Of Significant Accounting Policies [Line Items]
Vesting period, years	3 years
Stock Option [Member]
Schedule Of Significant Accounting Policies [Line Items]
Vesting period, years	3 years
Minimum [Member]
Schedule Of Significant Accounting Policies [Line Items]
Investments in joint ventures	20.00%
Defined benefit plan actuarial gain loss percentage	10.00%
Minimum [Member] | Land and Land Improvements [Member]
Schedule Of Significant Accounting Policies [Line Items]
Property, plant and equipment, estimated useful life	15 years
Minimum [Member] | Buildings [Member]
Schedule Of Significant Accounting Policies [Line Items]
Property, plant and equipment, estimated useful life	25 years
Minimum [Member] | Machinery and Equipment [Member]
Schedule Of Significant Accounting Policies [Line Items]
Property, plant and equipment, estimated useful life	3 years
Maximum [Member]
Schedule Of Significant Accounting Policies [Line Items]
Investments in joint ventures	50.00%
Defined benefit plan actuarial gain loss percentage	10.00%
Maximum [Member] | Land and Land Improvements [Member]
Schedule Of Significant Accounting Policies [Line Items]
Property, plant and equipment, estimated useful life	20 years
Maximum [Member] | Buildings [Member]
Schedule Of Significant Accounting Policies [Line Items]
Property, plant and equipment, estimated useful life	50 years
Maximum [Member] | Machinery and Equipment [Member]
Schedule Of Significant Accounting Policies [Line Items]
Property, plant and equipment, estimated useful life	25 years

Acquisitions - Additional Infor

Acquisitions - Additional Information (Detail) - USD ($) $ in Thousands	Nov. 01, 2016	Mar. 03, 2016	Jul. 29, 2015	Dec. 31, 2016	Dec. 31, 2016	Dec. 31, 2016	Dec. 31, 2015
Business Acquisition [Line Items]
Purchase price in the form of cash			$ 5,000
Akers AB [Member]
Business Acquisition [Line Items]
Business acquisition, equity interest acquired		100.00%
Total base purchase price		$ 74,155
Purchase price in the form of cash		29,399
Purchase price in the form of three-year promissory note		$ 22,619
Purchase price in the form of shares		1,776,604
Business acquisition, fair value		$ 22,137
Business acquisition, net sales					$ 121,079
Business acquisition, loss before income taxes					$ 10,130
Forged and Cast Engineered Products [Member]
Business Acquisition [Line Items]
Impairment of goodwill						$ 26,261
ASW Steel Inc [Member]
Business Acquisition [Line Items]
Business acquisition, equity interest acquired	100.00%
Total base purchase price	$ 3,500
Purchase price in the form of cash	3,500
Business acquisition, net sales				$ 7,523
Business acquisition, loss before income taxes				$ (1,781)
Total purchase price	13,116
Outstanding indebtedness	$ 9,616
Akers Ab and ASW Steel Inc [Member]
Business Acquisition [Line Items]
Acquisition-related transaction costs						$ 3,056	$ 3,383

Acquisitions - Summary of Fair

Acquisitions - Summary of Fair Value of Assets Acquired and Liabilities Assumed (Detail) - USD ($) $ in Thousands	Nov. 01, 2016	Mar. 03, 2016
Akers AB [Member]
Business Acquisition [Line Items]
Current assets (excluding inventories)		$ 41,703
Inventories		30,332
Property, plant and equipment		71,871
Intangible assets		11,784
Other noncurrent assets		8,068
Current liabilities		(71,690)
Noncurrent liabilities		(43,153)
Net assets acquired		48,915
Noncontrolling interest		(2,019)
Goodwill		27,259
Base purchase price		$ 74,155
ASW Steel Inc [Member]
Business Acquisition [Line Items]
Current assets (excluding inventories)	$ 6,525
Inventories	6,956
Property, plant and equipment	10,310
Current liabilities	(10,675)
Base purchase price	3,500
Outstanding indebtedness	$ (9,616)

Acquisitions - Summary of Pro F

Acquisitions - Summary of Pro Forma Financial Information (Detail) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Business Acquisition [Line Items]
Net loss attributable to Ampco-Pittsburgh	$ (85,778)	$ (24,740)
Net loss per common share (basic) attributable to Ampco-Pittsburgh	$ (6.94)	$ (2.03)
Akers AB [Member]
Business Acquisition [Line Items]
Net sales	$ 393,243	$ 440,265
Loss before income taxes (includes noncontrolling interest)	$ (63,498)	$ (11,945)

Investments in Joint Ventures -

Investments in Joint Ventures - Additional Information (Detail) - USD ($)	1 Months Ended	12 Months Ended
	Nov. 30, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2007
Schedule of Investments [Line Items]
Proceeds from sale of investment in joint venture		$ 1,500,000	$ 0	$ 0
ATR [Member] | Akers AB [Member]
Schedule of Investments [Line Items]
Ownership interest percentage		59.88%
ATR [Member] | TISCO [Member]
Schedule of Investments [Line Items]
Ownership interest by minority holder		40.12%
UES [Member]
Schedule of Investments [Line Items]
Percentage of ownership in joint venture					49.00%
Cash payment for joint venture					$ 14,700,000
Percentage of equity sold	16.00%
Amount of equity method investment sold	$ 2,400,000
Period of payment for equity interest sold	3 years
Proceeds from sale of investment in joint venture		$ 1,500,000
Recorded cost		835,000
Dividend declared		$ 0	0	0
Maanshan [Member]
Schedule of Investments [Line Items]
Ownership interest percentage		51.00%
Gongchang [Member]
Schedule of Investments [Line Items]
Recorded cost		$ 1,340,000
Dividend declared		$ 0	$ 395,000	$ 0
Percentage of ownership in Gongchang		24.00%

Inventories - Schedule of Inven

Inventories - Schedule of Inventories (Detail) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Inventory Disclosure [Abstract]
Raw materials	$ 24,249	$ 23,964
Work-in-progress	42,840	29,198
Finished goods	24,083	20,046
Supplies	16,389	10,371
Inventories	$ 107,561	$ 83,579

Inventories - Additional Inform

Inventories - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Inventory Disclosure [Abstract]
Percentage of inventories valued on the LIFO method	42.00%	45.00%
The LIFO reserve approximated	$ (16,063)	$ (15,139)
Income tax expense recognized related to liquidation	0	0
Decrease in costs of products sold	490	936	$ 216
Net income	$ 490	$ 936	$ 141
Common per share	$ 0.04	$ 0.08	$ 0.01

Property, Plant and Equipment -

Property, Plant and Equipment - Schedule of Property, Plant and Equipment (Detail) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Property Plant And Equipment [Line Items]
Property, plant and equipment, Gross	$ 433,352	$ 411,538
Accumulated depreciation	(218,372)	(197,130)
Property, plant and equipment, net	214,980	214,408
Land and Land Improvements [Member]
Property Plant And Equipment [Line Items]
Property, plant and equipment, Gross	12,172	11,747
Buildings [Member]
Property Plant And Equipment [Line Items]
Property, plant and equipment, Gross	68,572	66,017
Machinery and Equipment [Member]
Property Plant And Equipment [Line Items]
Property, plant and equipment, Gross	340,396	323,684
Construction-in-Process [Member]
Property Plant And Equipment [Line Items]
Property, plant and equipment, Gross	5,019	2,595
Other [Member]
Property Plant And Equipment [Line Items]
Property, plant and equipment, Gross	$ 7,193	$ 7,495

Property, Plant and Equipment58

Property, Plant and Equipment - Additional Information (Detail) € in Thousands, $ in Thousands	Dec. 31, 2017USD ($)	Dec. 31, 2017EUR (€)	Dec. 31, 2016USD ($)
Property Plant And Equipment [Abstract]
Land and Building	$ 2,831	€ 2,098
Capital leased assets gross value	4,082		$ 3,610
Capital lease, lease related accumulated amortization	$ 1,101		$ 691

Intangible Assets - Schedule of

Intangible Assets - Schedule of Intangible Assets (Detail) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Finite and Indefinite Lived Intangible Assets [Line Items]
Intangible assets, Trade name	$ 2,696	$ 2,537
Intangible assets, gross	13,668	13,029
Accumulated amortization	(2,647)	(1,428)
Intangible assets, net	11,021	11,601	$ 1,193
Customer Relationships [Member]
Finite and Indefinite Lived Intangible Assets [Line Items]
Intangible assets, gross	6,543	6,244
Developed Technology [Member]
Finite and Indefinite Lived Intangible Assets [Line Items]
Intangible assets, gross	$ 4,429	$ 4,248

Intangible Assets - Summary of

Intangible Assets - Summary of Changes in Intangible Assets (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Intangible Assets Net Excluding Goodwill [Abstract]
Balance at the beginning of the year	$ 11,601	$ 1,193
Changes in intangible assets	0	11,784
Amortization of intangible assets	(1,219)	(1,106)
Other, primarily impact from changes in foreign currency exchange rates	639	(270)
Balance at the end of the year	$ 11,021	$ 11,601

Intangible Assets - Additional

Intangible Assets - Additional Information (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Goodwill [Line Items]
Indefinite-lived trade name	$ 2,696	$ 2,537
Akers AB [Member]
Goodwill [Line Items]
Indefinite-lived trade name	$ 2,696	$ 2,537
Identifiable intangible assets, weighted average amortization period	12 years
Identifiable intangible assets expected amortization in 2018	$ 1,248
Identifiable intangible assets expected amortization in 2019	1,248
Identifiable intangible assets expected amortization in 2020	1,248
Identifiable intangible assets expected amortization in 2021	541
Identifiable intangible assets expected amortization in 2022	400
Identifiable intangible assets expected amortization, thereafter	$ 3,640

Other Current Liabilities - Sch

Other Current Liabilities - Schedule of Other Current Liabilities (Detail) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Other Liabilities Disclosure [Abstract]
Customer-related liabilities	$ 18,512	$ 21,564
Accrued interest payable	2,697	2,274
Accrued sales commissions	2,301	1,693
Other	13,579	16,666
Other current liabilities	$ 37,089	$ 42,197

Other Current Liabilities - S63

Other Current Liabilities - Schedule of Changes in Liability for Product Warranty Claims (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Other Liabilities Disclosure [Abstract]
Balance at the beginning of the year	$ 11,521	$ 6,358	$ 6,672
Acquisitions – opening balance sheet liability for warranty claims	0	7,130	0
Satisfaction of warranty claims	(4,014)	(4,297)	(2,452)
Provision for warranty claims	3,601	3,282	2,293
Other, primarily impact from changes in foreign currency exchange rates	594	(952)	(155)
Balance at the end of the year	$ 11,702	$ 11,521	$ 6,358

Borrowing Arrangements - Additi

Borrowing Arrangements - Additional Information (Detail) € in Thousands, ¥ in Thousands, £ in Thousands	May 20, 2016USD ($)	Dec. 31, 2017USD ($)	Dec. 31, 2016USD ($)	Dec. 31, 2015USD ($)	Dec. 31, 2017EUR (€)	Dec. 31, 2017GBP (£)	Dec. 31, 2017CNY (¥)	Mar. 02, 2017USD ($)
Line Of Credit Facility [Line Items]
Agreement borrowing capacity		$ 800,000			€ 400	£ 250
Credit amount outstanding		0	$ 0
Future principal payments, next twelve months		19,335,000
Future principal payments, in year two		25,844,000
Future principal payments, in year three		344,000
Future principal payments, in year four		20,585,000
Future principal payments, in year five		45,000
Deferred financing fees		1,250,000
Issuance of debt to acquire net assets of Åkers (Note 2)		0	22,619,000	$ 0
Accrued interest		2,697,000	2,274,000
Industrial Revenue Bonds ("IRB") [Member]
Line Of Credit Facility [Line Items]
Long term debt		13,311,000	13,311,000
Promissory Notes (and Interest) [Member]
Line Of Credit Facility [Line Items]
Long term debt		$ 25,395,000	23,844,000
Debt, interest rate		6.50%			6.50%	6.50%	6.50%
Accrued interest		$ 2,776,000
Debt, maturity date		Mar. 3, 2019
Promissory Notes (and Interest) [Member] | Akers AB [Member]
Line Of Credit Facility [Line Items]
Issuance of debt to acquire net assets of Åkers (Note 2)		$ 22,619,000
Minority Shareholder Loan [Member]
Line Of Credit Facility [Line Items]
Long term debt		$ 5,325,000	4,990,000				¥ 34,655
Debt, interest rate		5.00%			5.00%	5.00%	5.00%
Accrued interest		$ 2,682,000					¥ 17,457
Minimum [Member] | Capital Leases [Member]
Line Of Credit Facility [Line Items]
Effective interest rate		1.30%			1.30%	1.30%	1.30%
Maximum [Member] | Capital Leases [Member]
Line Of Credit Facility [Line Items]
Effective interest rate		5.20%			5.20%	5.20%	5.20%
Tax Exempt Industrial Revenue Bond One [Member] | Industrial Revenue Bonds ("IRB") [Member]
Line Of Credit Facility [Line Items]
Tax-exempt IRB maturing in 2020/2027/2029		$ 4,120,000
Interest at a floating rate on tax-exempt IRB maturing in 2020/2027/2029		0.91%			0.91%	0.91%	0.91%
Taxable Industrial Revenue Bond [Member] | Industrial Revenue Bonds ("IRB") [Member]
Line Of Credit Facility [Line Items]
Tax-exempt IRB maturing in 2020/2027/2029		$ 7,116,000
Interest at a floating rate on tax-exempt IRB maturing in 2020/2027/2029		1.17%			1.17%	1.17%	1.17%
Tax Exempt Industrial Revenue Bond Two [Member] | Industrial Revenue Bonds ("IRB") [Member]
Line Of Credit Facility [Line Items]
Tax-exempt IRB maturing in 2020/2027/2029		$ 2,075,000
Interest at a floating rate on tax-exempt IRB maturing in 2020/2027/2029		0.79%			0.79%	0.79%	0.79%
Revolving Credit and Security Agreement [Member]
Line Of Credit Facility [Line Items]
Initial term of credit facility	5 years
Agreement borrowing capacity	$ 100,000,000
Additional borrowing capacity	$ 50,000,000
Long term debt		$ 20,349,000	$ 0
Interest on outstanding balance		2.75%
Line of credit, remaining borrowing capacity		$ 56,000,000
Revolving Credit and Security Agreement [Member] | Minimum [Member]
Line Of Credit Facility [Line Items]
Commitment fee payable percentage	0.25%
Revolving Credit and Security Agreement [Member] | Maximum [Member]
Line Of Credit Facility [Line Items]
Commitment fee payable percentage	0.375%
Fixed charge coverage ratio		1			1	1	1
Revolving Credit and Security Agreement [Member] | London Interbank Offered Rate (LIBOR) [Member]
Line Of Credit Facility [Line Items]
Debt instrument description of interest rate		LIBOR plus an applicable margin ranging between 1.25% to 1.75%
Revolving Credit and Security Agreement [Member] | London Interbank Offered Rate (LIBOR) [Member] | Minimum [Member]
Line Of Credit Facility [Line Items]
Debt instrument basis spread	1.25%
Revolving Credit and Security Agreement [Member] | London Interbank Offered Rate (LIBOR) [Member] | Maximum [Member]
Line Of Credit Facility [Line Items]
Debt instrument basis spread	1.75%
Revolving Credit and Security Agreement [Member] | Base Rate [Member]
Line Of Credit Facility [Line Items]
Debt instrument description of interest rate		the base rate plus an applicable margin ranging between 0.25% to 0.75%
Revolving Credit and Security Agreement [Member] | Base Rate [Member] | Minimum [Member]
Line Of Credit Facility [Line Items]
Debt instrument basis spread	0.25%
Revolving Credit and Security Agreement [Member] | Base Rate [Member] | Maximum [Member]
Line Of Credit Facility [Line Items]
Debt instrument basis spread	0.75%
Revolving Credit and Security Agreement [Member] | Letter of Credit [Member]
Line Of Credit Facility [Line Items]
Agreement borrowing capacity								$ 40,000,000
Revolving Credit and Security Agreement [Member] | European Credit Facility [Member]
Line Of Credit Facility [Line Items]
Agreement borrowing capacity								15,000,000
Long term debt | £						£ 1,000
Revolving Credit and Security Agreement [Member] | Canadian Credit Facility [Member]
Line Of Credit Facility [Line Items]
Agreement borrowing capacity								$ 15,000,000

