Gentherm (THRM) 10-K 20 Feb 20 2019 FY Annual report Financial data

Document and Entity Information

Document and Entity Information - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Feb. 14, 2020	Jun. 28, 2019
Cover [Abstract]
Document Type	10-K
Amendment Flag	false
Document Period End Date	Dec. 31, 2019
Document Fiscal Year Focus	2019
Document Fiscal Period Focus	FY
Trading Symbol	THRM
Entity Registrant Name	GENTHERM INCORPORATED
Entity Central Index Key	0000903129
Entity Current Reporting Status	Yes
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Common Stock, Shares Outstanding		32,803,041
Entity Shell Company	false
Entity File Number	0-21810
Entity Tax Identification Number	95-4318554
Entity Address, Address Line One	21680 Haggerty Road
Entity Address, City or Town	Northville
Entity Address, State or Province	MI
Entity Address, Postal Zip Code	48167
City Area Code	248
Local Phone Number	504-0500
Entity Interactive Data Current	Yes
Entity Incorporation, State or Country Code	MI
Security Exchange Name	NASDAQ
Title of 12(b) Security	Common Stock, no par value
Document Transition Report	false
Entity Well-known Seasoned Issuer	Yes
Entity Voluntary Filers	No
Entity Public Float			$ 1,378,276,957
Document Annual Report	true
Documents Incorporated by Reference	DOCUMENTS INCORPORATED BY REFERENCE Portions of the proxy statement for the 2020 annual meeting of shareholders are incorporated by reference into Part III of this Report to the extent described herein.

Consolidated Balance Sheets

Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Current Assets:
Cash and cash equivalents	$ 50,443	$ 39,620
Restricted cash	2,505
Accounts receivable, less allowance of $1,193 and $851, respectively	159,710	166,858
Inventory, net	118,479	112,535
Assets held for sale		69,699
Other current assets	42,726	54,363
Total current assets	373,863	443,075
Property and equipment, net of accumulated depreciation of $129,458 and $98,705, respectively	160,605	171,380
Goodwill	64,572	55,311
Other intangible assets, net of accumulated amortization of $89,112 and $81,198, respectively	49,783	56,385
Operating lease right-of-use assets	11,587
Deferred income tax assets	57,650	64,024
Other non-current assets	9,326	12,872
Total assets	727,386	803,047
Current Liabilities:
Accounts payable	83,035	93,113
Current lease liabilities	4,586
Current maturities of long-term debt	2,500	3,413
Liabilities held for sale		13,062
Other current liabilities	66,583	65,808
Total current liabilities	156,704	175,396
Long-term debt, less current maturities	78,124	136,477
Pension benefit obligation	8,057	7,211
Non-current lease liabilities	6,751
Deferred income tax liabilities	1,357	1,177
Other non-current liabilities	3,743	3,087
Total liabilities	254,736	323,348
Common Stock:
No par value; 55,000,000 shares authorized, 32,674,354 and 33,856,629 issued and outstanding at December 31, 2019 and December 31, 2018, respectively	102,507	140,300
Paid-in capital	10,852	14,934
Accumulated other comprehensive loss	(42,441)	(39,500)
Accumulated earnings	401,732	363,965
Total shareholders’ equity	472,650	479,699
Total liabilities and shareholders’ equity	$ 727,386	$ 803,047

Consolidated Balance Sheets (Pa

Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Statement Of Financial Position [Abstract]
Accounts receivable, allowance	$ 1,193	$ 851
Accumulated depreciation	129,458	98,705
Accumulated amortization	$ 89,112	$ 81,198
Common Stock, par value
Common Stock, shares authorized	55,000,000	55,000,000
Common Stock, shares issued	32,674,354	33,856,629
Common Stock, shares outstanding	32,674,354	33,856,629

Consolidated Statements of Inco

Consolidated Statements of Income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Income Statement [Abstract]
Product revenues	$ 971,684	$ 1,048,505	$ 993,991
Type of Revenue [Extensible List]	us-gaap:ProductMember	us-gaap:ProductMember	us-gaap:ProductMember
Cost of sales	$ 683,349	$ 743,647	$ 674,796
Gross margin	288,335	304,858	319,195
Operating expenses:
Research and development expenses	91,033	98,663	94,515
Reimbursed research and development expenses	(18,557)	(18,763)	(12,037)
Net research and development expenses	72,476	79,900	82,478
Selling, general and administrative expenses	118,680	137,398	139,619
Restructuring expenses	12,919	14,772
Total operating expenses	204,075	232,070	222,097
Operating income	84,260	72,788	97,098
Interest expense, net	(4,763)	(4,942)	(4,885)
Foreign currency gain (loss)	2,326	622	(23,108)
Asset impairments and net loss on divestitures	(22,793)	(11,476)
Other income	121	1,127	150
Earnings before income tax	59,151	58,119	69,255
Income tax expense	21,645	16,220	34,028
Net income	$ 37,506	$ 41,899	$ 35,227
Basic earnings per share	$ 1.13	$ 1.17	$ 0.96
Diluted earnings per share	$ 1.13	$ 1.16	$ 0.96
Weighted average number of shares – basic	33,120,076	35,920,782	36,720,749
Weighted average number of shares – diluted	33,297,589	36,177,144	36,813,719

Consolidated Statements of Comp

Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Statement Of Income And Comprehensive Income [Abstract]
Net income	$ 37,506	$ 41,899	$ 35,227
Other comprehensive income (loss), gross of tax:
Net (loss) gain on pension benefit obligations	(1,264)	91	244
Foreign currency translation adjustments (loss) gain	(2,415)	(19,212)	48,059
Unrealized gain on foreign currency derivative securities	1,151	1,096	301
Unrealized (loss) gain on commodity derivative securities		(218)	55
Other comprehensive (loss) gain, gross of tax	(2,528)	(18,243)	48,659
Other comprehensive income (loss), related tax effect:
Cumulative effect of accounting change due to ASU 2018-02		(40)
Net gain (loss) on pension benefit obligations	232	(15)	(60)
Foreign currency translation adjustments (loss) gain	(393)	(390)	148
Unrealized loss on foreign currency derivative securities	(252)	(300)	(81)
Unrealized loss on commodity derivative securities		(68)	(19)
Other comprehensive loss, related tax effect	(413)	(813)	(12)
Other comprehensive loss, net of tax	(2,941)	(19,056)	48,647
Comprehensive income	$ 34,565	$ 22,843	$ 83,874

Consolidated Statements of Chan

Consolidated Statements of Changes In Shareholders' Equity - USD ($) $ in Thousands	Total	Common Stock	Additional Paid-in Capital	AOCI Attributable to Parent	Retained Earnings
Beginning Balance at Dec. 31, 2016	$ 460,405	$ 262,251	$ 10,323	$ (69,091)	$ 256,922
Beginning Balance (in shares) at Dec. 31, 2016		36,534,000
Cumulative effect of accounting change due to adoption of ASU | ASU 2016-09	1,496				1,496
Stock repurchase	(5,326)	$ (5,326)
Stock repurchase (in shares)		(164,000)
Exercise of Common Stock options for cash	$ 2,755	$ 3,662	(907)
Exercise of Common Stock options for cash (in shares)	202,328	202,000
Cancellation of restricted stock	$ (1,837)	$ (1,837)
Cancelation of restricted stock (in shares)		(53,000)
Stock option compensation	6,209		6,209
Common stock issued to Board of Directors and employees	6,298	$ 6,298
Commons stock issued to Board of Directors and employees (in shares)		242,000
Currency translation, net	48,207			48,207
Foreign currency hedge, net	220			220
Commodity hedge, net	36			36
Net gain (loss) on pension benefit obligation, net	184			184
Net income	35,227				35,227
Ending Balance at Dec. 31, 2017	553,874	$ 265,048	15,625	(20,444)	293,645
Ending Balance (in shares) at Dec. 31, 2017		36,761,000
Cumulative effect of accounting change due to adoption of ASU | ASU 2016-16	31,645				31,645
Cumulative effect of accounting change due to adoption of ASU | ASU 2018-02				(40)	40
Cumulative effect of accounting change due to adoption of ASU | ASU 2014-09	(3,264)				(3,264)
Stock repurchase	(148,074)	$ (148,074)
Stock repurchase (in shares)		(3,470,000)
Exercise of Common Stock options for cash	$ 14,776	$ 18,755	(3,979)
Exercise of Common Stock options for cash (in shares)	615,358	615,000
Cancellation of restricted stock	$ (1,188)	$ (1,188)
Cancelation of restricted stock (in shares)		(71,000)
Stock option compensation	3,288		3,288
Common stock issued to Board of Directors and employees	5,759	$ 5,759
Commons stock issued to Board of Directors and employees (in shares)		22,000
Currency translation, net	(19,602)			(19,602)
Foreign currency hedge, net	796			796
Commodity hedge, net	(286)			(286)
Net gain (loss) on pension benefit obligation, net	76			76
Net income	41,899				41,899
Ending Balance at Dec. 31, 2018	$ 479,699	$ 140,300	14,934	(39,500)	363,965
Ending Balance (in shares) at Dec. 31, 2018	33,856,629	33,857,000
Cumulative effect of accounting change due to adoption of ASU | ASU 2016-02	$ 261				261
Stock repurchase	(63,283)	$ (63,283)
Stock repurchase (in shares)		(1,595,000)
Exercise of Common Stock options for cash	$ 16,557	$ 21,524	(4,967)
Exercise of Common Stock options for cash (in shares)	428,250	431,000
Cancellation of restricted stock	$ (1,402)	$ (1,402)
Cancelation of restricted stock (in shares)		(62,000)
Stock option compensation	885		885
Common stock issued to Board of Directors and employees	5,368	$ 5,368
Commons stock issued to Board of Directors and employees (in shares)		43,000
Currency translation, net	(2,808)			(2,808)
Foreign currency hedge, net	899			899
Net gain (loss) on pension benefit obligation, net	(1,032)			(1,032)
Net income	37,506				37,506
Ending Balance at Dec. 31, 2019	$ 472,650	$ 102,507	$ 10,852	$ (42,441)	$ 401,732
Ending Balance (in shares) at Dec. 31, 2019	32,674,354	32,674,000