Borrowing Arrangements - Schedu

Borrowing Arrangements - Schedule of Outstanding Borrowings (Detail) ¥ in Thousands	Dec. 31, 2017USD ($)	Dec. 31, 2017CNY (¥)	Dec. 31, 2016USD ($)
Debt Instrument [Line Items]
Capital leases	$ 1,773,000		$ 2,161,000
Outstanding borrowings	66,153,000		52,214,000
Debt – current portion	(19,335,000)		(26,825,000)
Long-term debt	46,818,000		25,389,000
Revolving Credit and Security Agreement [Member]
Debt Instrument [Line Items]
Long term debt	20,349,000		0
Credit Facility [Member]
Debt Instrument [Line Items]
Long term debt	0		7,146,000
Industrial Revenue Bonds [Member]
Debt Instrument [Line Items]
Long term debt	13,311,000		13,311,000
Promissory Notes (and Interest) [Member]
Debt Instrument [Line Items]
Long term debt	25,395,000		23,844,000
Minority Shareholder Loan [Member]
Debt Instrument [Line Items]
Long term debt	5,325,000	¥ 34,655	4,990,000
Term Loan [Member]
Debt Instrument [Line Items]
Long term debt	$ 0		$ 762,000

Pension and Other Postretirem66

Pension and Other Postretirement Benefits - Additional Information (Detail) £ in Thousands	12 Months Ended
	Dec. 31, 2017USD ($)Pension_PlanLocationEmployeeCustomer	Dec. 31, 2016USD ($)Pension_Plan	Dec. 31, 2015USD ($)	Dec. 31, 2017GBP (£)Pension_Plan	Dec. 31, 2016GBP (£)Pension_Plan
Defined Benefit Plans And Other Postretirement Benefit Plans [Line Items]
Lump sum distributions		$ 2,739,000
Defined benefit pension contribution plan, non-elective base contribution rate	3.00%
Number of employees participate in the plan | Employee	100,000
Multiemployer plan number of employees description	Approximately 100,000
Total amount of assets collected	$ 11,700,000,000
Percentage of funded status in excess	96.00%
Participation of corporation's employees in the plan	Less than 100
Participation of number of corporation's employees in the plan | Employee	100
Corporation's contributions	$ 250,000	$ 250,000	$ 250,000
Percentage of employers contributions	5.00%
Contributions expected in 2018	$ 250,000
Service period to avail existing pension plan	15 years
Maximum maturity period of fixed income investments	10 years
Investments in diversified portfolio	Invests primarily in a diversified portfolio of fixed-income securities of varying maturities or in commingled funds which invest in a diversified portfolio of fixed-income securities of varying maturities.
Target allocation	Generate a minimum annual inflation adjusted return of 5% and outperform a traditional 70/30 equities/bond portfolio.
High-quality fixed-income investments maturity	10 years
Assumed health care cost trend rate for 2017		6.00%			6.00%
Maximum [Member]
Defined Benefit Plans And Other Postretirement Benefit Plans [Line Items]
Defined benefit pension contribution plan, matching contribution rate	4.00%
Defined benefit plan actuarial gain loss percentage	10.00%			10.00%
Minimum [Member]
Defined Benefit Plans And Other Postretirement Benefit Plans [Line Items]
Defined benefit plan actuarial gain loss percentage	10.00%			10.00%
Minimum [Member] | Multi-Employer Plan [Member]
Defined Benefit Plans And Other Postretirement Benefit Plans [Line Items]
Number of employer locations contributed to the plan | Location	1,650
Akers AB [Member]
Defined Benefit Plans And Other Postretirement Benefit Plans [Line Items]
Employer non-elective contributions, percentage of employee compensation	3.00%
Reduction in pension liability due to exit from defined benefit plan		$ 1,181,000
Curtailment gain (loss)		887,000
Remeasurement of Pension Plan Liability [Member] | Electric Steel Corporation Carnegie [Member]
Defined Benefit Plans And Other Postretirement Benefit Plans [Line Items]
Curtailment gain (loss)			(1,303,000)
Nonqualified Defined Benefit Pension Plan [Member]
Defined Benefit Plans And Other Postretirement Benefit Plans [Line Items]
Minimum contributions expected in 2018	$ 0
Estimated benefit payments, in 2018	440,000
Estimated benefit payments, in 2019	454,000
Estimated benefit payments, in 2020	464,000
Estimated benefit payments, in 2021	485,000
Estimated benefit payments, in 2022	507,000
Estimated benefit payments, in 2023-2027	2,570,000
Accumulated benefit obligations	7,202,000	6,639,000
Defined benefit plan contribution made to trusts	0		0
Fair market value included in other noncurrent assets	4,204,000	3,863,000
Other Postretirement Benefit Plans [Member]
Defined Benefit Plans And Other Postretirement Benefit Plans [Line Items]
Curtailment gain (loss)	0	0	0
Lump sum distributions	0	0
Estimated benefit payments, in 2018	1,383,000
Estimated benefit payments, in 2019	1,407,000
Estimated benefit payments, in 2020	1,429,000
Estimated benefit payments, in 2021	1,239,000
Estimated benefit payments, in 2022	1,201,000
Estimated benefit payments, in 2023-2027	5,363,000
Fair value of plan assets	0	0	0
Voluntary contributions made	1,138,000	1,391,000
Projected benefit obligations	$ 0	17,467,000
Number of subsidiary having postretirement health care benefits | Customer	1
Monthly reimbursement period	5 years
Reduction in plan liability	$ 165,000	$ (4,762,000)
Percentage decrease in other postretirement benefits in 2018		4.75%			4.75%
Year related to decrease in health care cost trend rate		2,020
Percentage point increase or decrease in the assumed health care cost trend rate		1.00%
Other Postretirement Benefit Plans [Member] | Akers AB [Member]
Defined Benefit Plans And Other Postretirement Benefit Plans [Line Items]
Number of defined benefit pension plans | Pension_Plan		2			2
Other Postretirement Benefit Plans [Member] | Akers AB [Member] | Maximum [Member]
Defined Benefit Plans And Other Postretirement Benefit Plans [Line Items]
Amortization period of pension liability		12 years
Other Postretirement Benefit Plans [Member] | Akers AB [Member] | Minimum [Member]
Defined Benefit Plans And Other Postretirement Benefit Plans [Line Items]
Amortization period of pension liability		7 years 6 months
U.S. [Member] | Defined Benefit Pension Plan [Member]
Defined Benefit Plans And Other Postretirement Benefit Plans [Line Items]
Number of defined benefit pension plans | Pension_Plan	1			1
Minimum contributions required	$ 0
Minimum contributions expected in 2018	1,300,000
Estimated benefit payments, in 2018	13,672,000
Estimated benefit payments, in 2019	14,091,000
Estimated benefit payments, in 2020	14,301,000
Estimated benefit payments, in 2021	14,566,000
Estimated benefit payments, in 2022	14,685,000
Estimated benefit payments, in 2023-2027	74,009,000
Fair value of plan assets	199,138,000	$ 188,722,000
Accumulated benefit obligations	245,317,000	235,299,000
U.S. [Member] | Defined Benefit Pension Plan [Member] | Ampco Pittsburgh [Member]
Defined Benefit Plans And Other Postretirement Benefit Plans [Line Items]
Minimum contributions expected in 2018	2,808,000
Voluntary contributions made	$ 2,588,000	2,466,000	882,000
U.S. [Member] | Defined Benefit Pension Plan [Member] | Akers AB [Member]
Defined Benefit Plans And Other Postretirement Benefit Plans [Line Items]
Number of defined benefit pension plans | Pension_Plan	2			2
Foreign Pension Benefits [Member]
Defined Benefit Plans And Other Postretirement Benefit Plans [Line Items]
Estimated benefit payments, in 2018	$ 1,644,000
Estimated benefit payments, in 2019	1,903,000
Estimated benefit payments, in 2020	1,768,000
Estimated benefit payments, in 2021	1,738,000
Estimated benefit payments, in 2022	1,670,000
Estimated benefit payments, in 2023-2027	11,196,000
Fair value of plan assets	56,419,000	48,055,000		£ 41,820	£ 38,955
Accumulated benefit obligations	57,540,000	61,277,000		£ 42,650	£ 49,673
Voluntary contributions made	1,521,000	1,522,000	1,715,000
Defined contribution plan expected to be fully funded	850,000
Contributions to defined contribution pension plan	311,000	252,000	382,000
Contributions to the defined contribution pension plan expected in 2018	$ 379,000
Foreign Pension Benefits [Member] | Akers AB [Member]
Defined Benefit Plans And Other Postretirement Benefit Plans [Line Items]
Number of defined benefit pension plans | Pension_Plan	2			2
Estimated benefit payments, in 2018	$ 234,000
Estimated benefit payments, in 2019	257,000
Estimated benefit payments, in 2020	248,000
Estimated benefit payments, in 2021	249,000
Estimated benefit payments, in 2022	240,000
Estimated benefit payments, in 2023-2027	1,379,000
Accumulated benefit obligations	7,073,000	5,633,000
Projected benefit obligations	7,073,000	5,633,000
Foreign Pension Benefits [Member] | Defined Benefit Pension Plan [Member]
Defined Benefit Plans And Other Postretirement Benefit Plans [Line Items]
Curtailment gain (loss)	0	0	0
Lump sum distributions	0	0
Fair value of plan assets	56,419,000	48,055,000	$ 49,628,000
Voluntary contributions made	1,979,000	1,687,000
Projected benefit obligations	0	5,393,000
Reduction in plan liability	$ 0	$ 0

Pension and Other Postretirem67

Pension and Other Postretirement Benefits - Schedule of Changes in Projected Benefit Obligations (PBO) (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Change in projected benefit obligations:
Plan settlements		$ (2,739)
Defined Benefit Pension Plan [Member] | U.S. Defined Benefit Pension Plans [Member] | U.S. [Member]
Change in projected benefit obligations:
PBO, beginning balance	$ 244,440	181,803
Åkers acquisition – PBO at March 3	0	68,081
Service cost	1,651	1,714	$ 2,743
Interest cost	8,413	9,977	7,990
Plan amendments	0	0
Plan settlements	0	(2,739)
Plan curtailments	0	(1,181)
Foreign currency exchange rate changes	0	0
Actuarial loss (gain)	13,825	(160)
Participant contributions	0	0
Benefits paid from plan assets	(12,950)	(12,679)
Benefits paid by the Corporation	(403)	(376)
PBO, Ending balance	254,976	244,440	181,803
Defined Benefit Pension Plan [Member] | Foreign Pension Benefits [Member]
Change in projected benefit obligations:
PBO, beginning balance	66,910	63,750
Åkers acquisition – PBO at March 3	0	5,393
Service cost	150	314	0
Interest cost	1,845	2,250	2,394
Plan amendments	0	0
Plan settlements	0	0
Plan curtailments	0	0
Foreign currency exchange rate changes	5,948	(11,477)
Actuarial loss (gain)	(7,954)	8,869
Participant contributions	0	0
Benefits paid from plan assets	(1,813)	(2,189)
Benefits paid by the Corporation	(473)	0
PBO, Ending balance	64,613	66,910	63,750
Other Postretirement Benefit Plans [Member]
Change in projected benefit obligations:
PBO, beginning balance	19,059	8,117
Åkers acquisition – PBO at March 3	0	17,467
Service cost	492	504	384
Interest cost	571	722	474
Plan amendments	165	(4,762)
Plan settlements	0	0
Plan curtailments	0	0
Foreign currency exchange rate changes	0	0
Actuarial loss (gain)	(2,170)	(1,598)
Participant contributions	92	80
Benefits paid from plan assets	0	0
Benefits paid by the Corporation	(1,230)	(1,471)
PBO, Ending balance	$ 16,979	$ 19,059	$ 8,117

Pension and Other Postretirem68

Pension and Other Postretirement Benefits - Schedule of Changes in Plan Assets (Detail) £ in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2017USD ($)	Dec. 31, 2017GBP (£)	Dec. 31, 2016USD ($)	Dec. 31, 2015USD ($)
Foreign Pension Benefits [Member]
Change in plan assets:
Fair value of plan assets, Beginning balance	$ 48,055	£ 38,955
Corporate contributions	1,521		$ 1,522	$ 1,715
Fair value of plan assets, Ending balance	56,419	£ 41,820	48,055
Defined Benefit Pension Plan [Member] | U.S. Defined Benefit Pension Plans [Member]
Change in plan assets:
Fair value of plan assets, Beginning balance	188,722
Fair value of plan assets, Ending balance	199,138		188,722
Defined Benefit Pension Plan [Member] | U.S. Defined Benefit Pension Plans [Member] | U.S. [Member]
Change in plan assets:
Fair value of plan assets, Beginning balance	188,722		139,376
Åkers acquisition – fair value of plan assets at March 3	0		50,108
Actual return on plan assets	23,366		14,656
Foreign currency exchange rate changes	0		0
Corporate contributions	403		376
Participant contributions	0		0
Plan settlements	0		(2,739)
Gross benefits paid	(13,353)		(13,055)
Fair value of plan assets, Ending balance	199,138		188,722	139,376
Defined Benefit Pension Plan [Member] | Foreign Pension Benefits [Member]
Change in plan assets:
Fair value of plan assets, Beginning balance	48,055		49,628
Åkers acquisition – fair value of plan assets at March 3	0		0
Actual return on plan assets	3,998		7,859
Foreign currency exchange rate changes	4,673		(8,930)
Corporate contributions	1,979		1,687
Participant contributions	0		0
Plan settlements	0		0
Gross benefits paid	(2,286)		(2,189)
Fair value of plan assets, Ending balance	56,419		48,055	49,628
Other Postretirement Benefit Plans [Member]
Change in plan assets:
Fair value of plan assets, Beginning balance	0		0
Åkers acquisition – fair value of plan assets at March 3	0		0
Actual return on plan assets	0		0
Foreign currency exchange rate changes	0		0
Corporate contributions	1,138		1,391
Participant contributions	92		80
Plan settlements	0		0
Gross benefits paid	(1,230)		(1,471)
Fair value of plan assets, Ending balance	$ 0		$ 0	$ 0