Consolidated Statements of Cash

Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Operating Activities:
Net income	$ 37,506	$ 41,899	$ 35,227
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	44,246	50,638	44,972
Deferred income taxes	3,617	6,699	5,135
Stock based compensation	6,253	9,047	12,507
Defined benefit plan (income) expense	(570)	82	(23)
Provision of doubtful accounts	353	(1)	(469)
Loss on sale of property and equipment	462	2,602	1,042
Operating lease expense	6,173
Asset impairments and net loss on divestitures	22,793	11,476
Other	1,612
Changes in assets and liabilities:
Accounts receivable	6,801	3,024	6,033
Inventory	(3,859)	(7,689)	(4,348)
Other current assets	7,996	(4,428)	(12,334)
Accounts payable	(10,253)	12,380	(7,691)
Other current liabilities	(4,327)	(7,295)	(30,171)
Net cash provided by operating activities	118,803	118,434	49,880
Investing Activities:
Acquisition of business, net of cash acquired	(14,823)	(15)	(66,994)
Proceeds from the sale of property and equipment	219	799	91
Proceeds from divestitures of businesses, net	44,173
Purchases of property and equipment	(23,729)	(41,541)	(50,785)
Net cash provided by (used in) investing activities	5,840	(40,757)	(117,688)
Financing Activities:
Borrowing of debt	37,812	94,679
Repayments of debt	(96,999)	(99,460)	(27,156)
Cash paid for financing costs	(1,278)
Cash paid for the cancellation of restricted stock	(1,402)	(1,188)	(1,837)
Proceeds from the exercise of Common Stock options	16,557	14,777	2,755
Cash paid for the repurchase of Common Stock	(63,283)	(148,074)	(5,326)
Net cash used in financing activities	(108,593)	(139,266)	(31,564)
Foreign currency effect	(2,722)	(1,963)	25,357
Net increase (decrease) in cash, cash equivalents and restricted cash	13,328	(63,552)	(74,015)
Cash, cash equivalents and restricted cash at beginning of period	39,620	103,172	177,187
Cash, cash equivalents and restricted cash at end of period	52,948	39,620	103,172
Supplemental disclosure of cash flow information:
Cash paid for taxes	11,008	23,159	76,741
Cash paid for interest	$ 4,462	$ 5,027	$ 4,540

Overview

Overview	12 Months Ended
	Dec. 31, 2019
Organization Consolidation And Presentation Of Financial Statements [Abstract]
Overview	Note 1 — Overview Gentherm Incorporated is a global developer and marketer of innovative thermal management technologies for a broad range of heating and cooling and temperature control applications. Unless the context otherwise requires, the terms “Gentherm”, “Company”, “we”, “us” and “our” used herein refer to Gentherm Incorporated and its consolidated subsidiaries. Our products provide solutions for automotive passenger climate comfort and convenience, battery thermal management and cell connecting systems, as well as patient temperature management within the health care industry. Our automotive products can be found on the vehicles of nearly all major automotive manufacturers operating in North America, Europe and Asia. We operate in locations aligned with our major customers’ product strategies to provide locally enhanced design, integration and production capabilities. The Company is also developing a number of new technologies and products that will help enable improvements to existing products and to create new product applications for existing and new markets. On February 1, 2019, the Company completed the divestiture of its environmental test equipment business, Cincinnati Sub Zero industrial chamber business (“CSZ-IC”) and on October 1, 2019, the Company completed the divestiture of its remote power generation systems business, Gentherm Global Power Technologies (“GPT”). The Company’s consolidated financial statements herein include the results of CSZ-IC and GPT through their respective dates of divestiture.

Summary of Significant Accounti

Summary of Significant Accounting Policies	12 Months Ended
	Dec. 31, 2019
Accounting Policies [Abstract]
Summary of Significant Accounting Policies	Note 2 — Summary of Significant Accounting Policies Basis of Presentation The consolidated financial statements have been prepared in accordance with accounting principles generally accepted in the United States of America (“GAAP”). Certain prior period amounts have been reclassified to conform to current period presentation. Notably, $10,246 and $8,308 in customer relationship amortization was reclassified from product revenues to selling, general and administrative expenses for the fiscal years ended December 31, 2018 and 2017, respectively, and the results from asset disposals during 2017 were reclassified from other income to cost of sales for the year ended December 31, 2017. Principles of Consolidation The consolidated financial statements include the accounts of the Company, its wholly owned subsidiaries and those entities in which it has a controlling financial interest. Investments in affiliates in which Gentherm does not have control but does have the ability to exercise significant influence over operating and financial policies are accounted for under the equity method. When Gentherm does not have the ability to exercise significant influence (generally when ownership interest is less than 20%), investments in affiliates are measured at cost, less impairments, adjusted for observable price changes in orderly transactions for identical or similar investments of the same issuer. Use of Estimates The preparation of financial statements in conformity with GAAP requires the use of estimates and assumptions that affect amounts reported therein. Considerable judgment is involved in making these determinations and the use of different estimates or assumptions could result in significantly different results. Management believes its assumptions and estimates are reasonable and appropriate. However, actual results could differ from those reported herein. Segment Reporting The Company has two reportable segments: Automotive Industrial these businesses and division are presented together as one reporting segment because of their historical joint concentration on identifying new markets and product applications based on thermal management technologies . Revenue Recognition Revenue is recognized from agreements containing enforceable rights and obligations, when promised goods are delivered or services are completed. Taxes assessed by a governmental authority that are both imposed on and concurrent with a specific revenue-producing transaction, that are collected by the Company from a customer, are excluded from product revenues. Shipping and handling fees billed to customers are included in product revenues, while costs of shipping and handling are included in cost of sales. Automotive Revenues The Company provides production parts to its customers under long-term supply agreements (“LTAs”). The duration of an LTA is generally consistent with the life cycle of a vehicle; however, an LTA does not reach the level of a performance obligation until Gentherm receives either a purchase order and/or a materials release from the customer for a specific number of production parts at a specified price, at which point an enforceable contract exists. Revenue is recognized when control of the production parts has transferred to the customer according to the terms of the contract, which typically occurs when the parts are shipped or delivered to the customer’s premises. Revenue is measured as the amount of consideration we expect to receive in exchange for transferring production parts. Certain LTAs provide for annual price reductions over the production life of the vehicle. Agreements that are determined to provide customers with purchase option discounts that would not be received without entering into the contract are considered to contain a material right (for example, a discount given to a customer that is incremental to the range of discounts typically given to that class of customer). The material right represents a purchase option that provides the customer with the ability to purchase additional production parts at a set price in the future and is accounted for as a separate performance obligation. Under these circumstances, each transfer of production parts under the LTA requires allocation of the purchase price to the production part and the purchase option. As a practical alternative to estimating the standalone selling price of an option, the Company allocates transaction price to the purchase option by reference to the production part volumes expected to be ordered and the consideration expected to be received over the life of the vehicle program. The production part’s relative standalone selling price observed under the LTA is subtracted from the total amount of consideration expected to be received in exchange for transferring of parts under the current contract and the difference is allocated to the purchase option. Revenue from options containing a material right is recognized when the amounts billed by the customer for production parts transferred, under the LTA, is less than the standalone selling price of those production parts. Medical Revenues Revenues from our patient temperature management business unit are generated from the sale of products and equipment. Our medical products and equipment focus on body and blood temperature management. The Company sells medical products and equipment primarily through distributor and group purchasing organization agreements. These agreements allow member participants to the distributor or group purchasing organization to make purchases at discounted prices negotiated by the distributor or group purchasing organization. A rebate is incurred at the point in time a member participant purchases product covered under these types of agreements. Rebates are accounted for as variable consideration, using an expected value, probability weighted approach, based on the level of sales to the distributor and the time lag between the initial sale and the rebate claim in determining the transaction price of a contract. Revenue is recognized at the point in time the medical products or equipment is transferred to the customer. GPT and CSZ-IC Revenues Revenues from our divested businesses, GPT and CSZ-IC, were generated from the sale of products and services. GPT and CSZ-IC customers commonly entered into multiple-element agreements for the purchase of products and services. Installation services, for example, were separate and distinct performance obligations that were often included in contracts to purchase customized environmental test chambers. Depending on the application, delivery of an environmental test chamber or remote power generation system to the customer’s place of business could range from two weeks to nine months from commencement of the contract. Installation services, while reliant on the specifications and timing from the customer, rarely remained incomplete more than two months after delivery. Revenues allocated to environmental test chambers or remote power systems were based on the stand-alone selling price of the products themselves. Judgement was used to determine the degree to which early pay discounts and other credits were utilized in the calculation of standalone selling price, and only included to the extent it was probable that a significant reversal of any incremental revenue would not occur. Revenues were recognized at the point in time the chamber or power system was shipped to the customer. For contracts that also included a promise for installation, the portion of total transaction price allocated to the installation was recognized as revenue at the point in time the installation was complete. GPT and CSZ-IC often required milestone payments for contracts to provide environmental test chambers or remote power systems to customers. Milestone payments did not provide the Company with a right to payment for the work completed to date and did not represent the satisfaction of a performance obligation. Milestone payments were deferred and reported within unearned revenue until construction was complete and the unit had been delivered or was installed. If the environmental test chamber contract included a separate promise to provide installation services, any installation-related payments received from the customer were deferred until the point in time the installation was complete. The total amount of unearned revenue associated with environmental chamber and remote power system contracts, including environmental chamber contracts that included a separate obligation to provide installation, that existed as of December 31, 2018 was $5,296 and is classified within Liabilities held for sale on the consolidated balance sheet at December 31, 2018. See Note 4 to our consolidated financial statements for information about the assets and liabilities that was classified as held for sale. Assets Recognized from the Costs to Obtain a Contract with a Customer We recognize an asset for the incremental costs of obtaining a contract with a customer if the benefits of those costs are expected to be realized for a period greater than one year. Total capitalized costs to obtain a contract were $1,893 and $374 as of December 31, 2019 and 2018, respectively. These amounts are recorded in other current assets and are being amortized into product revenues over the expected production life of the program. During the year ended December 31, 2019, $1,006 was amortized into product revenues. During the year ended December 31, 2018, amounts amortized into product revenues was immaterial. Cash and Cash Equivalents and Restricted Cash The Company considers all highly liquid investments purchased with original maturities of less than 90 days to be cash equivalents. Cash balances in individual banks may exceed the federally insured limit by the Federal Deposit Insurance Corporation. The Company had cash and cash equivalents of $35,735 and $31,976 held in foreign jurisdictions as of December 31, 2019 and 2018, respectively. Restricted cash includes cash that is legally restricted as to use or withdrawal. Disclosures About Fair Value of Financial Instruments The carrying amounts of financial instruments comprising cash and cash equivalents, short-term investments and accounts receivable approximate fair value because of the short maturities of these instruments. The carrying amount of the Company’s U.S. Revolving Note approximates its fair value because interest charged on the loan balance is variable. See Note 15 for information about the techniques used to assess the fair value of financial assets and liabilities, including our fixed rate debt instruments. Concentration of Credit Risk Financial assets, which subject the Company to concentration of credit risk, consist primarily of cash equivalents, short-term investments and accounts receivable. Cash equivalents consist primarily of money market funds managed by major financial services companies. The credit risk for these cash equivalents is considered low. The Company does not require collateral from its customers. As of December 31, 2019, Lear, Adient and Magna comprised 21%, 21% and 7% respectively, of the Company’s accounts receivable balance. As of December 31, 2018, Lear, Adient, and Faurecia comprised 21%, 18% and 9% respectively, of the Company’s accounts receivable balance. These accounts are currently in good standing. Accounts Receivable Accounts receivable are stated at the invoiced amount, less allowance for doubtful accounts for estimated amounts not expected to be collected, and do not bear interest. We record an allowance for doubtful accounts once exposure to collection risk of an account receivable is specifically identified. We analyze the length of time an account receivable is outstanding, as well as a customer’s payment history and ability to pay to determine the need to record an allowance for doubtful accounts. We write-off accounts receivable when they become uncollectible. Inventory The Company’s inventory is measured at the lower of cost or net realizable value, with cost being determined using the first-in first-out basis. Raw materials, consumables and commodities are measured at cost of purchase and unfinished and finished goods are measured at cost of production, using the weighted average method. If the net realizable value expected on the reporting date is below cost, a write-down is recorded to adjust inventory to its net realizable value. We recognize a reserve for obsolete and slow-moving inventories based on estimates of future sales and an inventory item’s capacity to be repurposed for a different use. We consider the number of months supply on hand based on current planned requirements, uncommitted future projections and historical usage in estimating the inventory reserve. Property and Equipment Property and equipment, including additions and improvements, are recorded at cost less accumulated depreciation. Expenditures for repairs and maintenance are charged to expense as incurred. When property or equipment is retired or otherwise disposed of, the related cost and accumulated depreciation are removed from the accounts. Gains or losses from retirements and disposals are recorded as operating income or expense. Depreciation is computed using the straight-line method. The estimated useful lives of the Company’s property and equipment are as follows: Asset Category Useful Life Buildings and improvements 2 to 50 years Plant and equipment 1 to 20 years Production tooling 2 to 10 years Leasehold improvements Term of lease Information technology 1 to 10 years The Company recognized depreciation expense of $33,639, $36,270 and $32,224 for the years ended December 31, 2019, 2018 and 2017, respectively. Goodwill and Other Intangible Assets Goodwill and other intangible assets recorded in conjunction with business combinations are based on the Company’s estimate of fair value, as of the date of acquisition. Amortization is computed using the straight-line method. The fair value and corresponding useful lives for acquired intangible assets are listed below as follows: Asset Category Useful Life Customer relationships 6-15 years Technology 4-8 years Product development costs 1-15 years Tradenames Indefinite Our business strategy largely centers on designing products based upon internally developed and purchased technology. When possible and having value to the business strategy, we protect these technologies with patents. Our policy is to expense all costs associated with the development and issuance of new patents as incurred. Such costs are classified as research and development expenses in our consolidation statements of income. Patents purchased as part of a business combination are capitalized based on their fair values. Periodically, we review the recoverability and remaining lives of our capitalized patents, and if necessary, make adjustments to reported amounts, based upon unfavorable impacts from market conditions, the emergence of competitive technologies and changes in our projected business plans. Impairments of Long-Lived Assets, Other Intangible Assets and Goodwill Whenever events or changes in circumstances indicate that it is more likely than not that a long-lived asset’s fair value, other intangible asset’s fair value or a reporting unit’s fair value is less than it’s carrying amount, the Company then compares the fair value of the long-lived asset, other intangible asset or reporting unit to the related net book value. If the net book value of a long-lived asset, other intangible asset or reporting unit exceeds its fair value, an impairment loss is recognized for the amount by which the carrying amount of the asset exceeds its fair value. The fair value of a long-lived asset, other intangible asset or reporting unit is estimated by analyzing internal inputs (level 3) to calculate forward values and discounting those values to the present value. Goodwill is not amortized but is tested for impairment on at least an annual basis. Accrued Warranty Costs The Company accrues warranty obligations for products sold based on management estimates of future failure rates and current claim cost experience, with support from the sales, engineering, quality and legal functions. Using historical information available to the Company, including claims already filed by customers, the warranty accrual is adjusted quarterly to reflect management’s best estimate of future claims. Tooling The Company incurs costs related to tooling used in the manufacture of products sold to its customers. In some cases, the Company enters into contracts with its customers whereby the Company incurs the costs to design, develop and purchase tooling and is then reimbursed by the customer under a reimbursement contract. Tooling costs that will be reimbursed by customers are included in other current assets at the lower of accumulated cost or the customer reimbursable amount. As of December 31, 2019 and 2018, respectively, $5,347 and $6,628 of reimbursable tooling was capitalized within other current assets. Company-owned tooling is included in property and equipment and depreciated over its expected useful life, generally two to ten years. Management periodically evaluates the recoverability of tooling costs, based on estimated future cash flows, and makes provisions, where appropriate, for tooling costs that will not be recovered. Research and Development Expenses Research and development activities are expensed as incurred. The Company groups development and prototype costs and related reimbursements in research and development. The Company recognizes amounts due as reimbursements for expenses as these expenses are incurred. Leases The Company has operating leases for office, manufacturing and research and development facilities, as well as land leases for certain manufacturing facilities that are accounted for as operating leases. We also have operating leases for office equipment and automobiles. Excluding land leases, our leases have remaining lease terms ranging from less than 1 year to 7 years and may include options to extend the lease for an additional term equal to the original term of the lease. Land leases have remaining lease terms that range from 41 to 43 years and some which specify that the end of the lease term is at the discretion of the lessee. We do not have lease arrangements with related parties. The Company determines whether a contractual arrangement is or contains a lease at inception. Leases that are operating in nature are recognized in operating lease right-of-use assets, current lease liabilities and non-current lease liabilities on our consolidated balance sheets. While Gentherm is not currently party to any leases that qualify as financing leases, right-of-use assets and liabilities recognized from financing leases would be presented separately from the right-of-use assets and liabilities recognized from operating leases on our consolidated balance sheet. Lease liabilities are measured initially at the present value of the sum of the future minimum rental payments at the commencement date of the lease. Lease payments that will vary in the future due to changes in facts and circumstances are excluded from the calculation of rental payments, unless those variable payments are based on an index or rate. Rental payments are discounted using an incremental borrowing rate based on the Company’s credit rating, determined on a fully collateralized loan basis from information available at commencement date, and the duration of the lease term (the “reference rate”). Judgement is used to assess the importance of risk factor inputs during the computation of the Company’s credit rating. For significant leases at foreign subsidiaries denominated in U.S. Dollars, a risk premium associated with the borrower subsidiary’s country is added to the reference rate. For significant leases at foreign subsidiaries denominated in a foreign currency, the U.S. Dollar risk free rate with a duration similar to that of the lease term is subtracted from the reference rate and a corresponding foreign currency risk free rate with a duration similar to that of the lease term is added to the reference rate. Judgement is used to determine whether foreign subsidiary leases are significant. Operating lease right-of-use assets are measured at the amount of the lease liability, adjusted for prepaid or accrued lease payments, lease incentive received, and initial direct costs incurred, as applicable. Periods covered by an option to extend the lease are initially included in the measurement of an operating lease right-of-use asset and lease liability only when it is reasonably certain we will exercise the option. Gentherm’s lease agreements do not contain residual value guarantees or impose restrictions or covenants on the Company. For all classes of underlying assets, the Company accounts for leases that contain separate lease and non-lease components as containing a single lease component. The Company does not recognize lease right-of-use assets and lease liabilities from leases with an original lease term of 12 months or less and, instead, recognizes rent payments on a straight-line basis over the lease term in the Company’s consolidated statements of income. Income Taxes The Company records income tax expense using the liability method which specifies that deferred tax assets and liabilities be measured each year based on the difference between the financial statement and tax base of assets and liabilities at the applicable enacted tax rates. A valuation allowance is provided for deferred tax assets when management considers it more likely than not that the asset will not be realized. At December 31, 201 9 and 201 8 , a valuation allowance has been provided for certain deferred tax assets which the Company has concluded are more likely than not to not be realized. If future annual taxable income were to be significantly less than current and projected levels, there is a risk that certain of our deferred tax assets not already provided for by the valuation allowance would expire prior to utilization. The Company recognizes the financial statement benefit of a tax position only after determining that the relevant tax authority would more likely than not sustain the position following an audit. For tax positions meeting the more-likely-than-not threshold, the amount recognized in the financial statements is the largest benefit that has a greater than 50 percent likelihood of being realized upon ultimate settlement with the relevant tax authority. The Company recognizes interest and penalties related to income tax matters in income tax expense. Derivative Financial Instruments – Hedge Accounting The Company accounts for some of its derivative financial instruments as cash flow hedges as defined in Financial Accounting Standards Board (“FASB”) Accounting Standards Codification (“ASC”) Topic 815. For derivative contracts which can be classified as a cash flow hedge, the effective potion of the change in the fair value of the derivative is recorded to accumulated other comprehensive income in the consolidated balance sheets. When the underlying hedge transaction is realized, the gain or loss included in accumulated other comprehensive income is recorded in earnings in the consolidated statements of income on the same line as the gain or loss on the hedged item attributable to the hedged risk. Any ineffective portion of the gain or loss is recognized in the consolidated statements of income under foreign currency gain (loss) or revaluation of derivatives gain (loss). These hedging transactions and the respective correlations meet the requirements for hedge accounting. Earnings per Share Basic earnings per share is computed by dividing net income by the weighted average number of shares of Common Stock outstanding during the respective period. The Company’s diluted earnings per common share give effect to all potential shares of Common Stock outstanding during a period that are not anti-dilutive. In computing the number of diluted shares outstanding, the treasury stock method is used in order to arrive at a net number of shares created upon the conversion of Common Stock equivalents. Stock Based Compensation Share based payments that involve the issuance of Common Stock to employees, including grants of employee stock options, restricted stock, and time-based and performance-based restricted stock units, are recognized in the financial statements as compensation expense based upon the fair value on the date of grant. Performance-based restricted stock unit awards are measured based on either a target return on invested capital ratio (“ROIC”), as defined in the award agreement, for a specified fiscal year, or the Company’s common stock market price returning a target total shareholder return (“TSR”), as defined, during a specific three-year measurement period. Upon achievement of the performance measurement, performance-based restricted stock units vest over a three-year Share based payments that are satisfied only by the payment of cash, such as stock appreciation rights, are accounted for as liabilities. The liability is reported at market value of the vested portion of the underlying units. During each period, the change in the liability is recorded as compensation expense during periods when the liability increases or income during periods in which the liability decreases. Pension Plans The Company’s obligations and expenses for its pension plans are dependent on the Company’s selection of discount rate, expected long-term rate of return on plan assets and other assumptions used by actuaries to calculate these amounts. Assets and Liabilities Held for Sale The Company classifies assets and liabilities (disposal groups) to be sold as held for sale in the period in which all of the following criteria are met: management, having the authority to approve the action, commits to a plan to sell the disposal group; the disposal group is available for immediate sale in its present condition subject only to terms that are usual and customary for sales of such disposal groups; an active program to locate a buyer and other actions required to complete the plan to sell the disposal group have been initiated; the sale of the disposal group is probable, and transfer of the disposal group is expected to qualify as a completed sale within one year, except if events or circumstances beyond the Company’s control extend the period of time required to sell the disposal group beyond one year; the disposal group is being actively marketed for sale at a price that is reasonable in relation to its current fair value; and actions required to complete the plan indicate that it is unlikely that significant changes to the plan will be made or that the plan will be withdrawn. The Company initially measures a disposal group that is classified as held for sale at the lower of its carrying value or fair value less any costs to sell. Any loss resulting from this measurement is recognized in the period in which the held for sale criteria are met. Gains are not recognized on the sale of a disposal group until the date of sale. The Company assesses the fair value of a disposal group, less any costs to sell, each reporting period it remains classified as held for sale and reports any subsequent losses as an adjustment to the carrying value of the disposal group. The Company reports assets and liabilities of the disposal group in the line items assets held for sale and liabilities held for sale in the Consolidated Balance Sheet in the period the disposal group meets the criteria to be classified as held for sale. See Note 4 to our consolidated financial statements for information about the assets and liabilities classified as held for sale.