Pension and Other Postretirem69

Pension and Other Postretirement Benefits - Schedule of Net Funded Status of the Plans (Detail) £ in Thousands, $ in Thousands	Dec. 31, 2017USD ($)	Dec. 31, 2017GBP (£)	Dec. 31, 2016USD ($)	Dec. 31, 2016GBP (£)	Dec. 31, 2015USD ($)
Foreign Pension Benefits [Member]
Funded status of the plans:
Fair value of plan assets	$ 56,419	£ 41,820	$ 48,055	£ 38,955
Defined Benefit Pension Plan [Member] | U.S. Defined Benefit Pension Plans [Member]
Funded status of the plans:
Fair value of plan assets	199,138		188,722
Defined Benefit Pension Plan [Member] | U.S. Defined Benefit Pension Plans [Member] | U.S. [Member]
Funded status of the plans:
Fair value of plan assets	199,138		188,722		$ 139,376
Less benefit obligations	254,976		244,440		181,803
Funded status at December 31	(55,838)		(55,718)
Defined Benefit Pension Plan [Member] | Foreign Pension Benefits [Member]
Funded status of the plans:
Fair value of plan assets	56,419		48,055		49,628
Less benefit obligations	64,613		66,910		63,750
Funded status at December 31	(8,194)		(18,855)
Other Postretirement Benefit Plans [Member]
Funded status of the plans:
Fair value of plan assets	0		0		0
Less benefit obligations	16,979		19,059		$ 8,117
Funded status at December 31	$ (16,979)		$ (19,059)

Pension and Other Postretirem70

Pension and Other Postretirement Benefits - Summary of Amounts Recognized in the Consolidated Balance Sheets (Detail) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Employee benefit obligations:
Employee benefit obligations	$ (79,750)	$ (91,947)
Defined Benefit Pension Plan [Member] | U.S. Defined Benefit Pension Plans [Member] | U.S. [Member]
Employee benefit obligations:
Accrued payrolls and employee benefits	(432)	(409)
Employee benefit obligations	(55,406)	(55,309)
Employee benefit obligations current and non current	(55,838)	(55,718)
Defined Benefit Pension Plan [Member] | Foreign Pension Benefits [Member]
Employee benefit obligations:
Accrued payrolls and employee benefits	0	0
Employee benefit obligations	(8,194)	(18,855)
Employee benefit obligations current and non current	(8,194)	(18,855)
Other Postretirement Benefit Plans [Member]
Employee benefit obligations:
Accrued payrolls and employee benefits	(1,371)	(1,276)
Employee benefit obligations	(15,608)	(17,783)
Employee benefit obligations current and non current	$ (16,979)	$ (19,059)

Pension and Other Postretirem71

Pension and Other Postretirement Benefits - Schedule of Accumulated Other Comprehensive Loss (Detail) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Defined Benefit Pension Plan [Member] | U.S. Defined Benefit Pension Plans [Member] | U.S. [Member]
Accumulated other comprehensive loss:
Net actuarial loss (gain)	$ 47,252	$ 48,153
Prior service cost (credit)	156	209
Total	47,408	48,362
Defined Benefit Pension Plan [Member] | Foreign Pension Benefits [Member]
Accumulated other comprehensive loss:
Net actuarial loss (gain)	25,914	25,547
Prior service cost (credit)	(9,174)	0
Total	16,740	25,547
Other Postretirement Benefit Plans [Member]
Accumulated other comprehensive loss:
Net actuarial loss (gain)	(1,211)	936
Prior service cost (credit)	(13,809)	(15,581)
Total	$ (15,020)	$ (14,645)

Pension and Other Postretirem72

Pension and Other Postretirement Benefits - Amounts Included in Accumulated Other Comprehensive Loss to be Recognized over Next Year (Detail) $ in Thousands	Dec. 31, 2017USD ($)
Defined Benefit Pension Plan [Member] | U.S. Defined Benefit Pension Plans [Member] | U.S. [Member]
Defined Benefit Plan Disclosure [Line Items]
Net actuarial loss (gain)	$ 1,763
Prior service cost (credit)	52
Total amounts included in accumulated other comprehensive loss to be recognized over next year	1,815
Defined Benefit Pension Plan [Member] | Foreign Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Net actuarial loss (gain)	784
Prior service cost (credit)	(324)
Total amounts included in accumulated other comprehensive loss to be recognized over next year	460
Other Postretirement Benefit Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Net actuarial loss (gain)	(109)
Prior service cost (credit)	(1,607)
Total amounts included in accumulated other comprehensive loss to be recognized over next year	$ (1,716)

Pension and Other Postretirem73

Pension and Other Postretirement Benefits - Summary of Target Asset Allocations and Major Asset Categories (Detail) - Defined Benefit Pension Plan [Member]	Dec. 31, 2017	Dec. 31, 2016
Equity Securities [Member] | U.S. Defined Benefit Pension Plans [Member] | U.S. [Member]
Defined Benefit Plan Disclosure [Line Items]
Percentage of Plan Assets	58.00%	47.00%
Target Allocation	60.00%
Equity Securities [Member] | Foreign Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Percentage of Plan Assets	49.00%	48.00%
Target Allocation		44.00%
Fixed Income Securities [Member] | U.S. Defined Benefit Pension Plans [Member] | U.S. [Member]
Defined Benefit Plan Disclosure [Line Items]
Percentage of Plan Assets	21.00%	21.00%
Target Allocation	20.00%
Fixed Income Securities [Member] | Foreign Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Percentage of Plan Assets	33.00%	34.00%
Target Allocation		35.00%
Alternative Investments [Member] | U.S. Defined Benefit Pension Plans [Member] | U.S. [Member]
Defined Benefit Plan Disclosure [Line Items]
Percentage of Plan Assets	16.00%	8.00%
Target Allocation	15.00%
Alternative Investments [Member] | Foreign Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Percentage of Plan Assets	17.00%	18.00%
Target Allocation		21.00%
Other (Primarily Cash and Cash Equivalents) [Member] | U.S. Defined Benefit Pension Plans [Member] | U.S. [Member]
Defined Benefit Plan Disclosure [Line Items]
Percentage of Plan Assets	5.00%	24.00%
Target Allocation	5.00%
Other (Primarily Cash and Cash Equivalents) [Member] | Foreign Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Percentage of Plan Assets	1.00%	0.00%
Target Allocation		0.00%