New Accounting Pronouncements

New Accounting Pronouncements	12 Months Ended
	Dec. 31, 2019
New Accounting Pronouncements And Changes In Accounting Principles [Abstract]
New Accounting Pronouncements	Note 3 — New Accounting Pronouncements Recently Adopted Accounting Pronouncements Leases In February 2016, the FASB issued ASU 2016-02, “Leases (Topic 842)” (as amended, “ASU 2016-02”). ASU 2016-02 requires lessees to recognize a lease liability and a right-of-use asset on the balance sheet for all leases, except for short-term leases with terms of twelve months or less. The lease liability represents the lessee’s obligation to make lease payments arising from a lease, and is measured as the present value of the lease payments. The right-of-use asset represents the lessee’s right to use a specified asset for the lease term, and is measured at the lease liability amount, adjusted for lease prepayment, lease incentives received and the lessee’s initial direct costs. Leases are to be classified as finance or operating leases, with classification affecting the pattern and classification of expense recognition in the statements of income (loss). The Company adopted ASU 2016-02 on January 1, 2019, by applying the modified retrospective method and recognized a cumulative-effect adjustment to the opening balance in retained earnings. Financial information has not been updated and disclosures under the new standard have not been provided to dates and periods before January 1, 2019 ASU 2016-02 did not have a presentation impact on the Company’s consolidated statements of income or cash flows for the year ended December 31, 2019 but did have a n impact on the consolidated balance sheet as of December 31, 2019. The cumulative effects of the changes made to the Company’s consolidated balance sheet as of January 1, 2019 for the adoption of ASU 2016-02 were as follows: Balance as of December 31, 2018 Adjustments due to adoption of ASU 2016-02 Balance as of January 1, 2019 Other current assets $ 54,363 $ (74 ) $ 54,289 Assets held for sale 69,699 4,127 73,826 Operating lease right-of-use assets — 13,019 13,019 Liabilities held for sale 13,062 4,136 17,198 Deferred income tax liabilities 1,177 114 1,291 Non-current lease liabilities — 12,561 12,561 Accumulated earnings 363,965 261 364,226 The Company elected the package of practical expedients provided in ASU 2016-02, which permits a lessee to not reassess under the new standard its prior conclusions about lease identification, lease classification and initial direct costs. Gentherm elected the use-of-hindsight to determine whether lease terms included periods covered by the lessee’s option to extend or terminate a lease, whether to purchase the underlying asset at the end of the lease agreement, and in assessing impairment of operating lease right-of-use assets. Finally, Gentherm elected to not assess whether existing or expired land easements that were not previously accounted for as leases are or contain a lease. Land easements previously accounted for as leases were not eligible for this practical expedient. Recently Issued Accounting Pronouncements Not Yet Adopted Expected Credit Losses In June 2016, the FASB issued ASU 2016-13, “Financial Instruments – Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments.” ASU 2016-13 requires the measurement of all expected credit losses for financial assets held at the reporting date based on historical experience, current conditions and reasonable and supportable forecasts. ASU 2016-13 is effective for annual and interim periods beginning after December 15, 2019. Early adoption of the amendments in this update is permitted. The Company is currently in the process of determining the impact the implementation of ASU 2016-13 will have on the consolidated financial statements and note disclosures. The adoption of this guidance is not expected to have a significant impact on the Company’s consolidated financial statements. Cloud Computing Arrangements That Are Service Contracts In August 2018, the FASB issued ASU 2018-15, “Intangibles – Goodwill and Other – Internal-Use Software (Subtopic 350-40): Customer’s Accounting for Implementation Costs Incurred in a Cloud Computing Arrangement That Is a Service Contract.” ASU 2018-15 requires implementation costs incurred by customers in cloud computing arrangements to be deferred and recognized over the term of the arrangement if those costs would be capitalized by the customer in a software licensing arrangement under the internal-use software guidance. ASU 2018-15 is effective for annual and interim periods beginning after December 15, 2019. Early adoption of the amendments in this update is permitted. We are currently in the process of determining the impact the implementation of ASU 2018-15 will have on the Company’s financial statements and note disclosures. The adoption of this guidance is not expected to have a significant impact on the Company’s consolidated financial statements. Retirement Benefits In August 2018, the FASB issued ASU 2018-14, “Compensation – Retirement Benefits – Defined Benefit Plans – General (Subtopic 715-20): Disclosure Framework – Changes to the Disclosure Requirements for Defined Benefit Plans.” ASU 2018-14 removes certain disclosure requirements, including (i) the amounts in accumulated other comprehensive income expected to be recognized as components of net periodic benefit cost over the next fiscal year, and (ii) the amount and timing of plan assets expected to be returned to the employer. ASU 2018-14 also adds new disclosure requirements, including (i) the weighted-average interest crediting rates for cash balance plans and other plans with promised interest crediting rates and (ii) an explanation of the reasons for significant gains and losses related to changes in the benefit obligation for the period. ASU 2018-14 is effective for annual periods ending after December 15, 2020. Early adoption of the amendments in this update is permitted. We are currently in the process of determining the impact the implementation of ASU 2018-14 will have on the Company’s financial statement note disclosures. The adoption of this guidance is not expected to have a significant impact on the Company’s consolidated financial statements. Fair Value Measurement In August 2018, the FASB issued ASU 2018-13, “Fair Value Measurement (Topic 820): Disclosure Framework – Changes to the Disclosure Requirements for Fair Value Measurement.” ASU 2018-13 removes certain disclosure requirements, including (i) the amount of and reasons for transfers between Level 1 and Level 2 of the fair value hierarchy, (ii) the policy for timing of transfer between levels, and (iii) the valuation processes for Level 3 fair value measurements. ASU 2018-13 also adds new disclosure requirements, including (i) the changes in unrealized gains and losses for the period included in other comprehensive income for recurring Level 3 fair value measurements held at the end of the reporting period and (ii) the range and weighted average of significant unobservable inputs used to develop Level 3 fair value measurements. ASU 2018-13 is effective for annual and interim periods beginning after December 15, 2019. Early adoption of disclosures that are removed is permitted, but adoption is delayed for the new additional disclosures until their effective date. We are currently in the process of determining the impact the implementation of ASU 2018-13 will have on the Company’s financial statement note disclosures. The adoption of this guidance is not expected to have a significant impact on the Company’s consolidated financial statements.