Pension and Other Postretirem74

Pension and Other Postretirement Benefits - Asset Categories Based on the Nature and Risks of the Plan Assets (Detail) £ in Thousands, $ in Thousands	Dec. 31, 2017USD ($)	Dec. 31, 2017GBP (£)	Dec. 31, 2016USD ($)	Dec. 31, 2016GBP (£)	Dec. 31, 2015USD ($)
Transportation [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Fair value of plan assets			$ 18
Wholesale Distribution [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Fair value of plan assets			16
Fixed Income Securities [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Fair value of plan assets	$ 37,587		36,601
Fixed Income Securities [Member] | Mutual Funds [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Fair value of plan assets	18,884		36,601
Fixed Income Securities [Member] | Corporate Bonds [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Fair value of plan assets	10,801
Fixed Income Securities [Member] | Treasury Bonds [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Fair value of plan assets	6,976
Fixed Income Securities [Member] | Agency Bonds [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Fair value of plan assets	926
Foreign Pension Benefits [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Fair value of plan assets	56,419	£ 41,820	48,055	£ 38,955
Defined Benefit Pension Plan [Member] | U.S. Defined Benefit Pension Plans [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Fair value of plan assets	199,138		188,722
Defined Benefit Pension Plan [Member] | U.S. Defined Benefit Pension Plans [Member] | U.S. [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Fair value of plan assets	199,138		188,722		$ 139,376
Defined Benefit Pension Plan [Member] | U.S. Defined Benefit Pension Plans [Member] | Equity Securities [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Fair value of plan assets	99,302		74,215
Defined Benefit Pension Plan [Member] | U.S. Defined Benefit Pension Plans [Member] | Equity Securities [Member] | U.S. [Member] | Consumer Discretionary [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Fair value of plan assets	637
Defined Benefit Pension Plan [Member] | U.S. Defined Benefit Pension Plans [Member] | Equity Securities [Member] | U.S. [Member] | Consumer Staples [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Fair value of plan assets	896
Defined Benefit Pension Plan [Member] | U.S. Defined Benefit Pension Plans [Member] | Equity Securities [Member] | U.S. [Member] | Energy [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Fair value of plan assets	427
Defined Benefit Pension Plan [Member] | U.S. Defined Benefit Pension Plans [Member] | Equity Securities [Member] | U.S. [Member] | Financial [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Fair value of plan assets	1,362
Defined Benefit Pension Plan [Member] | U.S. Defined Benefit Pension Plans [Member] | Equity Securities [Member] | U.S. [Member] | Health Care [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Fair value of plan assets	1,192		201
Defined Benefit Pension Plan [Member] | U.S. Defined Benefit Pension Plans [Member] | Equity Securities [Member] | U.S. [Member] | Industrial [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Fair value of plan assets	819
Defined Benefit Pension Plan [Member] | U.S. Defined Benefit Pension Plans [Member] | Equity Securities [Member] | U.S. [Member] | Information Technology [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Fair value of plan assets	2,061		188
Defined Benefit Pension Plan [Member] | U.S. Defined Benefit Pension Plans [Member] | Equity Securities [Member] | U.S. [Member] | Mutual Funds [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Fair value of plan assets	91,258		72,571
Defined Benefit Pension Plan [Member] | U.S. Defined Benefit Pension Plans [Member] | Equity Securities [Member] | U.S. [Member] | Materials [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Fair value of plan assets	248
Defined Benefit Pension Plan [Member] | U.S. Defined Benefit Pension Plans [Member] | Equity Securities [Member] | U.S. [Member] | Telecommunications [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Fair value of plan assets	198
Defined Benefit Pension Plan [Member] | U.S. Defined Benefit Pension Plans [Member] | Equity Securities [Member] | U.S. [Member] | Utilities [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Fair value of plan assets	204
Defined Benefit Pension Plan [Member] | U.S. Defined Benefit Pension Plans [Member] | Equity Securities [Member] | U.S. [Member] | Bank & Financial Services [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Fair value of plan assets			631
Defined Benefit Pension Plan [Member] | U.S. Defined Benefit Pension Plans [Member] | Equity Securities [Member] | U.S. [Member] | Capital Goods [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Fair value of plan assets			75
Defined Benefit Pension Plan [Member] | U.S. Defined Benefit Pension Plans [Member] | Equity Securities [Member] | U.S. [Member] | Chemicals [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Fair value of plan assets			20
Defined Benefit Pension Plan [Member] | U.S. Defined Benefit Pension Plans [Member] | Equity Securities [Member] | U.S. [Member] | Commercial Services [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Fair value of plan assets			16
Defined Benefit Pension Plan [Member] | U.S. Defined Benefit Pension Plans [Member] | Equity Securities [Member] | U.S. [Member] | Electronics [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Fair value of plan assets			67
Defined Benefit Pension Plan [Member] | U.S. Defined Benefit Pension Plans [Member] | Equity Securities [Member] | U.S. [Member] | Oil & Gas [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Fair value of plan assets			87
Defined Benefit Pension Plan [Member] | U.S. Defined Benefit Pension Plans [Member] | Equity Securities [Member] | U.S. [Member] | Retail [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Fair value of plan assets			101
Defined Benefit Pension Plan [Member] | U.S. Defined Benefit Pension Plans [Member] | Equity Securities [Member] | U.S. [Member] | U.S., Other [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Fair value of plan assets			211
Defined Benefit Pension Plan [Member] | U.S. Defined Benefit Pension Plans [Member] | Equity Securities [Member] | International [Member] | Information Technology [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Fair value of plan assets			6
Defined Benefit Pension Plan [Member] | U.S. Defined Benefit Pension Plans [Member] | Equity Securities [Member] | International [Member] | Chemicals [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Fair value of plan assets			7
Defined Benefit Pension Plan [Member] | U.S. Defined Benefit Pension Plans [Member] | Alternative Investments [Member] | Managed Funds [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Fair value of plan assets	49,838		33,830
Defined Benefit Pension Plan [Member] | U.S. Defined Benefit Pension Plans [Member] | Other (Primarily Cash and Cash Equivalents) [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Fair value of plan assets	12,411		44,076
Defined Benefit Pension Plan [Member] | U.S. Defined Benefit Pension Plans [Member] | Other (Primarily Cash and Cash Equivalents) [Member] | Cash and Cash Equivalents [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Fair value of plan assets	11,012		27,902
Defined Benefit Pension Plan [Member] | U.S. Defined Benefit Pension Plans [Member] | Other (Primarily Cash and Cash Equivalents) [Member] | Other [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Fair value of plan assets	1,225		16,020
Defined Benefit Pension Plan [Member] | U.S. Defined Benefit Pension Plans [Member] | Other (Primarily Cash and Cash Equivalents) [Member] | Commingled Funds [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Fair value of plan assets	174		154
Defined Benefit Pension Plan [Member] | Foreign Pension Benefits [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Fair value of plan assets	56,419		48,055		49,628
Defined Benefit Pension Plan [Member] | Foreign Pension Benefits [Member] | Equity Securities [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Fair value of plan assets	27,632		22,862
Defined Benefit Pension Plan [Member] | Foreign Pension Benefits [Member] | Equity Securities [Member] | International [Member] | Commingled Funds [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Fair value of plan assets	23,015		19,146
Defined Benefit Pension Plan [Member] | Foreign Pension Benefits [Member] | Equity Securities [Member] | U.K. [Member] | Commingled Funds [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Fair value of plan assets	4,617		3,716
Defined Benefit Pension Plan [Member] | Foreign Pension Benefits [Member] | Fixed Income Securities [Member] | U.K. [Member] | Commingled Funds [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Fair value of plan assets	18,851		16,426
Defined Benefit Pension Plan [Member] | Foreign Pension Benefits [Member] | Alternative Investments [Member] | Hedge and Absolute Return Funds [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Fair value of plan assets	9,637		8,593
Defined Benefit Pension Plan [Member] | Foreign Pension Benefits [Member] | Other (Primarily Cash and Cash Equivalents) [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Fair value of plan assets	299		174
Quoted Prices in Active Markets for Identical Inputs (Level 1) [Member] | Transportation [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Fair value of plan assets			18
Quoted Prices in Active Markets for Identical Inputs (Level 1) [Member] | Wholesale Distribution [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Fair value of plan assets			16
Quoted Prices in Active Markets for Identical Inputs (Level 1) [Member] | Fixed Income Securities [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Fair value of plan assets	25,860		36,601
Quoted Prices in Active Markets for Identical Inputs (Level 1) [Member] | Fixed Income Securities [Member] | Mutual Funds [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Fair value of plan assets	18,884		36,601
Quoted Prices in Active Markets for Identical Inputs (Level 1) [Member] | Fixed Income Securities [Member] | Corporate Bonds [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Fair value of plan assets	0
Quoted Prices in Active Markets for Identical Inputs (Level 1) [Member] | Fixed Income Securities [Member] | Treasury Bonds [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Fair value of plan assets	6,976
Quoted Prices in Active Markets for Identical Inputs (Level 1) [Member] | Fixed Income Securities [Member] | Agency Bonds [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Fair value of plan assets	0
Quoted Prices in Active Markets for Identical Inputs (Level 1) [Member] | Defined Benefit Pension Plan [Member] | U.S. Defined Benefit Pension Plans [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Fair value of plan assets	136,176		154,738
Quoted Prices in Active Markets for Identical Inputs (Level 1) [Member] | Defined Benefit Pension Plan [Member] | U.S. Defined Benefit Pension Plans [Member] | Equity Securities [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Fair value of plan assets	99,302		74,215
Quoted Prices in Active Markets for Identical Inputs (Level 1) [Member] | Defined Benefit Pension Plan [Member] | U.S. Defined Benefit Pension Plans [Member] | Equity Securities [Member] | U.S. [Member] | Consumer Discretionary [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Fair value of plan assets	637
Quoted Prices in Active Markets for Identical Inputs (Level 1) [Member] | Defined Benefit Pension Plan [Member] | U.S. Defined Benefit Pension Plans [Member] | Equity Securities [Member] | U.S. [Member] | Consumer Staples [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Fair value of plan assets	896
Quoted Prices in Active Markets for Identical Inputs (Level 1) [Member] | Defined Benefit Pension Plan [Member] | U.S. Defined Benefit Pension Plans [Member] | Equity Securities [Member] | U.S. [Member] | Energy [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Fair value of plan assets	427
Quoted Prices in Active Markets for Identical Inputs (Level 1) [Member] | Defined Benefit Pension Plan [Member] | U.S. Defined Benefit Pension Plans [Member] | Equity Securities [Member] | U.S. [Member] | Financial [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Fair value of plan assets	1,362
Quoted Prices in Active Markets for Identical Inputs (Level 1) [Member] | Defined Benefit Pension Plan [Member] | U.S. Defined Benefit Pension Plans [Member] | Equity Securities [Member] | U.S. [Member] | Health Care [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Fair value of plan assets	1,192		201
Quoted Prices in Active Markets for Identical Inputs (Level 1) [Member] | Defined Benefit Pension Plan [Member] | U.S. Defined Benefit Pension Plans [Member] | Equity Securities [Member] | U.S. [Member] | Industrial [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Fair value of plan assets	819
Quoted Prices in Active Markets for Identical Inputs (Level 1) [Member] | Defined Benefit Pension Plan [Member] | U.S. Defined Benefit Pension Plans [Member] | Equity Securities [Member] | U.S. [Member] | Information Technology [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Fair value of plan assets	2,061		188
Quoted Prices in Active Markets for Identical Inputs (Level 1) [Member] | Defined Benefit Pension Plan [Member] | U.S. Defined Benefit Pension Plans [Member] | Equity Securities [Member] | U.S. [Member] | Mutual Funds [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Fair value of plan assets	91,258		72,571
Quoted Prices in Active Markets for Identical Inputs (Level 1) [Member] | Defined Benefit Pension Plan [Member] | U.S. Defined Benefit Pension Plans [Member] | Equity Securities [Member] | U.S. [Member] | Materials [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Fair value of plan assets	248
Quoted Prices in Active Markets for Identical Inputs (Level 1) [Member] | Defined Benefit Pension Plan [Member] | U.S. Defined Benefit Pension Plans [Member] | Equity Securities [Member] | U.S. [Member] | Telecommunications [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Fair value of plan assets	198
Quoted Prices in Active Markets for Identical Inputs (Level 1) [Member] | Defined Benefit Pension Plan [Member] | U.S. Defined Benefit Pension Plans [Member] | Equity Securities [Member] | U.S. [Member] | Utilities [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Fair value of plan assets	204
Quoted Prices in Active Markets for Identical Inputs (Level 1) [Member] | Defined Benefit Pension Plan [Member] | U.S. Defined Benefit Pension Plans [Member] | Equity Securities [Member] | U.S. [Member] | Bank & Financial Services [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Fair value of plan assets			631
Quoted Prices in Active Markets for Identical Inputs (Level 1) [Member] | Defined Benefit Pension Plan [Member] | U.S. Defined Benefit Pension Plans [Member] | Equity Securities [Member] | U.S. [Member] | Capital Goods [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Fair value of plan assets			75
Quoted Prices in Active Markets for Identical Inputs (Level 1) [Member] | Defined Benefit Pension Plan [Member] | U.S. Defined Benefit Pension Plans [Member] | Equity Securities [Member] | U.S. [Member] | Chemicals [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Fair value of plan assets			20
Quoted Prices in Active Markets for Identical Inputs (Level 1) [Member] | Defined Benefit Pension Plan [Member] | U.S. Defined Benefit Pension Plans [Member] | Equity Securities [Member] | U.S. [Member] | Commercial Services [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Fair value of plan assets			16
Quoted Prices in Active Markets for Identical Inputs (Level 1) [Member] | Defined Benefit Pension Plan [Member] | U.S. Defined Benefit Pension Plans [Member] | Equity Securities [Member] | U.S. [Member] | Electronics [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Fair value of plan assets			67
Quoted Prices in Active Markets for Identical Inputs (Level 1) [Member] | Defined Benefit Pension Plan [Member] | U.S. Defined Benefit Pension Plans [Member] | Equity Securities [Member] | U.S. [Member] | Oil & Gas [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Fair value of plan assets			87
Quoted Prices in Active Markets for Identical Inputs (Level 1) [Member] | Defined Benefit Pension Plan [Member] | U.S. Defined Benefit Pension Plans [Member] | Equity Securities [Member] | U.S. [Member] | Retail [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Fair value of plan assets			101
Quoted Prices in Active Markets for Identical Inputs (Level 1) [Member] | Defined Benefit Pension Plan [Member] | U.S. Defined Benefit Pension Plans [Member] | Equity Securities [Member] | U.S. [Member] | U.S., Other [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Fair value of plan assets			211
Quoted Prices in Active Markets for Identical Inputs (Level 1) [Member] | Defined Benefit Pension Plan [Member] | U.S. Defined Benefit Pension Plans [Member] | Equity Securities [Member] | International [Member] | Information Technology [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Fair value of plan assets			6
Quoted Prices in Active Markets for Identical Inputs (Level 1) [Member] | Defined Benefit Pension Plan [Member] | U.S. Defined Benefit Pension Plans [Member] | Equity Securities [Member] | International [Member] | Chemicals [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Fair value of plan assets			7
Quoted Prices in Active Markets for Identical Inputs (Level 1) [Member] | Defined Benefit Pension Plan [Member] | U.S. Defined Benefit Pension Plans [Member] | Alternative Investments [Member] | Managed Funds [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Fair value of plan assets	0		0
Quoted Prices in Active Markets for Identical Inputs (Level 1) [Member] | Defined Benefit Pension Plan [Member] | U.S. Defined Benefit Pension Plans [Member] | Other (Primarily Cash and Cash Equivalents) [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Fair value of plan assets	11,014		43,922
Quoted Prices in Active Markets for Identical Inputs (Level 1) [Member] | Defined Benefit Pension Plan [Member] | U.S. Defined Benefit Pension Plans [Member] | Other (Primarily Cash and Cash Equivalents) [Member] | Cash and Cash Equivalents [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Fair value of plan assets	11,012		27,902
Quoted Prices in Active Markets for Identical Inputs (Level 1) [Member] | Defined Benefit Pension Plan [Member] | U.S. Defined Benefit Pension Plans [Member] | Other (Primarily Cash and Cash Equivalents) [Member] | Other [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Fair value of plan assets	2		16,020
Quoted Prices in Active Markets for Identical Inputs (Level 1) [Member] | Defined Benefit Pension Plan [Member] | U.S. Defined Benefit Pension Plans [Member] | Other (Primarily Cash and Cash Equivalents) [Member] | Commingled Funds [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Fair value of plan assets	0		0
Quoted Prices in Active Markets for Identical Inputs (Level 1) [Member] | Defined Benefit Pension Plan [Member] | Foreign Pension Benefits [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Fair value of plan assets	299		174
Quoted Prices in Active Markets for Identical Inputs (Level 1) [Member] | Defined Benefit Pension Plan [Member] | Foreign Pension Benefits [Member] | Equity Securities [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Fair value of plan assets	0		0
Quoted Prices in Active Markets for Identical Inputs (Level 1) [Member] | Defined Benefit Pension Plan [Member] | Foreign Pension Benefits [Member] | Equity Securities [Member] | International [Member] | Commingled Funds [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Fair value of plan assets	0		0
Quoted Prices in Active Markets for Identical Inputs (Level 1) [Member] | Defined Benefit Pension Plan [Member] | Foreign Pension Benefits [Member] | Equity Securities [Member] | U.K. [Member] | Commingled Funds [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Fair value of plan assets	0		0
Quoted Prices in Active Markets for Identical Inputs (Level 1) [Member] | Defined Benefit Pension Plan [Member] | Foreign Pension Benefits [Member] | Fixed Income Securities [Member] | U.K. [Member] | Commingled Funds [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Fair value of plan assets	0		0
Quoted Prices in Active Markets for Identical Inputs (Level 1) [Member] | Defined Benefit Pension Plan [Member] | Foreign Pension Benefits [Member] | Alternative Investments [Member] | Hedge and Absolute Return Funds [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Fair value of plan assets	0		0
Quoted Prices in Active Markets for Identical Inputs (Level 1) [Member] | Defined Benefit Pension Plan [Member] | Foreign Pension Benefits [Member] | Other (Primarily Cash and Cash Equivalents) [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Fair value of plan assets	299		174
Significant Other Observable Inputs (Level 2) [Member] | Transportation [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Fair value of plan assets			0
Significant Other Observable Inputs (Level 2) [Member] | Wholesale Distribution [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Fair value of plan assets			0
Significant Other Observable Inputs (Level 2) [Member] | Fixed Income Securities [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Fair value of plan assets	11,727		0
Significant Other Observable Inputs (Level 2) [Member] | Fixed Income Securities [Member] | Mutual Funds [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Fair value of plan assets	0		0