Acquisitions and Divestitures

Acquisitions and Divestitures	12 Months Ended
	Dec. 31, 2019
Business Combinations [Abstract]
Acquisitions and Divestitures	Note 4 – Acquisitions and Divestitures In June 2018, Gentherm announced a new strategic plan. An important element of the strategy was the elimination of investments in non-core areas, including GPT and CSZ-IC. The strategy also identified several product categories the Company exited in 2018, including furniture, aviation, battery management electronics, industrial battery packs, automotive thermoelectric generators and other non-core electronics. During the year ended December 31, 2018, Gentherm determined that GPT and CSZ-IC met the held for sale criteria and recognized $11,476 of asset impairment charges, consisting of $6,151 of goodwill impairment charges, $3,135 of other intangible asset impairment charges and $2,190 of impairment on assets held for sale. These impairment charges are reported within Industrial segment and are classified as Asset impairments and net loss on divestitures within the consolidated statements of income. Divestiture of CSZ-IC On February 1, 2019, the Company completed the sale of CSZ-IC and former Cincinnati Sub-Zero headquarters facility to Weiss Technik North America, Inc. for total cash proceeds of $47,500, including $2,500 of cash proceeds placed into an escrow account for a period of up to one year as partial security for the Company’s obligations under the sale agreement. In connection with the sale, Gentherm entered into an operating lease agreement for a portion of the office and manufacturing building space purchased by Weiss Technik North America, Inc. The Company recognized a $4,298 pre-tax gain on the sale of CSZ-IC for the year ended December 31, 2019 which is classified as Asset impairments and net loss on divestitures within the consolidated statements of income. Subsequent to December 31, 2019, claims were made against the cash proceeds held in the escrow account. The Company is not able to estimate the possible loss, if any, of amounts held in escrow in connection with this matter. Divestiture of GPT During 2019, the Company continued to assess the fair value of the GPT disposal group, less costs to sell, at each reporting period. As a result of these fair value measurements, the Company recognized additional impairment losses of $21,206 consisting of $ 4,486 of impairment of an equity investment that met the held for sale criteria during 2019 and $ 16,720 of impairment on assets held for sale . These impairment charges are classified as Asset impairments and net loss on divestitures within the consolidated statements of income. On October 1, 2019, the Company completed the sale of GPT for a nominal amount and recognized a $5,885 loss on sale for the year ended December 31, 2019, which included $3,995 related to the release of previously deferred foreign currency translation losses recorded in accumulated other comprehensive loss and $1,500 related to a loan to the buyer that was considered uncollectible. Assets and Liabilities Held for Sale as of December 31, 2018 – CSZ-IC and GPT The assets and liabilities of the disposal group classified as held for sale as of December 31, 2018 were as follows: Accounts receivable, less allowance of $96 $ 10,868 Inventory, net 13,925 Prepaid expenses and other assets 263 Property and equipment, net 29,459 Goodwill 6,844 Other intangible assets, net 6,326 Deferred income tax assets 4,204 Other non-current assets — Impairment loss (2,190 ) Total assets for sale 69,699 Accounts payable 2,614 Accrued liabilities 10,448 Total liabilities for sale $ 13,062 Acquisition of Stihler Electronic GmbH On April 1, 2019, Gentherm acquired Stihler Electronic GmbH (“Stihler”), a leading developer and manufacturer of patient and blood temperature management systems, for a purchase price of $15,476, net of cash acquired and including $653 of contingent consideration to be paid upon achievement of a milestone that must be completed by September 2020. In addition, the purchase agreement includes a contingent payment of $653 to be paid if the selling shareholder remains employed by Stihler through December 2020. This amount is being recognized as a component of selling, general and administrative expenses ratably over the service period. The results of operations of Stihler are reported within the Company’s Industrial segment from the date of acquisition. During the year ended December 31, 2019, the Company incurred acquisition-related costs of approximately $324. These amounts were recorded as incurred, within the Company's consolidated statements of income. The acquisition was accounted for as a business combination. The purchase price and related allocation to the acquired net assets of Stihler, based on their estimated fair values as of the acquisition date, are shown below: Purchase price, cash consideration, net of cash acquired $ 14,823 Purchase price, fair value of contingent consideration 653 Total purchase price, net of cash acquired 15,476 Accounts receivable 883 Inventory 1,698 Prepaid expenses and other assets 241 Operating lease right-of-use assets 263 Property and equipment 260 Other intangible assets 4,380 Goodwill 9,816 Assumed liabilities (2,065 ) Net assets acquired $ 15,476 Other intangible assets primarily include amounts recognized for the fair value of customer-related intangible assets, which will be amortized over their estimated useful lives of approximately 9 years. The estimated fair value of these assets was based on third-party valuations and management’s estimates, generally utilizing an income approach. Goodwill recognized in this transaction is primarily attributable to intangible assets that do not qualify for separate recognition. It is estimated that $2,524 of the goodwill recognized will be deductible for income tax purposes. The pro forma effect of the Stihler acquisition does not materially impact the Company’s reported results for any period presented, and as a result no pro forma financial statements are presented. Acquisition of Etratech On November 1, 2017, the Company acquired substantially all of the assets and assumed substantially all of the operating liabilities of Etratech Inc., an Ontario corporation and all of the outstanding shares of Etratech Hong Kong, an entity organized under the laws of Hong Kong, in an all-cash transaction for a purchase price of $65,009, net of cash acquired of $670. Etratech manufactures advanced electronic controls and control systems for the automotive, RV and marine, security, medical and other industries. Results of operations for Etratech are reported within the Company’s Automotive segment from the date of acquisition. Etratech contributed $8,398 in product revenues and a net loss of $510 for the year ended December 31, 2017. Supplemental Pro Forma Information The unaudited pro forma combined historical results including the amounts of Etratech revenue and earnings that would have been included in the Company’s consolidated statements of income had the acquisition date been January 1, 2017 is as follows: Year Ended December 31, 2017 Product revenues $ 1,032,273 Net income $ 35,911 Basic earnings per share $ 0.98 Diluted earnings per share $ 0.98 This pro forma information is not indicative of future operating results.