Significant Other Observable Inputs (Level 2) [Member] | Fixed Income Securities [Member] | Corporate Bonds [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Fair value of plan assets	10,801
Significant Other Observable Inputs (Level 2) [Member] | Fixed Income Securities [Member] | Treasury Bonds [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Fair value of plan assets	0
Significant Other Observable Inputs (Level 2) [Member] | Fixed Income Securities [Member] | Agency Bonds [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Fair value of plan assets	926
Significant Other Observable Inputs (Level 2) [Member] | Defined Benefit Pension Plan [Member] | U.S. Defined Benefit Pension Plans [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Fair value of plan assets	11,901		154
Significant Other Observable Inputs (Level 2) [Member] | Defined Benefit Pension Plan [Member] | U.S. Defined Benefit Pension Plans [Member] | Equity Securities [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Fair value of plan assets	0		0
Significant Other Observable Inputs (Level 2) [Member] | Defined Benefit Pension Plan [Member] | U.S. Defined Benefit Pension Plans [Member] | Equity Securities [Member] | U.S. [Member] | Consumer Discretionary [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Fair value of plan assets	0
Significant Other Observable Inputs (Level 2) [Member] | Defined Benefit Pension Plan [Member] | U.S. Defined Benefit Pension Plans [Member] | Equity Securities [Member] | U.S. [Member] | Consumer Staples [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Fair value of plan assets	0
Significant Other Observable Inputs (Level 2) [Member] | Defined Benefit Pension Plan [Member] | U.S. Defined Benefit Pension Plans [Member] | Equity Securities [Member] | U.S. [Member] | Energy [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Fair value of plan assets	0
Significant Other Observable Inputs (Level 2) [Member] | Defined Benefit Pension Plan [Member] | U.S. Defined Benefit Pension Plans [Member] | Equity Securities [Member] | U.S. [Member] | Financial [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Fair value of plan assets	0
Significant Other Observable Inputs (Level 2) [Member] | Defined Benefit Pension Plan [Member] | U.S. Defined Benefit Pension Plans [Member] | Equity Securities [Member] | U.S. [Member] | Health Care [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Fair value of plan assets	0		0
Significant Other Observable Inputs (Level 2) [Member] | Defined Benefit Pension Plan [Member] | U.S. Defined Benefit Pension Plans [Member] | Equity Securities [Member] | U.S. [Member] | Industrial [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Fair value of plan assets	0
Significant Other Observable Inputs (Level 2) [Member] | Defined Benefit Pension Plan [Member] | U.S. Defined Benefit Pension Plans [Member] | Equity Securities [Member] | U.S. [Member] | Information Technology [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Fair value of plan assets	0		0
Significant Other Observable Inputs (Level 2) [Member] | Defined Benefit Pension Plan [Member] | U.S. Defined Benefit Pension Plans [Member] | Equity Securities [Member] | U.S. [Member] | Mutual Funds [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Fair value of plan assets	0		0
Significant Other Observable Inputs (Level 2) [Member] | Defined Benefit Pension Plan [Member] | U.S. Defined Benefit Pension Plans [Member] | Equity Securities [Member] | U.S. [Member] | Materials [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Fair value of plan assets	0
Significant Other Observable Inputs (Level 2) [Member] | Defined Benefit Pension Plan [Member] | U.S. Defined Benefit Pension Plans [Member] | Equity Securities [Member] | U.S. [Member] | Telecommunications [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Fair value of plan assets	0
Significant Other Observable Inputs (Level 2) [Member] | Defined Benefit Pension Plan [Member] | U.S. Defined Benefit Pension Plans [Member] | Equity Securities [Member] | U.S. [Member] | Utilities [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Fair value of plan assets	0
Significant Other Observable Inputs (Level 2) [Member] | Defined Benefit Pension Plan [Member] | U.S. Defined Benefit Pension Plans [Member] | Equity Securities [Member] | U.S. [Member] | Bank & Financial Services [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Fair value of plan assets			0
Significant Other Observable Inputs (Level 2) [Member] | Defined Benefit Pension Plan [Member] | U.S. Defined Benefit Pension Plans [Member] | Equity Securities [Member] | U.S. [Member] | Capital Goods [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Fair value of plan assets			0
Significant Other Observable Inputs (Level 2) [Member] | Defined Benefit Pension Plan [Member] | U.S. Defined Benefit Pension Plans [Member] | Equity Securities [Member] | U.S. [Member] | Chemicals [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Fair value of plan assets			0
Significant Other Observable Inputs (Level 2) [Member] | Defined Benefit Pension Plan [Member] | U.S. Defined Benefit Pension Plans [Member] | Equity Securities [Member] | U.S. [Member] | Commercial Services [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Fair value of plan assets			0
Significant Other Observable Inputs (Level 2) [Member] | Defined Benefit Pension Plan [Member] | U.S. Defined Benefit Pension Plans [Member] | Equity Securities [Member] | U.S. [Member] | Electronics [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Fair value of plan assets			0
Significant Other Observable Inputs (Level 2) [Member] | Defined Benefit Pension Plan [Member] | U.S. Defined Benefit Pension Plans [Member] | Equity Securities [Member] | U.S. [Member] | Oil & Gas [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Fair value of plan assets			0
Significant Other Observable Inputs (Level 2) [Member] | Defined Benefit Pension Plan [Member] | U.S. Defined Benefit Pension Plans [Member] | Equity Securities [Member] | U.S. [Member] | Retail [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Fair value of plan assets			0
Significant Other Observable Inputs (Level 2) [Member] | Defined Benefit Pension Plan [Member] | U.S. Defined Benefit Pension Plans [Member] | Equity Securities [Member] | U.S. [Member] | U.S., Other [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Fair value of plan assets			0
Significant Other Observable Inputs (Level 2) [Member] | Defined Benefit Pension Plan [Member] | U.S. Defined Benefit Pension Plans [Member] | Equity Securities [Member] | International [Member] | Information Technology [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Fair value of plan assets			0
Significant Other Observable Inputs (Level 2) [Member] | Defined Benefit Pension Plan [Member] | U.S. Defined Benefit Pension Plans [Member] | Equity Securities [Member] | International [Member] | Chemicals [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Fair value of plan assets			0
Significant Other Observable Inputs (Level 2) [Member] | Defined Benefit Pension Plan [Member] | U.S. Defined Benefit Pension Plans [Member] | Alternative Investments [Member] | Managed Funds [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Fair value of plan assets	0		0
Significant Other Observable Inputs (Level 2) [Member] | Defined Benefit Pension Plan [Member] | U.S. Defined Benefit Pension Plans [Member] | Other (Primarily Cash and Cash Equivalents) [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Fair value of plan assets	174		154
Significant Other Observable Inputs (Level 2) [Member] | Defined Benefit Pension Plan [Member] | U.S. Defined Benefit Pension Plans [Member] | Other (Primarily Cash and Cash Equivalents) [Member] | Cash and Cash Equivalents [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Fair value of plan assets	0		0
Significant Other Observable Inputs (Level 2) [Member] | Defined Benefit Pension Plan [Member] | U.S. Defined Benefit Pension Plans [Member] | Other (Primarily Cash and Cash Equivalents) [Member] | Other [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Fair value of plan assets	0		0
Significant Other Observable Inputs (Level 2) [Member] | Defined Benefit Pension Plan [Member] | U.S. Defined Benefit Pension Plans [Member] | Other (Primarily Cash and Cash Equivalents) [Member] | Commingled Funds [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Fair value of plan assets	174		154
Significant Other Observable Inputs (Level 2) [Member] | Defined Benefit Pension Plan [Member] | Foreign Pension Benefits [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Fair value of plan assets	46,483		39,288
Significant Other Observable Inputs (Level 2) [Member] | Defined Benefit Pension Plan [Member] | Foreign Pension Benefits [Member] | Equity Securities [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Fair value of plan assets	27,632		22,862
Significant Other Observable Inputs (Level 2) [Member] | Defined Benefit Pension Plan [Member] | Foreign Pension Benefits [Member] | Equity Securities [Member] | International [Member] | Commingled Funds [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Fair value of plan assets	23,015		19,146
Significant Other Observable Inputs (Level 2) [Member] | Defined Benefit Pension Plan [Member] | Foreign Pension Benefits [Member] | Equity Securities [Member] | U.K. [Member] | Commingled Funds [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Fair value of plan assets	4,617		3,716
Significant Other Observable Inputs (Level 2) [Member] | Defined Benefit Pension Plan [Member] | Foreign Pension Benefits [Member] | Fixed Income Securities [Member] | U.K. [Member] | Commingled Funds [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Fair value of plan assets	18,851		16,426
Significant Other Observable Inputs (Level 2) [Member] | Defined Benefit Pension Plan [Member] | Foreign Pension Benefits [Member] | Alternative Investments [Member] | Hedge and Absolute Return Funds [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Fair value of plan assets	0		0
Significant Other Observable Inputs (Level 2) [Member] | Defined Benefit Pension Plan [Member] | Foreign Pension Benefits [Member] | Other (Primarily Cash and Cash Equivalents) [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Fair value of plan assets	0		0
Significant Unobservable Inputs (Level 3) [Member] | Transportation [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Fair value of plan assets			0
Significant Unobservable Inputs (Level 3) [Member] | Wholesale Distribution [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Fair value of plan assets			0
Significant Unobservable Inputs (Level 3) [Member] | Fixed Income Securities [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Fair value of plan assets	0		0
Significant Unobservable Inputs (Level 3) [Member] | Fixed Income Securities [Member] | Mutual Funds [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Fair value of plan assets	0		0
Significant Unobservable Inputs (Level 3) [Member] | Fixed Income Securities [Member] | Corporate Bonds [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Fair value of plan assets	0
Significant Unobservable Inputs (Level 3) [Member] | Fixed Income Securities [Member] | Treasury Bonds [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Fair value of plan assets	0
Significant Unobservable Inputs (Level 3) [Member] | Fixed Income Securities [Member] | Agency Bonds [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Fair value of plan assets	0
Significant Unobservable Inputs (Level 3) [Member] | Defined Benefit Pension Plan [Member] | U.S. Defined Benefit Pension Plans [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Fair value of plan assets	51,061		33,830
Significant Unobservable Inputs (Level 3) [Member] | Defined Benefit Pension Plan [Member] | U.S. Defined Benefit Pension Plans [Member] | U.S. [Member] | Hedge and Absolute Return Funds [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Fair value of plan assets			0		4,967
Significant Unobservable Inputs (Level 3) [Member] | Defined Benefit Pension Plan [Member] | U.S. Defined Benefit Pension Plans [Member] | U.S. [Member] | Managed Funds [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Fair value of plan assets	49,838		33,830		32,210
Significant Unobservable Inputs (Level 3) [Member] | Defined Benefit Pension Plan [Member] | U.S. Defined Benefit Pension Plans [Member] | Equity Securities [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Fair value of plan assets	0		0
Significant Unobservable Inputs (Level 3) [Member] | Defined Benefit Pension Plan [Member] | U.S. Defined Benefit Pension Plans [Member] | Equity Securities [Member] | U.S. [Member] | Consumer Discretionary [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Fair value of plan assets	0
Significant Unobservable Inputs (Level 3) [Member] | Defined Benefit Pension Plan [Member] | U.S. Defined Benefit Pension Plans [Member] | Equity Securities [Member] | U.S. [Member] | Consumer Staples [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Fair value of plan assets	0
Significant Unobservable Inputs (Level 3) [Member] | Defined Benefit Pension Plan [Member] | U.S. Defined Benefit Pension Plans [Member] | Equity Securities [Member] | U.S. [Member] | Energy [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Fair value of plan assets	0
Significant Unobservable Inputs (Level 3) [Member] | Defined Benefit Pension Plan [Member] | U.S. Defined Benefit Pension Plans [Member] | Equity Securities [Member] | U.S. [Member] | Financial [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Fair value of plan assets	0
Significant Unobservable Inputs (Level 3) [Member] | Defined Benefit Pension Plan [Member] | U.S. Defined Benefit Pension Plans [Member] | Equity Securities [Member] | U.S. [Member] | Health Care [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Fair value of plan assets	0		0
Significant Unobservable Inputs (Level 3) [Member] | Defined Benefit Pension Plan [Member] | U.S. Defined Benefit Pension Plans [Member] | Equity Securities [Member] | U.S. [Member] | Industrial [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Fair value of plan assets	0
Significant Unobservable Inputs (Level 3) [Member] | Defined Benefit Pension Plan [Member] | U.S. Defined Benefit Pension Plans [Member] | Equity Securities [Member] | U.S. [Member] | Information Technology [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Fair value of plan assets	0		0
Significant Unobservable Inputs (Level 3) [Member] | Defined Benefit Pension Plan [Member] | U.S. Defined Benefit Pension Plans [Member] | Equity Securities [Member] | U.S. [Member] | Mutual Funds [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Fair value of plan assets	0		0
Significant Unobservable Inputs (Level 3) [Member] | Defined Benefit Pension Plan [Member] | U.S. Defined Benefit Pension Plans [Member] | Equity Securities [Member] | U.S. [Member] | Materials [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Fair value of plan assets	0
Significant Unobservable Inputs (Level 3) [Member] | Defined Benefit Pension Plan [Member] | U.S. Defined Benefit Pension Plans [Member] | Equity Securities [Member] | U.S. [Member] | Telecommunications [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Fair value of plan assets	0
Significant Unobservable Inputs (Level 3) [Member] | Defined Benefit Pension Plan [Member] | U.S. Defined Benefit Pension Plans [Member] | Equity Securities [Member] | U.S. [Member] | Utilities [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Fair value of plan assets	0
Significant Unobservable Inputs (Level 3) [Member] | Defined Benefit Pension Plan [Member] | U.S. Defined Benefit Pension Plans [Member] | Equity Securities [Member] | U.S. [Member] | Bank & Financial Services [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Fair value of plan assets			0
Significant Unobservable Inputs (Level 3) [Member] | Defined Benefit Pension Plan [Member] | U.S. Defined Benefit Pension Plans [Member] | Equity Securities [Member] | U.S. [Member] | Capital Goods [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Fair value of plan assets			0
Significant Unobservable Inputs (Level 3) [Member] | Defined Benefit Pension Plan [Member] | U.S. Defined Benefit Pension Plans [Member] | Equity Securities [Member] | U.S. [Member] | Chemicals [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Fair value of plan assets			0
Significant Unobservable Inputs (Level 3) [Member] | Defined Benefit Pension Plan [Member] | U.S. Defined Benefit Pension Plans [Member] | Equity Securities [Member] | U.S. [Member] | Commercial Services [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Fair value of plan assets			0
Significant Unobservable Inputs (Level 3) [Member] | Defined Benefit Pension Plan [Member] | U.S. Defined Benefit Pension Plans [Member] | Equity Securities [Member] | U.S. [Member] | Electronics [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Fair value of plan assets			0
Significant Unobservable Inputs (Level 3) [Member] | Defined Benefit Pension Plan [Member] | U.S. Defined Benefit Pension Plans [Member] | Equity Securities [Member] | U.S. [Member] | Oil & Gas [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Fair value of plan assets			0
Significant Unobservable Inputs (Level 3) [Member] | Defined Benefit Pension Plan [Member] | U.S. Defined Benefit Pension Plans [Member] | Equity Securities [Member] | U.S. [Member] | Retail [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Fair value of plan assets			0
Significant Unobservable Inputs (Level 3) [Member] | Defined Benefit Pension Plan [Member] | U.S. Defined Benefit Pension Plans [Member] | Equity Securities [Member] | U.S. [Member] | U.S., Other [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Fair value of plan assets			0
Significant Unobservable Inputs (Level 3) [Member] | Defined Benefit Pension Plan [Member] | U.S. Defined Benefit Pension Plans [Member] | Equity Securities [Member] | International [Member] | Information Technology [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Fair value of plan assets			0
Significant Unobservable Inputs (Level 3) [Member] | Defined Benefit Pension Plan [Member] | U.S. Defined Benefit Pension Plans [Member] | Equity Securities [Member] | International [Member] | Chemicals [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Fair value of plan assets			0
Significant Unobservable Inputs (Level 3) [Member] | Defined Benefit Pension Plan [Member] | U.S. Defined Benefit Pension Plans [Member] | Alternative Investments [Member] | Managed Funds [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Fair value of plan assets	49,838		33,830
Significant Unobservable Inputs (Level 3) [Member] | Defined Benefit Pension Plan [Member] | U.S. Defined Benefit Pension Plans [Member] | Other (Primarily Cash and Cash Equivalents) [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Fair value of plan assets	1,223		0
Significant Unobservable Inputs (Level 3) [Member] | Defined Benefit Pension Plan [Member] | U.S. Defined Benefit Pension Plans [Member] | Other (Primarily Cash and Cash Equivalents) [Member] | Cash and Cash Equivalents [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Fair value of plan assets	0		0
Significant Unobservable Inputs (Level 3) [Member] | Defined Benefit Pension Plan [Member] | U.S. Defined Benefit Pension Plans [Member] | Other (Primarily Cash and Cash Equivalents) [Member] | Other [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Fair value of plan assets	1,223		0
Significant Unobservable Inputs (Level 3) [Member] | Defined Benefit Pension Plan [Member] | U.S. Defined Benefit Pension Plans [Member] | Other (Primarily Cash and Cash Equivalents) [Member] | Commingled Funds [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Fair value of plan assets	0		0
Significant Unobservable Inputs (Level 3) [Member] | Defined Benefit Pension Plan [Member] | Foreign Pension Benefits [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Fair value of plan assets	9,637		8,593		$ 10,571
Significant Unobservable Inputs (Level 3) [Member] | Defined Benefit Pension Plan [Member] | Foreign Pension Benefits [Member] | Equity Securities [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Fair value of plan assets	0		0
Significant Unobservable Inputs (Level 3) [Member] | Defined Benefit Pension Plan [Member] | Foreign Pension Benefits [Member] | Equity Securities [Member] | International [Member] | Commingled Funds [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Fair value of plan assets	0		0
Significant Unobservable Inputs (Level 3) [Member] | Defined Benefit Pension Plan [Member] | Foreign Pension Benefits [Member] | Equity Securities [Member] | U.K. [Member] | Commingled Funds [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Fair value of plan assets	0		0
Significant Unobservable Inputs (Level 3) [Member] | Defined Benefit Pension Plan [Member] | Foreign Pension Benefits [Member] | Fixed Income Securities [Member] | U.K. [Member] | Commingled Funds [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Fair value of plan assets	0		0
Significant Unobservable Inputs (Level 3) [Member] | Defined Benefit Pension Plan [Member] | Foreign Pension Benefits [Member] | Alternative Investments [Member] | Hedge and Absolute Return Funds [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Fair value of plan assets	9,637		8,593
Significant Unobservable Inputs (Level 3) [Member] | Defined Benefit Pension Plan [Member] | Foreign Pension Benefits [Member] | Other (Primarily Cash and Cash Equivalents) [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Fair value of plan assets	$ 0		$ 0

Pension and Other Postretirem75

Pension and Other Postretirement Benefits - Asset Categories Based on the Nature and Risks of the Plan Assets (Parenthetical) (Detail) - Defined Benefit Pension Plan [Member] - U.S. Defined Benefit Pension Plans [Member] - Managed Funds [Member]	Dec. 31, 2017	Dec. 31, 2016
Equity Securities [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Target Allocation	47.30%	45.90%
Alternative Investments [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Target Allocation	41.10%	44.50%
Fixed Income Securities [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Target Allocation	9.60%	7.40%
Other, Primarily Cash And Cash Equivalents [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Target Allocation	2.00%	2.20%

Pension and Other Postretirem76

Pension and Other Postretirement Benefits - Summary of Changes in the Fair Value of the Level 3 Plan Assets for U.S. and Foreign Pension Plans (Detail) £ in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2017USD ($)	Dec. 31, 2017GBP (£)	Dec. 31, 2016USD ($)	Dec. 31, 2015USD ($)
Foreign Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets, Beginning balance	$ 48,055	£ 38,955
Voluntary contributions made	1,521		$ 1,522	$ 1,715
Fair value of plan assets, Ending balance	56,419	£ 41,820	48,055
Defined Benefit Pension Plan [Member] | U.S. Defined Benefit Pension Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets, Beginning balance	188,722
Fair value of plan assets, Ending balance	199,138		188,722
Defined Benefit Pension Plan [Member] | U.S. Defined Benefit Pension Plans [Member] | U.S. [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets, Beginning balance	188,722		139,376
Voluntary contributions made	403		376
Change in net unrealized (losses) gains	13,825		(160)
Other, primarily impact from changes in foreign currency exchange rates	0		0
Fair value of plan assets, Ending balance	199,138		188,722	139,376
Defined Benefit Pension Plan [Member] | Foreign Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets, Beginning balance	48,055		49,628
Voluntary contributions made	1,979		1,687
Change in net unrealized (losses) gains	(7,954)		8,869
Other, primarily impact from changes in foreign currency exchange rates	4,673		(8,930)
Fair value of plan assets, Ending balance	56,419		48,055	49,628
Significant Unobservable Inputs (Level 3) [Member] | Defined Benefit Pension Plan [Member] | U.S. Defined Benefit Pension Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets, Beginning balance	33,830
Fair value of plan assets, Ending balance	51,061		33,830
Significant Unobservable Inputs (Level 3) [Member] | Defined Benefit Pension Plan [Member] | U.S. Defined Benefit Pension Plans [Member] | U.S. [Member] | Hedge and Absolute Return Funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets, Beginning balance	0		4,967
Withdrawals			(4,967)
Realized gains (losses)			0
Change in net unrealized (losses) gains			0
Other, primarily impact from changes in foreign currency exchange rates			0
Fair value of plan assets, Ending balance			0	4,967
Significant Unobservable Inputs (Level 3) [Member] | Defined Benefit Pension Plan [Member] | U.S. Defined Benefit Pension Plans [Member] | U.S. [Member] | Managed Funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets, Beginning balance	33,830		32,210
Voluntary contributions made	16,000
Withdrawals	(5,364)		0
Realized gains (losses)	1,304		1,857
Change in net unrealized (losses) gains	4,068		(237)
Other, primarily impact from changes in foreign currency exchange rates	0		0
Fair value of plan assets, Ending balance	49,838		33,830	32,210
Significant Unobservable Inputs (Level 3) [Member] | Defined Benefit Pension Plan [Member] | Foreign Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets, Beginning balance	8,593		10,571
Voluntary contributions made	0
Withdrawals	0		0
Realized gains (losses)	0		0
Change in net unrealized (losses) gains	229		(280)
Other, primarily impact from changes in foreign currency exchange rates	815		(1,698)
Fair value of plan assets, Ending balance	$ 9,637		$ 8,593	$ 10,571

Pension and Other Postretirem77

Pension and Other Postretirement Benefits - Net Periodic Pension and Other Postretirement Costs (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Defined Benefit Pension Plan [Member] | U.S. Defined Benefit Pension Plans [Member] | U.S. [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 1,651	$ 1,714	$ 2,743
Interest cost	8,413	9,977	7,990
Expected return on plan assets	(12,503)	(13,424)	(10,996)
Amortization of prior service cost (credit)	52	44	371
Actuarial loss (gain)	4,111	3,324	5,440
Curtailment (gain) loss	0	(887)	1,303
Net cost	1,724	748	6,851
Defined Benefit Pension Plan [Member] | Foreign Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	150	314	0
Interest cost	1,845	2,250	2,394
Expected return on plan assets	(2,239)	(2,461)	(2,681)
Amortization of prior service cost (credit)	0	0	0
Actuarial loss (gain)	751	670	845
Curtailment (gain) loss	0	0	0
Net cost	507	773	558
Other Postretirement Benefit Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	492	504	384
Interest cost	571	722	474
Expected return on plan assets	0	0	0
Amortization of prior service cost (credit)	(1,607)	(1,277)	(672)
Actuarial loss (gain)	(24)	36	26
Curtailment (gain) loss	0	0	0
Net cost	$ (568)	$ (15)	$ 212

Pension and Other Postretirem78

Pension and Other Postretirement Benefits - Discount Rates and Weighted-Average Wage Increases Used to Determine the Benefit Obligations (Detail)	Dec. 31, 2017	Dec. 31, 2016
Defined Benefit Pension Plan [Member] | U.S. Defined Benefit Pension Plans [Member] | U.S. [Member]
Defined Benefit Plan Disclosure [Line Items]
Wage increases	3.00%	3.00%
Defined Benefit Pension Plan [Member] | Foreign Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Discount rate	2.45%
Minimum [Member] | Defined Benefit Pension Plan [Member] | U.S. Defined Benefit Pension Plans [Member] | U.S. [Member]
Defined Benefit Plan Disclosure [Line Items]
Discount rate	3.63%	4.02%
Minimum [Member] | Defined Benefit Pension Plan [Member] | Foreign Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Discount rate		2.50%
Minimum [Member] | Other Postretirement Benefit Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Discount rate	3.46%	3.90%
Maximum [Member] | Defined Benefit Pension Plan [Member] | U.S. Defined Benefit Pension Plans [Member] | U.S. [Member]
Defined Benefit Plan Disclosure [Line Items]
Discount rate	3.72%	4.25%
Maximum [Member] | Defined Benefit Pension Plan [Member] | Foreign Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Discount rate		2.65%
Maximum [Member] | Other Postretirement Benefit Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Discount rate	3.69%	4.13%

Pension and Other Postretirem79

Pension and Other Postretirement Benefits - Assumptions Regarding Net Periodic Pension and Other Postretirement Benefit Costs (Detail)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Defined Benefit Pension Plan [Member] | U.S. Defined Benefit Pension Plans [Member] | U.S. [Member]
Defined Benefit Plan Disclosure [Line Items]
Expected long-term rate of return			8.00%
Wages increases	3.00%	3.00%	4.00%
Defined Benefit Pension Plan [Member] | Foreign Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Discount rate			3.50%
Expected long-term rate of return	4.45%	5.40%	5.40%
Other Postretirement Benefit Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Discount rate			4.00%
Minimum [Member] | Defined Benefit Pension Plan [Member] | U.S. Defined Benefit Pension Plans [Member] | U.S. [Member]
Defined Benefit Plan Disclosure [Line Items]
Discount rate	4.02%	4.20%	4.00%
Expected long-term rate of return	6.95%	6.90%
Minimum [Member] | Defined Benefit Pension Plan [Member] | Foreign Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Discount rate	2.50%	3.00%
Minimum [Member] | Other Postretirement Benefit Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Discount rate	3.90%	3.80%
Maximum [Member] | Defined Benefit Pension Plan [Member] | U.S. Defined Benefit Pension Plans [Member] | U.S. [Member]
Defined Benefit Plan Disclosure [Line Items]
Discount rate	4.25%	4.40%	4.10%
Expected long-term rate of return	7.50%	7.75%
Maximum [Member] | Defined Benefit Pension Plan [Member] | Foreign Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Discount rate	2.65%	3.65%
Maximum [Member] | Other Postretirement Benefit Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Discount rate	4.13%	4.20%

Commitments and Contingent Li80

Commitments and Contingent Liabilities - Additional Information (Detail) kr in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2017USD ($)BondAgreement	Dec. 31, 2017SEK (kr)
Commitments And Contingent Liabilities [Line Items]
Outstanding standby and commercial letters of credit | $	$ 22,576
Percentage on employees covered by collective bargaining agreements	39.00%	39.00%
Bargaining agreement beginning expiration year	2018-05
Bargaining agreement ending expiration year	2020-09
Number of collective bargaining agreements | Agreement	9
Collective Bargaining Agreement Two [Member]
Commitments And Contingent Liabilities [Line Items]
Percentage of covered employees	54.00%
Collective Bargaining Agreement One [Member]
Commitments And Contingent Liabilities [Line Items]
Percentage of covered employees	19.00%
Akers AB [Member]
Commitments And Contingent Liabilities [Line Items]
Number of surety bonds issued | Bond	2
Amount covered by guarantees	$ 4,000	kr 33,900

Stock-Based Compensation - Addi

Stock-Based Compensation - Additional Information (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	May 31, 2016	May 31, 2011
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense	$ 2,400,000	$ 2,332,000	$ 1,328,000
Income tax benefit from stock-based compensation expense	$ 0	$ 0	$ 465,000
Restricted Stock Units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted stock units vesting period, years	3 years
Performance-based Restricted Stock Units (PSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Cumulative earnings achievement period	3 years
PSUs earning conditions	(i) achievement of a targeted basic earnings per share during the performance period beginning in the year of grant and continuing for two subsequent years; (ii) achievement of a three-year cumulative relative total shareholder return as ranked against other companies included in the Corporation’s peer group; and (iii) remaining continuously employed with the Corporation through the end of the year following three years from the date of grant.
Restricted Stock Units (RSUs) and Performance-based Restricted Stock Units (PSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized stock-based compensation expense	$ 2,551,000
Unrecognized stock-based compensation expense to be recognized in period, years	2 years
Predecessor Plans [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares granted under Omnibus Incentive Plan					0
Shares of common stock issued to non-employee directors		32,090	14,310
Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares available for issuance	84,667
Shares of common stock issued to non-employee directors	50,000
Incentive Plan [Member] | Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares authorized under Omnibus Incentive Plan				1,100,000
Equity based awards grant date fair value	$ 200

Stock-Based Compensation - Summ

Stock-Based Compensation - Summary of Outstanding and Exercisable Incentive Options (RSUs and PSUs) (Detail)	12 Months Ended
	Dec. 31, 2017$ / sharesshares
Restricted Stock Units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of incentive options, Outstanding, Beginning balance | shares	155,845
Number of incentive options, Granted | shares	76,473
Number of incentive options, Converted to common stock | shares	(58,677)
Number of incentive options, Forfeited/cancelled | shares	(14,935)
Number of incentive options, Outstanding, Ending balance | shares	158,706
Weighted Average Fair Value of incentive options, Outstanding, Beginning balance | $ / shares	$ 17.53
Weighted Average Fair Value of incentive options, Granted | $ / shares	14
Weighted Average Fair Value of incentive options, Converted to common stock | $ / shares	17.25
Weighted Average Fair Value of incentive options, Forfeited/cancelled | $ / shares	16.76
Weighted Average Fair Value of incentive options, Outstanding, Ending Balance | $ / shares	$ 16
Performance-based Restricted Stock Units (PSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of incentive options, Outstanding, Beginning balance | shares	39,348
Number of incentive options, Granted | shares	97,788
Number of incentive options, Converted to common stock | shares	0
Number of incentive options, Forfeited/cancelled | shares	(34,622)
Number of incentive options, Outstanding, Ending balance | shares	102,514
Weighted Average Fair Value of incentive options, Outstanding, Beginning balance | $ / shares	$ 21.62
Weighted Average Fair Value of incentive options, Granted | $ / shares	14.93
Weighted Average Fair Value of incentive options, Converted to common stock | $ / shares	0
Weighted Average Fair Value of incentive options, Forfeited/cancelled | $ / shares	14.99
Weighted Average Fair Value of incentive options, Outstanding, Ending Balance | $ / shares	$ 17.47

Stock-Based Compensation - Su83

Stock-Based Compensation - Summary of Outstanding and Exercisable Stock Options (Detail) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Number of Shares Under Options, Outstanding, Beginning balance	1,005,836
Number of Shares Under Options, Granted	0
Number of Shares Under Options, Exercised	0
Number of Shares Under Options, Forfeited	(190,501)
Number of Shares Under Options, Outstanding, Ending balance	815,335	1,005,836
Number of Shares Under Options, Exercisable	815,335
Number of Shares Under Options, Vested or expected to vest	815,335
Weighted Average Exercise Price, Outstanding, Beginning balance	$ 24.07
Weighted Average Exercise Price, Granted	0
Weighted Average Exercise Price, Exercised	0
Weighted Average Exercise Price, Forfeited	26.03
Weighted Average Exercise Price, Outstanding, Ending balance	23.61	$ 24.07
Weighted Average Exercise Price, Exercisable	23.61
Weighted Average Exercise Price, Vested or expected to vest	$ 23.61
Remaining Contractual Life In Years, Outstanding	3 years 3 months 18 days	4 years 2 months 12 days
Remaining Contractual Life In Years, Exercisable	3 years 3 months 18 days
Remaining Contractual Life In Years, Vested or expected to vest	3 years 3 months 18 days
Intrinsic Value, Outstanding, Beginning balance	$ 0
Intrinsic Value, Outstanding, Ending balance	0	$ 0
Intrinsic Value, Exercisable	0
Intrinsic Value, Vested or expected to vest	$ 0

Accumulated Other Comprehensi84

Accumulated Other Comprehensive Loss - Net Change and Ending Balances for Various Components of Other Comprehensive Income (Loss) and Accumulated Other Comprehensive Loss (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	$ 149,834	$ 211,423	$ 205,148
Net Change	22,330	(3,400)	11,154
Stranded tax effect (Note 15)	0
Ending Balance	161,761	149,834	211,423
Foreign Currency Translation Adjustments [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	(22,973)	(8,393)	(4,426)
Net Change	11,041	(14,580)	(3,967)
Stranded tax effect (Note 15)	0
Ending Balance	(11,932)	(22,973)	(8,393)
Unrecognized Components of Employee Benefit Plans [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	(38,636)	(49,943)	(65,396)
Net Change	10,582	11,307	15,453
Stranded tax effect (Note 15)	(6,142)
Ending Balance	(34,196)	(38,636)	(49,943)
Unrealized Holding Gains on Securities [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	59	692	984
Net Change	573	(633)	(292)
Stranded tax effect (Note 15)	0
Ending Balance	632	59	692
Realized Gains/Losses from Settlement of Cash Flow Hedges [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	551	45	85
Net Change	134	506	(40)
Stranded tax effect (Note 15)	54
Ending Balance	739	551	45
AOCI Including Portion Attributable to Noncontrolling Interest [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	(60,999)	(57,599)	(68,753)
Net Change	22,330	(3,400)	11,154
Stranded tax effect (Note 15)	(6,088)
Ending Balance	$ (44,757)	$ (60,999)	$ (57,599)

Accumulated Other Comprehensi85

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								12 Months Ended
	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Net sales (foreign currency sales contracts)	$ 114,449	$ 103,886	$ 110,550	$ 103,516	$ 92,126	$ 82,861	$ 93,301	$ 63,578	$ 432,401	$ 331,866	$ 238,480
Depreciation and amortization (foreign currency purchasecontracts)									(22,387)	(20,463)	(11,787)
Costs of products sold (excluding depreciation and amortization)									(357,672)	(276,496)	(196,091)
Selling and administrative									(61,310)	(58,175)	(39,510)
Other expense									(932)	(1,074)	(475)
Income tax provision									1,355	(22,712)	(2,633)
Net (loss) income attributable to Ampco-Pittsburgh	$ (3,191)	$ (2,202)	$ (1,913)	$ (4,783)	$ (43,062)	$ (27,382)	$ (6,486)	$ (2,890)	(12,089)	(79,820)	1,373
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]
Costs of products sold (excluding depreciation and amortization)									1,934	2,463	3,604
Selling and administrative									1,148	(719)	3,354
Other expense									201	166	355
Total before income tax									3,283	1,910	7,313
Income tax provision									0	0	(2,573)
Net (loss) income attributable to Ampco-Pittsburgh									3,283	1,910	4,740
Realized Gains from Sale of Marketable Securities [Member] | Reclassification Out of Accumulated Other Comprehensive Income (Loss) [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Selling and administrative									(29)	(1,404)	(82)
Income tax provision									0	366	29
Net (loss) income attributable to Ampco-Pittsburgh									(29)	(1,038)	(53)
Realized Gains/Losses from Settlement of Cash Flow Hedges [Member] | Reclassification Out of Accumulated Other Comprehensive Income (Loss) [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Net sales (foreign currency sales contracts)									0	(6)	(17)
Depreciation and amortization (foreign currency purchasecontracts)									(31)	(27)	(27)
Costs of products sold (excluding depreciation and amortization)									(639)	220	751
Total before income tax									(670)	187	707
Income tax provision									0	(79)	(272)
Net (loss) income attributable to Ampco-Pittsburgh									$ (670)	$ 108	$ 435