Restructuring

Restructuring	12 Months Ended
	Dec. 31, 2019
Restructuring And Related Activities [Abstract]
Restructuring	Note 5 — Manufacturing Footprint Rationalization On September 23, 2019, the Company committed to a restructuring plan to improve the Company’s manufacturing productivity and rationalize its footprint. Under this plan, the Company will relocate and consolidate certain existing automotive manufacturing and, as a result, certain other activities, overall reducing the number of plants by two. During the year ended December 31, 2019, the Company recognized expense of $4,863 for employee separation costs that will be paid pursuant to the terms of statutory requirements of the affected locations. Additionally, the Company recognized $2,087 of accelerated depreciation and fixed asset impairment. The Company expects to incur total costs of between $20,000 and $24,000, of which between $17,000 and $21,000 are expected to be cash expenditures. The total expected costs include employee separation costs of between $9,000 and $11,000, capital expenditures of between $4,500 and $5,500 and non-cash expenses for accelerated depreciation and impairment of fixed assets of $3,000. The Company also expects to incur other transition costs including recruiting, relocation, and machinery and equipment move and set up costs of between $3,500 and $4,500. The actions under this plan are expected to be substantially completed by the end of 2021. The actual timing, costs and savings of the Plan may differ materially from the Company’s current expectations and estimates. Other Restructuring Activities As part of the Company’s continued efforts to optimize its cost structure, the Company has undertaken several discrete restructuring actions. During the years ended December 31, 2019 and 2018, the Company recognized $2,942 and $6,598 of employee separation costs, respectively, and $1,360 and $2,869 of other related costs, respectively. These restructuring expenses were primarily associated with restructuring actions focused on the rotation of our manufacturing footprint to lower cost locations and the reduction of global overhead costs. These discrete restructuring actions are expected to approximate the total cumulative costs for those actions. The Company will continue to explore opportunities to improve its future profitability and competitiveness. These actions may result in the recognition of additional restructuring charges that could be material. Advanced Research and Development Rationalization and Site Consolidation In June 2018, Gentherm completed the sale of its battery management systems division located in Irvine, California. A loss on the sale of $1,107 was recognized in restructuring expenses during the year ended December 31, 2018. An additional asset impairment loss of $425 was recognized during the year ended December 31, 2019. During the year ended December 31, 2018, Gentherm recognized employee separation costs of $1,094, and $643 of other related costs associated with the closure of two leased facilities located in Azusa, California. The Company also recognized $1,400 in restructuring expenses for the year ended for the disposal of long-lived assets controlled and used in Azusa, California. The Company has recorded approximately $4,669 of restructuring expenses since inception of this program and it is considered complete. GPT and CSZ-IC During 2018, Gentherm launched a program to actively market GPT and CSZ-IC. Costs associated with the divestiture process were classified as restructuring. During the year ended December 31, 2019 and 2018 The Company has recorded approximately $2,303 of restructuring expenses since inception of this program and it is considered substantially complete. Restructuring Expenses By Reporting Segment Restructuring expense by reporting segment for the years ended December 31, 2019, 2018 and 2017 was as follows: Year Ended December 31, 2019 2018 2017 Automotive $ 9,353 $ 5,548 $ — Industrial 1,838 5,607 — Reconciling items 1,728 3,617 — Total $ 12,919 $ 14,772 $ — Restructuring Liability The following table summarizes restructuring activity for all restructuring initiatives for the years ended December 31, 2019 and 2018: Employee Separation Costs Accelerated Depreciation and Asset Impairment Charges Other Related Costs Total Balance at December 31, 2017 $ — $ — $ — $ — Additions, charged to restructuring expenses 8,449 2,507 3,816 14,772 Cash payments (6,346 ) — (3,348 ) (9,694 ) Non-cash utilization — (2,507 ) — (2,507 ) Reclassification to lease liability — — — — Currency translation (24 ) — — (24 ) Balance at December 31, 2018 2,079 — 468 2,547 Additions, charged to restructuring expenses 8,056 2,512 2,351 12,919 Cash payments (4,118 ) — (2,636 ) (6,754 ) Non-cash utilization — (2,512 ) — (2,512 ) Reclassification to lease liability — — (112 ) (112 ) Currency translation (23 ) — — (23 ) Balance at December 31, 2019 $ 5,994 $ — $ 71 $ 6,065

Earnings Per Share

Earnings Per Share	12 Months Ended
	Dec. 31, 2019
Earnings Per Share [Abstract]
Earnings per Share	Note 6 — The Company’s diluted earnings per share give effect to all potential common shares outstanding during a period that do not have an anti-dilutive impact to the calculation. The following summarizes the shares included in the dilutive shares as disclosed in the consolidated statements of income: Year Ended December 31, 2019 2018 2017 Weighted average number of shares for calculation of basic EPS – Common Stock 33,120,076 35,920,782 36,720,749 Stock options, restricted stock awards and restricted stock units under equity incentive plans 177,513 256,362 92,970 Weighted average number of shares for calculation of diluted EPS – Common Stock 33,297,589 36,177,144 36,813,719 The accompanying table represents Common Stock issuable upon the exercise of certain stock options and that have been excluded from the diluted earnings calculation because the effect of their inclusion would be anti-dilutive. Year Ended December 31, 2019 2018 2017 Stock options outstanding for equity incentive plans 214,000 898,250 2,055,784 See Note 18 for information about the Company’s different equity incentive plans.

Segment Reporting

Segment Reporting	12 Months Ended
	Dec. 31, 2019
Segment Reporting [Abstract]
Segment Reporting	Note 7 — Segment information is used by management for making operating decisions for the Company. Management evaluates the performance of the Company’s segments based primarily on operating income or loss. The Company’s reportable segments are as follows: • Automotive — this segment represents the design, development, manufacturing and sales of automotive climate comfort systems, specialized automotive cable systems, battery thermal management, and automotive electronic systems. • Industrial — this segment represents the combined results from our Medical business, GPT (through October 1, 2019), CSZ-IC (through February 1, 2019) and Gentherm’s advanced research and development division. The operating results from these businesses and division are presented together as one reporting segment because of their historical joint concentration on identifying new markets and product applications based on thermal management technologies. • Reconciling Items — include corporate selling, general and administrative costs and acquisition transaction costs. The tables below present segment information about the reported product revenues and operating income of the Company for years ended December 31, 2019, 2018 and 2017. With the exception of goodwill, asset information by segment is not reported since the Company does not manage assets at a segment level. Automotive Industrial Reconciling Items Consolidated Total 2019: Product revenues $ 920,225 $ 51,459 $ — $ 971,684 Depreciation and amortization 40,765 1,779 1,702 44,246 Operating income (loss) 149,514 (14,043 ) (51,211 ) 84,260 2018: Product revenues $ 957,824 $ 90,681 $ — $ 1,048,505 Depreciation and amortization 43,621 4,384 2,633 50,638 Operating income (loss) 152,051 (22,530 ) (56,733 ) 72,788 2017: Product revenues $ 886,600 $ 107,391 $ — $ 993,991 Depreciation and amortization 36,801 5,399 2,772 44,972 Operating income (loss) 166,378 (14,751 ) (54,529 ) 97,098 Automotive and Industrial segment product revenues by product category for each of the years ended December 31, 2019, 2018 and 2017 are as follows: 2019 2018 2017 Climate Control Seat (CCS) $ 359,355 $ 373,945 $ 387,961 Seat Heaters 284,174 305,337 307,308 Automotive Cables 88,031 98,931 92,092 Steering Wheel Heaters 65,426 69,845 62,125 Electronics 47,542 56,783 8,816 Battery Thermal Management (BTM) 41,498 28,472 10,046 Other Automotive 34,199 24,511 18,252 Subtotal Automotive 920,225 957,824 886,600 Medical 36,860 30,108 30,375 GPT 11,181 19,520 32,282 CSZ-IC 3,418 41,053 44,734 Subtotal Industrial 51,459 90,681 107,391 Total Company $ 971,684 $ 1,048,505 $ 993,991 Revenue (based on shipment destination) by geographic area for each of the years ended December 31, 2019, 2018 and 2017 is as follows: 2019 2018 2017 United States $ 440,316 $ 488,926 $ 454,669 Germany 81,315 88,366 71,768 Japan 76,197 62,633 57,467 China 71,461 93,628 93,645 South Korea 63,339 58,717 64,715 Czech Republic 38,888 42,665 38,828 Canada 37,804 44,500 46,368 United Kingdom 31,357 37,533 36,033 Romania 26,213 22,435 18,050 Other 104,794 109,102 112,448 Total Non-U.S. 531,368 559,579 539,322 Total Company $ 971,684 $ 1,048,505 $ 993,991 The table below lists the percentage of total product revenues generated from sales to customers which contributed 10% or more to the Company’s total consolidated product revenue: 2019 2018 2017 Lear 16 % 17 % 20 % Adient 15 % 16 % 18 % Property and equipment, net, for each of the geographic areas in which the Company operates is as follows: December 31, 2019 2018 Property and equipment, net Macedonia $ 38,989 $ 39,664 China 23,721 26,108 Vietnam 21,452 20,768 United States 21,280 24,122 Mexico 19,982 26,119 Ukraine 11,727 10,670 Germany 10,515 9,874 Hungary 6,803 7,546 Other 6,136 6,509 Total $ 160,605 $ 171,380

Revenue Recognition

Revenue Recognition	12 Months Ended
	Dec. 31, 2019
Revenue Recognition And Deferred Revenue [Abstract]
Revenue Recognition	Note 8 –Revenue Recognition The principal activity from which the Company generates its revenue is the manufacturing of production parts for automotive OEMs and automotive suppliers, as well as the sale of medical products and equipment primarily through distributor and group purchasing organization agreements. Contract Balances We record a receivable when revenue is recognized at the time of invoicing and unearned revenue when revenue is recognized subsequent to invoicing. For contracts where control of the goods or service is transferred to the customer over time, or whose terms required the customer to make milestone payments throughout the fulfillment period, the timing of revenue recognition is likely to differ from the timing of invoicing to customers. Most of Gentherm’s unearned revenue pertains to LTAs containing a material right. In the early periods of an LTA containing a material right, when payments collected from the customer are greater than the standalone selling price of the production parts, revenue associated with the material right is deferred. In future periods, when amounts collected from customers as payment is less than the standalone selling price of the production parts delivered, the deferred revenue is reversed into revenue. For LTAs containing a material right and, thus, the timing of revenue recognition is likely to differ from the timing of invoicing to customer, the aggregate amount of transaction price allocated to material rights that remained unsatisfied under LTAs as of December 31, 2019 was $579. We expect to recognize into revenue, 69% of this balance in 2020, and the remaining 11%, 11% and 9% in 2021, 2022 Unearned revenue by segment was as follows: December 31, 2019 December 31, 2018 Automotive $ 579 $ 1,597 Industrial — — Total $ 579 $ 1,597 Changes in unearned revenue for the year ended December 31, 2019 were as follows: Balance, beginning of period $ 1,597 Additions to unearned revenue 234 Reclassified to revenue (1,238 ) Currency impacts (14 ) Balance, end of period $ 579 Revenue allocated to remaining performance obligations represent contracted revenue that has not yet been recognized, which includes unearned revenue and amounts that will be invoiced and recognized as revenue in future periods.

Income Taxes

Income Taxes	12 Months Ended
	Dec. 31, 2019
Income Tax Disclosure [Abstract]
Income Taxes	Note 9 — U.S. Tax Reform The Tax Cuts and Jobs Act (“Tax Act”) was enacted on December 22, 2017. The Tax Act reduced the U.S. federal corporate income tax rate from 35% to 21% beginning in 2018, required companies to pay a one-time transition tax on all offshore earnings that were previously tax deferred and created new taxes on certain foreign sourced earnings. In March 2018, the FASB issued ASU 2018-05, “Income Taxes – Amendments to SEC Paragraphs Pursuant to SEC Staff Accounting Bulletin No. 118”. The guidance provided for a provisional one-year measurement period for entities to finalize their accounting for certain tax effects related to the Tax Act. As of December 31, 2017, the Company made a provisional estimate of $20,153 for the effects on our existing deferred tax balances, the one-time transition tax and our indefinite reinvestment assertion regarding foreign subsidiary earnings in accordance with the guidance. As of December 31, 2018, the Company evaluated the provisional amounts initially recorded for the year ended December 31, 2017 and recorded adjustments based on updates to the Company’s assumptions and the application of additional interpretative guidance as issued during 2018. The adjustments are primarily a result of refining the net deferred tax asset position with the completion of our 2017 U.S. income tax return and changing tax accounting methods that affected the timing of certain US tax deductions. These adjustments resulted in (i) a decrease in our existing deferred tax asset balances which resulted in an income tax expense of $4,950 and (ii) a net increase to the one-time transition tax which resulted in an income tax expense of $24,625. No adjustment was required to the $9,578 tax benefit included in the provision for income taxes as of December 31, 2017 to offset the one-time transition tax related to the previous deferred tax liability that existed for the undistributed foreign earnings that were not permanently reinvested. As of December 31, 2018, the total income tax expense was $19,997 for the year ended December 31, 2017, as compared to the provisional estimate of $20,153. The Company also analyzed the impact of several new provisions of the Tax Act that became effective as of January 1, 2018, such as global intangible low-taxed income (“GILTI”) provision, foreign-derived intangible income (“FDII”) deduction, a new minimum tax related to payment to foreign subsidiaries and affiliates known as base erosion anti-abuse tax (“BEAT”), interest expense limitations under Internal Revenue Code (“IRC”) section 163(j), executive compensation limitations under IRC section 162(m) and various other provisions. The GILTI provision imposes a tax on certain earnings of foreign subsidiaries. U.S. GAAP allows companies to make an accounting policy election to either recognize deferred taxes for temporary basis differences expected to reverse as GILTI in future years or to provide for the tax expense related to GILTI in the year the tax is incurred. We have elected to account for GILTI in the year the tax is incurred. The deferred tax assets and deferred tax liabilities and related valuation allowance were comprised of the following: December 31, 2019 2018 Deferred tax assets: Net operating losses $ 17,881 $ 7,666 Intangible assets 33,609 42,853 Research and development credits 9,752 8,211 Depreciation 7,223 6,321 Valuation reserves and accrued liabilities 7,196 4,849 Foreign tax credit 262 376 Stock compensation 3,485 4,128 Inventory 1,284 1,069 Patents 134 150 Defined benefit obligation 2,027 1,796 Other credits 11,491 3,701 Other $ 114 89 Total deferred tax asset 94,458 81,209 Valuation allowance (28,763 ) (9,977 ) Deferred tax liabilities: Unrealized foreign currency exchange gains (674 ) (554 ) Undistributed profits of subsidiary (4,629 ) (4,352 ) Property and equipment (3,366 ) (2,896 ) Other (733 ) (583 ) Total deferred tax liability (9,402 ) (8,385 ) Net deferred tax asset $ 56,293 $ 62,847 Reconciliations between the statutory Federal income tax rate and the effective rate of income tax expense for each of the three years in the period ended December 31, 2019 are as follows: Year Ended December 31, 2019 2018 2017 Statutory Federal income tax rate 21.0 % 21.0 % 34.0 % Increase (decrease) resulting from: Change in Valuation Allowance 30.7 % (6.6 )% 10.6 % Effect of different tax rates of foreign jurisdictions (24.8 )% (6.6 )% (20.8 )% US Tax Reform Items 4.3 % 10.8 % 29.1 % Research and Development Credits (2.3 )% (2.5 )% (4.6 )% Non-deductible expenses 2.1 % 3.4 % 2.4 % Foreign, state and local tax, net of Federal benefit 1.7 % 1.8 % 0.8 % Tax effects of intercompany transfers 1.5 % 0.8 % (5.0 )% Undistributed profit of subsidiaries 1.2 % 1.2 % 5.8 % Other 1.2 % 4.6 % (1.0 )% Stock Compensation Expense 0.0 % 0.0 % (2.2 )% Effective Rate 36.6 % 27.9 % 49.1 % The Company has Net Operating Loss (“NOL”) carryforwards as follows: Jurisdiction Amount as of December 31, 2019 Years of Expiration U.S. Federal and state income tax $ 85,828 2020-2039 Foreign $ 13,153 2020-2024 Foreign $ 109,665 Never A portion of the U.S. Federal NOLs was incurred prior to the June 8, 1999 Preferred Financing, which qualified as a change in ownership under Section 382 of the Internal Revenue Code (“IRC”). Due to this change in ownership, the NOL accumulated prior to the change in control can only be utilized against current earnings up to a maximum annual limitation of approximately $591. As a result of the annual limitation, approximately $19,349 in NOLs generated prior to the change in control have already expired without being utilized. No further NOL is available to be utilized in future periods. We have incurred NOLs in various states associated with the benefits of the state dividends received reduction along with the foreign royalty exclusion. The state net operating loss carryforwards expire at various dates from 2020 to 2039. Management has concluded that it is more likely than not that a majority of these NOLs will not be utilized, and thus has not recognized the benefit of these NOLs. At December 31, 2019, certain non-U.S. subsidiaries have net operating loss carryforwards totaling $122,818. This amount includes $13,153 in NOLs that expire at various dates from 2020 through 2024 and the remaining $109,665 have no expiration date. The Company has a valuation allowance recorded against $110,012 of the total non-U.S. subsidiaries’ net operating loss carryforwards as of December 31, 2019. The earnings before income taxes and our tax provision are comprised of the following: Year Ended December 31, 2019 2018 2017 Income (loss) before income taxes: Domestic $ 74,531 $ 10,092 $ 1,258 Foreign (15,380 ) 48,027 67,997 Total income before income taxes $ 59,151 $ 58,119 $ 69,255 Year Ended December 31, 2019 2018 2017 Current income tax expense (benefit): Federal $ 262 $ 340 $ 4,140 State and local 94 (71 ) 150 Foreign 17,672 9,224 24,672 Total current income tax expense 18,028 9,493 28,962 Deferred income tax expense (benefit): Federal (2,490 ) (1,422 ) 15,207 State and local (1 ) 20 2,308 Foreign 6,108 8,129 (12,449 ) Total deferred income tax expense 3,617 6,727 5,066 Total tax expense $ 21,645 $ 16,220 $ 34,028 As of December 31, 2019, deferred income taxes have not been provided on the undistributed earnings of the Company’s foreign subsidiaries since these earnings will not be taxable upon repatriation to the United States. These earnings will be primarily treated as previously taxed income from either the one-time transition tax or GILTI, or they will be offset with a 100% dividend received deduction. However, the Company continues to provide a deferred tax liability for foreign withholding tax that will be incurred with respect to the undistributed foreign earnings that are not permanently reinvested. The Company is subject to taxation in the United States and various state and foreign jurisdictions. As of December 31, 2019, the Company is no longer subject to U.S. Federal examinations by tax authorities for tax years before 2015 and is no longer subject to foreign examinations by tax authorities for tax years before 2012. During 2015, to entice the Company to construct a new facility in Macedonia, the government of Macedonia granted the Company a tax holiday that released the Company from the obligation to pay corporate income taxes for a ten year period, subject to certain limitations. The amount of corporate income tax savings realized by the Company as a result of this tax holiday during 2019 and 2018, respectively, was zero as a result of operating losses generated during previous periods. The aggregate dollar effect and per share effect of the corporate income tax holiday during 2019 and 2018 was, therefore, immaterial. At December 31, 2019, 2018 and 2017, the Company had total unrecognized tax benefits of $3,795, $2,819 and $3,812, respectively, all of which, if recognized, would affect the effective income tax rates. The reconciliation of the beginning and ending amount of unrecognized tax benefits is as follows: Year Ended December 31, 2019 2018 2017 Balance at beginning of year $ 2,819 $ 3,812 $ 3,877 Additions based on tax position related to current year 661 221 1,758 Additions based on tax position related to prior year 352 423 (105 ) Reductions from settlements and statute of limitation expiration — (1,469 ) (2,247 ) Effect of foreign currency translation (37 ) (168 ) 529 Balance at end of year $ 3,795 $ 2,819 $ 3,812 The Company classifies income tax-related penalties and net interest as income tax expense. In the years ended December 31, 2019, 2018 and 2017 income tax related interest and penalties were insignificant. It is reasonably possible that audit settlements, the conclusions of current examinations or the expiration of the statute of limitations in several jurisdictions could impact the Company’s unrecognized tax benefits. If recognized, all of the Company’s gross unrecognized tax benefits would affect the Company’s effective tax rate.