Accumulated Other Comprehensi86

Accumulated Other Comprehensive Loss - Additional Information (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Valuation Allowance Against Gross Deferred Income Tax Assets [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Income tax benefit for certain items	$ 0	$ 0

Accumulated Other Comprehensi87

Accumulated Other Comprehensive Loss - Summary of Income Tax Expense (Benefit) Associated with Various Components of Other Comprehensive Income (Loss) (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Income tax expense (benefit) associated with changes in:
Unrecognized employee benefit costs	$ 0	$ 0	$ (4,731)
Unrealized holding losses on marketable securities	0	0	134
Fair value of cash flow hedges	0	0	294
Income tax expense (benefit) associated with reclassification adjustments:
Amortization of unrecognized employee benefit costs	0	0	(2,573)
Realized gains from sale of marketable securities	0	366	29
Realized losses from settlement of cash flow hedges	$ 0	$ (79)	$ (272)

Derivative Instruments - Additi

Derivative Instruments - Additional Information (Detail)	12 Months Ended
	Dec. 31, 2017USD ($)CustomerDerivative	Dec. 31, 2016USD ($)	Dec. 31, 2015USD ($)
Derivative [Line Items]
Anticipated foreign-denominated sales hedge	$ 27,414,000
Percentage of purchase commitments covering anticipated natural gas usage	62.00%
Purchase commitment amount of anticipated natural gas usage	$ 1,285,000
Number of subsidiaries purchased commitments for natural gas usage | Customer	1
Purchase commitments covering period anticipated usage, Description	For 2018 for one of its subsidiaries
Purchase of natural gas	$ 856,000	$ 1,936,000	$ 2,452,000
Number of derivative instruments holds for trading purposes | Derivative	0
(Losses) gains on foreign exchange transactions included in other income (expense)	$ (463,000)	$ (1,161,000)	$ (324,000)
Foreign Currency Sales Contract - Fair Value Hedges [Member]
Derivative [Line Items]
Fair value of assets held as collateral related to forward exchange contracts	2,025,000
Foreign Currency Sales Contract - Fair Value Hedges [Member] | Standby Letters of Credit [Member]
Derivative [Line Items]
Fair value of assets held as collateral related to forward exchange contracts	$ 1,350,000
Copper Purchases [Member]
Derivative [Line Items]
Percentage of anticipated purchases hedged	51.00%
Copper Purchases [Member] | Cash Flow Hedges [Member]
Derivative [Line Items]
Anticipated purchases, hedged	$ 2,637,000
Aluminum Purchases [Member]
Derivative [Line Items]
Percentage of anticipated purchases hedged	56.00%
Time period for hedged purchases	6 months
Aluminum Purchases [Member] | Cash Flow Hedges [Member]
Derivative [Line Items]
Anticipated purchases, hedged	$ 524,000

Derivative Instruments - Locati

Derivative Instruments - Location and Fair Value of Foreign Currency Sales Contracts Recorded on Consolidated Balance Sheets (Detail) - Foreign Currency Sales Contracts [Member] - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Receivables [Member]
Derivative [Line Items]
Fair value hedged item	$ (269)	$ 121
Other Current Assets [Member]
Derivative [Line Items]
Fair value hedge contracts	961	214
Fair value hedged item	169	808
Other Noncurrent Assets [Member]
Derivative [Line Items]
Fair value hedge contracts	0	2
Fair value hedged item	16	45
Other Current Liabilities [Member]
Derivative [Line Items]
Fair value hedge contracts	89	940
Fair value hedged item	907	233
Other Noncurrent Liabilities [Member]
Derivative [Line Items]
Fair value hedge contracts	1	35
Fair value hedged item	$ 0	$ 5

Derivative Instruments - Summar

Derivative Instruments - Summary of Amount Recognized as and Reclassified from Accumulated Other Comprehensive Income (Loss) (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Derivative [Line Items]
Accumulated Other Comprehensive Income (Loss) Beginning of the Year	$ 551	$ 45	$ 85
Fair value of cash flow hedges	804	398	(475)
Less Gain (Loss) Reclassified from Accumulated Other Comprehensive Loss	670	(108)	(435)
Accumulated Other Comprehensive Income (Loss) End of the Year	685	551	45
Foreign Currency Sales Contracts [Member] | Cash Flow Hedges [Member]
Derivative [Line Items]
Accumulated Other Comprehensive Income (Loss) Beginning of the Year	0	4	0
Fair value of cash flow hedges	0	0	14
Less Gain (Loss) Reclassified from Accumulated Other Comprehensive Loss	0	4	10
Accumulated Other Comprehensive Income (Loss) End of the Year	0	0	4
Foreign Currency Purchase Contracts [Member]
Derivative [Line Items]
Accumulated Other Comprehensive Income (Loss) Beginning of the Year	216	241	258
Fair value of cash flow hedges	0	0	0
Less Gain (Loss) Reclassified from Accumulated Other Comprehensive Loss	31	25	17
Accumulated Other Comprehensive Income (Loss) End of the Year	185	216	241
Futures Contracts - Copper and Aluminum [Member]
Derivative [Line Items]
Accumulated Other Comprehensive Income (Loss) Beginning of the Year	335	(200)	(173)
Fair value of cash flow hedges	804	398	(489)
Less Gain (Loss) Reclassified from Accumulated Other Comprehensive Loss	639	(137)	(462)
Accumulated Other Comprehensive Income (Loss) End of the Year	$ 500	$ 335	$ (200)

Derivative Instruments - Summ91

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								12 Months Ended
	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Derivative [Line Items]
Amount released to pre - tax earnings	$ (3,191)	$ (2,202)	$ (1,913)	$ (4,783)	$ (43,062)	$ (27,382)	$ (6,486)	$ (2,890)	$ (12,089)	$ (79,820)	$ 1,373
Foreign Currency Sales Contracts [Member] | Cash Flow Hedges [Member]
Derivative [Line Items]
Amount released to pre - tax earnings	0								0
Amount released to pre - tax earnings									0	6	17
Foreign Currency Purchase Contracts [Member]
Derivative [Line Items]
Amount released to pre - tax earnings	27								27
Amount released to pre - tax earnings									31	27	27
Futures Contracts - Copper and Aluminum [Member]
Derivative [Line Items]
Amount released to pre - tax earnings	$ 500								500
Amount released to pre - tax earnings									$ 639	$ (220)	$ (751)

Fair Value - Fair Value of Fina

Fair Value - Fair Value of Financial Assets and Liabilities (Detail) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Foreign Currency Exchange Contracts [Member] | Other Noncurrent Assets [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Assets, fair value	$ 16	$ 47
Foreign Currency Exchange Contracts [Member] | Other Current Assets [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Assets, fair value	1,130	1,022
Foreign Currency Exchange Contracts [Member] | Other Current Liabilities [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Liabilities, fair value	996	1,173
Foreign Currency Exchange Contracts [Member] | Other Noncurrent Liabilities [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Liabilities, fair value	1	40
Investments [Member] | Other Noncurrent Assets [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Assets, fair value	4,204	3,863
Quoted Prices in Active Markets for Identical Inputs (Level 1) [Member] | Foreign Currency Exchange Contracts [Member] | Other Noncurrent Assets [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Assets, fair value	0	0
Quoted Prices in Active Markets for Identical Inputs (Level 1) [Member] | Foreign Currency Exchange Contracts [Member] | Other Current Assets [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Assets, fair value	0	0
Quoted Prices in Active Markets for Identical Inputs (Level 1) [Member] | Foreign Currency Exchange Contracts [Member] | Other Current Liabilities [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Liabilities, fair value	0	0
Quoted Prices in Active Markets for Identical Inputs (Level 1) [Member] | Foreign Currency Exchange Contracts [Member] | Other Noncurrent Liabilities [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Liabilities, fair value	0	0
Quoted Prices in Active Markets for Identical Inputs (Level 1) [Member] | Investments [Member] | Other Noncurrent Assets [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Assets, fair value	4,204	3,863
Significant Other Observable Inputs (Level 2) [Member] | Foreign Currency Exchange Contracts [Member] | Other Noncurrent Assets [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Assets, fair value	16	47
Significant Other Observable Inputs (Level 2) [Member] | Foreign Currency Exchange Contracts [Member] | Other Current Assets [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Assets, fair value	1,130	1,022
Significant Other Observable Inputs (Level 2) [Member] | Foreign Currency Exchange Contracts [Member] | Other Current Liabilities [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Liabilities, fair value	996	1,173
Significant Other Observable Inputs (Level 2) [Member] | Foreign Currency Exchange Contracts [Member] | Other Noncurrent Liabilities [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Liabilities, fair value	1	40
Significant Other Observable Inputs (Level 2) [Member] | Investments [Member] | Other Noncurrent Assets [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Assets, fair value	0	0
Significant Unobservable Inputs (Level 3) [Member] | Foreign Currency Exchange Contracts [Member] | Other Noncurrent Assets [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Assets, fair value	0	0
Significant Unobservable Inputs (Level 3) [Member] | Foreign Currency Exchange Contracts [Member] | Other Current Assets [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Assets, fair value	0	0
Significant Unobservable Inputs (Level 3) [Member] | Foreign Currency Exchange Contracts [Member] | Other Current Liabilities [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Liabilities, fair value	0	0
Significant Unobservable Inputs (Level 3) [Member] | Foreign Currency Exchange Contracts [Member] | Other Noncurrent Liabilities [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Liabilities, fair value	0	0
Significant Unobservable Inputs (Level 3) [Member] | Investments [Member] | Other Noncurrent Assets [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Assets, fair value	$ 0	$ 0

Income Taxes - Additional Infor

Income Taxes - Additional Information (Detail) - USD ($)	Dec. 22, 2017	Dec. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Income Tax Contingency [Line Items]
U.S. corporate statutory income tax rate				35.00%
Tax cuts and jobs act of 2017, Incomplete accounting, income tax provision		$ 1,565,000
Tax cuts and jobs act of 2017, Incomplete accounting, repatriation transition tax percentage	100.00%
Accumulated other comprehensive loss reclassified to retained earnings				$ 0
Operating loss carryforwards, limitations on use				operating losses can be carried forward indefinitely, but are limited to 80 percent of taxable income in any given year
Deferred tax liability recorded		0		$ 0	$ 0
Unrecognized tax benefits		31,000		$ 31,000
Reversal period of unrecognized tax benefits due to lapse in statue of limitations				Within the next 12 months
Domestic Tax Authority [Member]
Income Tax Contingency [Line Items]
Net operating loss carryforwards		3,208,000		$ 3,208,000
Operating loss carry forwards expiration period				2,035
Income tax refund received				$ 6,540,000
State [Member]
Income Tax Contingency [Line Items]
Net operating loss carryforwards		34,495,000		$ 34,495,000
Operating loss carry forwards expiration period				2,018
Foreign Tax Authority [Member]
Income Tax Contingency [Line Items]
Net operating loss carryforwards		93,364,000		$ 93,364,000
Operating loss carry forwards expiration period				2,018
Capital loss carryforwards		814,000		$ 814,000
Capital loss carry forwards expiration period				Capital loss carryforwards of $814 which do not expire
Reverse in the Next Twelve Months [Member]
Income Tax Contingency [Line Items]
Unrecognized tax benefits		$ 117,000		$ 117,000
Retained Earnings [Member]
Income Tax Contingency [Line Items]
Accumulated other comprehensive loss reclassified to retained earnings				$ 6,088,000
Scenario Forecast [Member]
Income Tax Contingency [Line Items]
U.S. corporate statutory income tax rate			21.00%

Income Taxes - (Loss) Income Be

Income Taxes - (Loss) Income Before Income Taxes and Equity Gains (Losses) in Joint Venture (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Income Tax Disclosure [Abstract]
Domestic	$ (16,988)	$ (26,326)	$ 6,000
Foreign	3,295	(31,194)	(1,480)
(Loss) income before income taxes and equity gains (losses) in joint venture	$ (13,693)	$ (57,520)	$ 4,520

Income Taxes - Income Tax (Bene

Income Taxes - Income Tax (Benefit) Provision (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Current:
Federal	$ (4,698)	$ (1,574)	$ 4,577
State	(440)	465	378
Foreign	606	414	(20)
Current income tax (benefit) provision	(4,532)	(695)	4,935
Deferred:
Federal	1,259	(2,688)	(2,203)
State	(112)	(1,838)	197
Foreign	1,876	(2,472)	(296)
Increase in valuation allowance	154	30,405	0
Deferred income tax provision (benefit)	3,177	23,407	(2,302)
Total income tax (benefit) provision	$ (1,355)	$ 22,712	$ 2,633

Income Taxes - Difference Betwe

Income Taxes - Difference Between Statutory U.S. Federal Income Tax and the Corporation's Effective Income Tax (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Income Tax Disclosure [Abstract]
Computed at statutory rate	$ (4,428)	$ (19,984)	$ 1,402
Tax differential on non-U.S. earnings	(389)	1,790	106
State income taxes	(398)	(1,535)	226
Manufacturers deduction (I.R.C. Section 199)	0	204	(433)
Meals and entertainment	142	143	136
Tax credits	0	0	(243)
Goodwill impairment	0	9,191	0
Increase in valuation allowance	154	30,405	0
Repatriation transition tax impact	3,284	0	0
Change in tax rates	0	1,913	224
Change in uncertain tax positions	0	114	91
Acquisition-related costs	0	571	981
Other – net	280	(100)	143
Total income tax (benefit) provision	$ (1,355)	$ 22,712	$ 2,633

Income Taxes - Deferred Income

Income Taxes - Deferred Income Tax Assets and Liabilities (Detail) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Assets:
Employment – related liabilities	$ 10,975	$ 18,659
Liabilities related to discontinued operations	186	241
Capital loss carryforwards	308	282
Asbestos-related liability	12,179	21,024
Net operating loss – domestic	674	653
Net operating loss – state	2,782	2,123
Net operating loss – foreign	22,856	19,106
Inventory related	2,764	2,157
Impairment charge associated with investment in MG	1,155	2,184
Investment tax credits – foreign	848	791
Other	3,181	6,660
Gross deferred income tax assets	68,545	92,254
Valuation allowance	(38,112)	(45,449)
Deferred tax assets, net, Total	30,433	46,805
Liabilities:
Depreciation	(26,915)	(37,584)
Mark-to-market adjustment – derivatives	(4)	(187)
Intangible assets – definite life	(1,186)	(2,067)
Intangible assets – indefinite life	(605)	(731)
Other	(566)	(2,003)
Gross deferred income tax liabilities	(29,276)	(42,572)
Net deferred income tax assets	1,157	4,233
Foreign Tax Authority [Member]
Assets:
Pension liability	1,633	2,241
Domestic Tax Authority [Member]
Assets:
Pension liability	$ 9,004	$ 16,133

Income Taxes - Deferred Incom98

Income Taxes - Deferred Income Tax Assets and Liabilities (Parenthetical) (Detail)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Income Tax Contingency [Line Items]
U.S. corporate statutory income tax rate		35.00%
Scenario Plan [Member]
Income Tax Contingency [Line Items]
U.S. corporate statutory income tax rate	21.00%

Income Taxes - Summary of Chang

Income Taxes - Summary of Changes in Unrecognized Tax Benefits (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Income Tax Disclosure [Abstract]
Balance at the beginning of the year	$ 236	$ 315	$ 52
Gross increases for tax positions taken in the current year	0	0	0
Gross increases for tax positions taken in prior years	0	0	283
Gross decreases in tax positions due to lapse in statute of limitations	(119)	(79)	(20)
Gross decreases for tax positions taken in prior years	0	0	0
Gross decreases for tax settlements with taxing authorities	0	0	0
Balance at the end of the year	$ 117	$ 236	$ 315

Operating Leases - Additional I

Operating Leases - Additional Information (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Leases [Abstract]
Operating lease expense	$ 1,283	$ 1,148	$ 1,043
Operating lease payments, in 2018	702
Operating lease payments, in 2019	628
Operating lease payments, in 2020	524
Operating lease payments, in 2021	486
Operating lease payments, in 2022	476
Operating lease payments, thereafter	$ 902

Research and Development Costs

Research and Development Costs - Additional Information (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Research And Development [Abstract]
Expenses relating to product development	$ 3,386	$ 2,716	$ 1,137

Related Parties - Additional In

Related Parties - Additional Information (Detail) ¥ in Thousands	12 Months Ended
	Dec. 31, 2017USD ($)	Dec. 31, 2017CNY (¥)	Dec. 31, 2016USD ($)	Dec. 31, 2016CNY (¥)	Dec. 31, 2015USD ($)	Dec. 31, 2017CNY (¥)	Dec. 31, 2016CNY (¥)
Related Party Transaction [Line Items]
Accrued interest	$ 2,697,000		$ 2,274,000
LB Co [Member]
Related Party Transaction [Line Items]
Purchases			955,000		$ 1,270,000
LB Co paid Corporation for administrative services					$ 72,000
Net amount payable	0		0
ATR [Member]
Related Party Transaction [Line Items]
Purchases	7,752,000	¥ 52,418	6,362,000	¥ 42,403
LB Co paid Corporation for administrative services	296,000	¥ 1,929	899,000	6,237
Loan outstanding	$ 5,325,000					¥ 34,655
Debt, interest rate	5.00%					5.00%
Accrued interest	$ 2,682,000		2,265,000			¥ 17,457	¥ 15,730
Debt, maturity date	2,008	2,008
Debt, renewal period	1 year	1 year
Sales	$ 8,564,000	¥ 57,909	5,922,000	¥ 39,468
Due from related parties	$ 0		$ 0
ATR [Member] | Minimum [Member]
Related Party Transaction [Line Items]
Interest accrual period	3 years	3 years
ATR [Member] | Maximum [Member]
Related Party Transaction [Line Items]
Interest accrual period	5 years	5 years

Litigation - Schedule of Loss C

Litigation - Schedule of Loss Contingencies by Contingency (Detail) - Asbestos Claims [Member]	12 Months Ended
	Dec. 31, 2017USD ($)Claim	Dec. 31, 2016USD ($)Claim
Loss Contingencies [Line Items]
Total claims pending at the beginning of the period	6,618	6,212
New claims served	1,365	1,452
Claims dismissed	(718)	(782)
Claims settled	(358)	(264)
Total claims pending at the end of the period	6,907	6,618
Gross settlement and defense costs | $	$ 21,431,000	$ 17,960,000
Average gross settlement and defense costs per claim resolved | $	$ 19,920	$ 17,170

Litigation - Schedule of Los104

Litigation - Schedule of Loss Contingencies by Contingency (Parenthetical) (Detail) - Claim	Dec. 31, 2017	Dec. 31, 2016
Commitments And Contingencies Disclosure [Abstract]
Number of claims inactive or transferred to MDL panel	479	444

Litigation - Additional Informa

Litigation - Additional Information (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2017
Commitments And Contingencies Disclosure [Abstract]
Reserves for total costs for asbestos liability claims pending or projected	$ 171,181	$ 149,750
Percentage attributable to settlement costs for unasserted claims projected to be filed	70.00%
Insurance recoveries receivable	$ 115,945	$ 100,342

Litigation - Summary of Activit

Litigation - Summary of Activity in Asbestos Insurance Recoveries (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Loss Contingencies [Line Items]
Insurance receivable - asbestos, beginning of the year	$ 115,945
Insurance receivable - asbestos, end of the year	100,342	$ 115,945
Asbestos Claims [Member]
Loss Contingencies [Line Items]
Insurance receivable - asbestos, beginning of the year	115,945	125,423
Settlement and defense costs paid by insurance carriers	(15,603)	(23,138)
Changes in estimated coverage	0	13,660
Insurance receivable - asbestos, end of the year	$ 100,342	$ 115,945

Litigation - Summary of Acti107

Litigation - Summary of Activity in Asbestos Insurance Recoveries (Parenthetical) (Detail) $ in Thousands	12 Months Ended
	Dec. 31, 2016USD ($)
Commitments And Contingencies Disclosure [Abstract]
Cash settlement with an insurance carrier	$ 9,808

Environmental Matters - Additio

Environmental Matters - Additional Information (Detail) $ in Thousands	Dec. 31, 2017USD ($)
Environmental Remediation Obligations [Abstract]
Potential liability for all environmental compliance	$ 440

Business Segments - Additional

Business Segments - Additional Information (Detail)	12 Months Ended
	Dec. 31, 2017Segment
Segment Reporting [Abstract]
Number of reportable business segments	2

Business Segments - Business Se

Business Segments - Business Segment Net Sales and (Loss) Income before Income Taxes (Detail) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Revenue from External Customer [Line Items]
Net sales	$ 114,449	$ 103,886	$ 110,550	$ 103,516	$ 92,126	$ 82,861	$ 93,301	$ 63,578	$ 432,401	$ 331,866	$ 238,480
(Loss) Income Before Income Taxes and Equity Gains (Losses) in Joint Venture									(13,693)	(57,520)	4,520
Capital Expenditures									14,899	10,566	9,407
Depreciation and amortization									22,387	20,463	11,787
Identifiable Assets	565,599				565,889				565,599	565,889	506,156
Long-Lived Assets	323,762				339,601				323,762	339,601	265,905
Forged and Cast Mill Rolls [Member]
Revenue from External Customer [Line Items]
Net sales									254,638	230,531	129,499
Forged Engineered Products [Member]
Revenue from External Customer [Line Items]
Net sales									89,891	17,121	22,768
Heat Exchange Coils [Member]
Revenue from External Customer [Line Items]
Net sales									28,998	28,139	32,745
Centrifugal Pumps [Member]
Revenue from External Customer [Line Items]
Net sales									35,607	36,359	33,120
Air Handling Systems [Member]
Revenue from External Customer [Line Items]
Net sales									23,267	19,716	20,348
U.S. [Member]
Revenue from External Customer [Line Items]
Net sales									236,856	159,531	126,417
(Loss) Income Before Income Taxes and Equity Gains (Losses) in Joint Venture									(18,122)	(25,906)	5,855
Long-Lived Assets	235,646				206,460				235,646	206,460	236,707
Foreign [Member]
Revenue from External Customer [Line Items]
Net sales									195,545	172,335	112,063
(Loss) Income Before Income Taxes and Equity Gains (Losses) in Joint Venture									4,429	(31,614)	(1,335)
Long-Lived Assets	88,116				133,141				88,116	133,141	29,198
Operating Segments [Member]
Revenue from External Customer [Line Items]
Net sales									432,401	331,866	238,480
(Loss) Income Before Income Taxes and Equity Gains (Losses) in Joint Venture									8,601	(37,755)	19,722
Corporate Costs, Including Other Income (Expense) [Member]
Revenue from External Customer [Line Items]
Net sales									0	0	0
(Loss) Income Before Income Taxes and Equity Gains (Losses) in Joint Venture									(22,294)	(19,765)	(15,202)
Capital Expenditures									174	741	305
Depreciation and amortization									191	114	57
Identifiable Assets	19,031				44,541				19,031	44,541	94,414
Forged and Cast Engineered Products [Member] | Operating Segments [Member]
Revenue from External Customer [Line Items]
Net sales									344,529	247,652	152,267
(Loss) Income Before Income Taxes and Equity Gains (Losses) in Joint Venture									(1,826)	(42,878)	(3,444)
Capital Expenditures									14,165	9,440	8,608
Depreciation and amortization									21,124	19,166	10,468
Identifiable Assets	414,227				348,331				414,227	348,331	228,718
Air and Liquid Processing [Member] | Operating Segments [Member]
Revenue from External Customer [Line Items]
Net sales									87,872	84,214	86,213
(Loss) Income Before Income Taxes and Equity Gains (Losses) in Joint Venture									10,427	5,123	23,166
Capital Expenditures									560	385	494
Depreciation and amortization									1,072	1,183	1,262
Identifiable Assets	$ 132,341				$ 173,017				$ 132,341	$ 173,017	$ 183,024

Business Segments - Business111

Business Segments - Business Segment Net Sales and (Loss) Income before Income Taxes (Parenthetical) (Detail) $ in Thousands	12 Months Ended
	Dec. 31, 2017USD ($)Customer	Dec. 31, 2016USD ($)Customer	Dec. 31, 2015USD ($)Customer
Revenue from External Customer [Line Items]
Investments in joint ventures	$ 2,175	$ 2,019
Change in the identifiable assets of the Air and Liquid / Long-lived assets	$ 87,342	$ 102,945	$ 108,423
Number of customers accounted for net sales | Customer		1
Sales Revenue, Net [Member] | Individual Countries [Member] | Maximum [Member]
Revenue from External Customer [Line Items]
Net sales	10.00%	10.00%	10.00%
Sales Revenue, Net [Member] | Customer Concentration Risk [Member]
Revenue from External Customer [Line Items]
Net sales		11.00%
Forged and Cast Engineered Products [Member]
Revenue from External Customer [Line Items]
Write off of goodwill associated with the Akers acquisition		$ 26,676
Investments in joint ventures	$ 2,175	$ 2,019	$ 3,097
Number of customers accounted for net sales | Customer	0	2	2
Forged and Cast Engineered Products [Member] | Sales Revenue, Net [Member] | Customer Concentration Risk [Member] | Customer Two [Member]
Revenue from External Customer [Line Items]
Net sales	10.00%	24.00%	33.00%
Air and Liquid Processing [Member]
Revenue from External Customer [Line Items]
Estimated costs of asbestos-related litigation, net of estimated insurance recoveries		$ 4,565	$ 14,333
Number of customers accounted for net sales | Customer	0	1	0
Air and Liquid Processing [Member] | Sales Revenue, Net [Member] | Customer Concentration Risk [Member]
Revenue from External Customer [Line Items]
Net sales	10.00%	10.00%	10.00%
Air and Liquid Processing [Member] | U.S. [Member]
Revenue from External Customer [Line Items]
Change in the identifiable assets of the Air and Liquid / Long-lived assets	$ 100,342	$ 115,945	$ 125,423

Quarterly Information - Quarter

Quarterly Information - Quarterly Information - Unaudited (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Quarterly Financial Information Disclosure [Abstract]
Net sales	$ 114,449	$ 103,886	$ 110,550	$ 103,516	$ 92,126	$ 82,861	$ 93,301	$ 63,578	$ 432,401	$ 331,866	$ 238,480
Gross profit	20,752	16,591	18,533	18,853	11,454	15,594	15,849	12,473
Amount released to pre - tax earnings	$ (3,191)	$ (2,202)	$ (1,913)	$ (4,783)	$ (43,062)	$ (27,382)	$ (6,486)	$ (2,890)	$ (12,089)	$ (79,820)	$ 1,373
Net (loss) income per common share attributable to Ampco-Pittsburgh:
Basic	$ (0.26)	$ (0.18)	$ (0.16)	$ (0.39)	$ (3.51)	$ (2.23)	$ (0.53)	$ (0.26)	$ (0.98)	$ (6.68)	$ 0.13
Diluted	$ (0.26)	$ (0.18)	$ (0.16)	$ (0.39)	$ (3.51)	$ (2.23)	$ (0.53)	$ (0.26)	$ (0.98)	$ (6.68)	$ 0.13
Comprehensive (loss) income attributable to Ampco-Pittsburgh	$ 7,320	$ 1,660	$ 2,952	$ (1,808)	$ (47,972)	$ (22,894)	$ (10,739)	$ (1,501)	$ 10,124	$ (83,106)	$ 12,527

Quarterly Information - Quar113

Quarterly Information - Quarterly Information - Unaudited (Parenthetical) (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended				12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Quarterly Financial Information Disclosure [Abstract]
Unfavorable net impact related to the new U.S. Tax Cuts and Jobs Act legislation	$ 1,565
Unfavorable net impact per common share related to the new U.S. Tax Cuts and Jobs Act legislation	$ 0.13
Valuation allowance		$ 2,083	$ 26,903	$ 1,419
After-tax charge		$ 4,565				$ 26,676
After-tax charge per common share to recognize		$ 0.38				$ 2.23
Unrecognized employee benefit costs			$ 4,762		$ 7,299	$ 9,397	$ 10,713

Schedule II - Valuation and Qua

Schedule II - Valuation and Qualifying Accounts (Detail) - USD ($) $ in Thousands	3 Months Ended			12 Months Ended
	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Valuation And Qualifying Accounts Disclosure [Line Items]
Other	$ 2,083	$ 26,903	$ 1,419
Allowance for Doubtful Accounts [Member]
Valuation And Qualifying Accounts Disclosure [Line Items]
Balance at Beginning of Period				$ 2,228	$ 983	$ 1,374
Charged to Costs and Expenses				317	1,598	408
Charged to Other Accounts				(1,355)	0	(762)
Deductions				(230)	(353)	(25)
Other				2	0	(12)
Balance at End of Period	2,228			962	2,228	983
Valuation Allowance Against Gross Deferred Income Tax Assets [Member]
Valuation And Qualifying Accounts Disclosure [Line Items]
Balance at Beginning of Period				45,449	2,481	3,254
Charged to Costs and Expenses				0	0	0
Charged to Other Accounts				154	30,405	(715)
Deductions				(7,990)	0	0
Other				499	12,563	(58)
Balance at End of Period	$ 45,449			$ 38,112	$ 45,449	$ 2,481

Schedule II - Valuation and 115

Schedule II - Valuation and Qualifying Accounts (Parenthetical) (Detail)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Valuation And Qualifying Accounts Disclosure [Line Items]
U.S. corporate statutory income tax rate		35.00%
Scenario Plan [Member]
Valuation And Qualifying Accounts Disclosure [Line Items]
U.S. corporate statutory income tax rate	21.00%