Pension and Other Post Retireme

Pension and Other Post Retirement Benefit Plans	12 Months Ended
	Dec. 31, 2019
Compensation And Retirement Disclosure [Abstract]
Pension and Other Post Retirement Benefit Plans	Note 10 — The Company maintains a U.S. defined benefit pension plan covering its former Chief Executive Officer (“U.S. Plan”) and a German defined benefit pension plan covering certain retired executive employees of the Company’s wholly owned subsidiary, Gentherm GmbH (“German Plan”). The components of net periodic benefit cost for the Company’s defined benefit plans for the years ended December 31, 2019 , 2018 and 201 7 were as follows: U.S. Plan German Plan Year Ended December 31, Year Ended December 31, 2019 2018 2017 2019 2018 2017 Net periodic benefit cost: Service cost $ — $ — $ 101 $ — $ — $ — Interest cost 127 114 111 147 147 130 Expected return on plan assets — — — (126 ) (130 ) (121 ) Amortization of prior service cost and actuarial loss — — 509 72 73 78 Net periodic benefit cost $ 127 $ 114 $ 721 $ 93 $ 90 $ 87 Assumptions: Discount rate 3.65 % 2.95 % 3.25 % 1.06 % 2.04 % 1.93 % Long-term return on assets N/A N/A N/A 3.10 % 3.40 % 3.40 % A reconciliation of the change in benefit obligation and the change in plan assets for the years ended December 31, 2019 and 2018 is as follows: U.S. Plan German Plan As of December 31, As of December 31, 2019 2018 2019 2018 Change in projected benefit obligation: Balance at beginning of year $ 3,832 $ 4,218 $ 7,529 $ 7,927 Interest cost 127 114 147 147 Paid pension distributions (342 ) (342 ) (285 ) (292 ) Actuarial (gains) losses 254 (158 ) 1,116 114 Exchange rate impact — — (154 ) (367 ) Balance at end of year $ 3,871 $ 3,832 $ 8,353 $ 7,529 Change in plan assets: Balance at beginning of year $ — $ — 3,808 3,891 Actual return on plan assets — — 126 130 Contributions — — 284 292 Paid pension distributions — — (284 ) (292 ) Actuarial losses — — (30 ) (30 ) Exchange rate impact — — (79 ) (183 ) Balance at end of year $ — $ — $ 3,825 $ 3,808 Funded Status (underfunded)/overfunded $ (3,871 ) $ (3,832 ) $ (4,528 ) $ (3,721 ) Balance sheet classification: Other current liabilities (342 ) (342 ) — — Pension benefit obligation (3,529 ) (3,490 ) (4,528 ) (3,721 ) Accumulated other comprehensive loss (pre-tax): Actuarial losses 476 222 3,398 2,372 Assumptions: Discount rate 2.40 % 3.65 % 1.06 % 2.04 % Pre-tax amounts included in AOCI that are expected to be recognized in net periodic benefit cost during the year ended December 31, 2020 are as follows: U.S Plan German Plan Actuarial losses $ 7 $ 122 The accumulated benefit obligations were as follows: U.S. Plan German Plan As of December 31, As of December 31, 2019 2018 2019 2018 Accumulated benefit obligation $ 3,871 $ 3,832 $ 8,529 $ 7,894 Interest costs are recognized in selling, general and administrative expenses in the Company’s consolidated statements of income and actuarial gains and losses are included the Company’s consolidated balance sheet as part of accumulated other comprehensive loss within shareholders’ equity. Actuarial gains or losses are amortized to selling, general and administrative expense in the Company’s consolidated statements of income based on the average future life of the Plan using the corridor method. Prior service cost is included in selling, general and administrative expenses in the Company’s consolidated statements of income. Plan assets – German Plan Plan assets are comprised of Gentherm GmbH’s pension insurance policies and are pledged to the beneficiaries of the German Plan. A market valuation technique, based on observable underlying insurance charges, is used to determine the fair value of the pension plan assets (Level 2). The expected return on plan assets assumption used to calculate Gentherm GmbH’s pension benefit obligation was determined using actual returns realized on plan assets in the prior year. Other assets Although the U.S. Plan is not funded, the Company has established a separate trust having the sole purpose of paying benefits under the U.S. Plan. The only asset of the trust is a corporate-owned life insurance policy (“COLI”). The COLI is valued at fair value using quoted prices listed in active markets (Level 1). The policy value of the COLI was $2,592 and $2,148 as of December 31, 2019 and 2018, respectively, and is included in other non-current assets in the Company’s consolidated balance sheets. Contributions We do not expect contributions to be paid to the U.S. Plan or the German Plan during the next fiscal year. The schedule of future expected pension payments is as follows: Projected Pension Benefit Payments Year U.S Plan German Plan 2020 $ 342 $ 289 2021 342 287 2022 342 283 2023 342 293 2024 342 287 2025-2029 1,710 2,839 Total $ 3,420 $ 4,278 Defined contribution plans The Company also sponsors defined contribution plans for eligible employees. On a discretionary basis, the Company matches a portion of the employee contributions and or makes additional discretionary contributions. Gentherm recognized costs of $1,384, $1,471 and $1,396 related to contributions to its defined contribution plans during the years ended December 31, 2019, 2018 and 2017, respectively.

Goodwill and Other Intangibles

Goodwill and Other Intangibles	12 Months Ended
	Dec. 31, 2019
Goodwill And Intangible Assets Disclosure [Abstract]
Goodwill and Other Intangibles	Note 11 — Goodwill and Other Intangibles Goodwill Changes in the carrying amount of goodwill, by reportable segment, for the years ended December 31, 2019 and 2018 were as follows: Automotive Industrial Total December 31, 2017 $ 38,912 $ 30,773 $ 69,685 Reclassifications to assets held for sale — (6,844 ) (6,844 ) Impairment of goodwill (a) — (6,151 ) (6,151 ) Exchange rate impact (1,379 ) — (1,379 ) December 31, 2018 $ 37,533 $ 17,778 $ 55,311 Stihler acquisition — 9,816 9,816 Exchange rate impact (595 ) 40 (555 ) December 31, 2019 $ 36,938 $ 27,634 $ 64,572 a) See Note 4, “Acquisitions and Divestitures” for a description of the impairment of goodwill. Other Intangible Assets Other intangible assets and accumulated amortization balances as of December 31, 2019 and 2018 were as follows: Gross Carrying Value Accumulated Amortization Net Carrying Value Definite-lived: Customer relationships $ 89,208 $ (50,687 ) $ 38,521 Technology 25,106 (19,866 ) 5,240 Product development costs 19,911 (18,559 ) 1,352 Indefinite-lived: Tradenames 4,670 — 4,670 Balance as of December 31, 2019 $ 138,895 $ (89,112 ) $ 49,783 Definite-lived: Customer relationships $ 87,316 $ (44,269 ) $ 43,047 Technology 25,110 (18,616 ) 6,494 Product development costs 20,487 (18,313 ) 2,174 Indefinite-lived: Tradenames 4,670 — 4,670 Balance as of December 31, 2018 $ 137,583 $ (81,198 ) $ 56,385 In connection with the acquisition of Stihler, the Company recorded intangible assets including customer relationships and technology of $3,420 and $538, respectively. These definite-lived assets are being amortized using the straight-line method over their estimated useful lives of approximately 9 years and 7 years, respectively. A total of $10,068, $14,043 and $12,425 in other intangible assets, including capitalized patent costs, were amortized in 2019, 2018 and 2017, respectively. An estimate of other intangible asset amortization by year, is as follows: 2020 $ 8,644 2021 7,700 2022 7,225 2023 4,082 2024 3,033 Impairment Charges During 2018, Gentherm determined GPT and CSZ-IC met the held for sale criteria, described above, and recorded an impairment loss on assets held for sale, goodwill and other intangible assets of $2,190, $6,151 and $3,135, respectively.

Details of Certain Financial St

Details of Certain Financial Statement Components	12 Months Ended
	Dec. 31, 2019
Financial Statement Components [Abstract]
Details of Certain Financial Statement Components	Note 12 — Details of Certain Financial Statement Components December 31, 2019 2018 Inventory: Raw materials, net of reserve $ 61,323 $ 61,679 Work in process, net of reserve 7,444 5,939 Finished goods, net of reserve 49,712 44,917 Total inventory, net $ 118,479 $ 112,535 Other current assets: Income tax and other tax receivables $ 17,057 $ 28,887 Notes receivable 9,963 9,837 Prepaid expenses 7,022 6,962 Billable tooling 5,194 6,475 Short-term derivative financial instruments 1,242 92 Other 2,248 2,110 Total other current assets $ 42,726 $ 54,363 Property and equipment: Buildings and improvements $ 90,675 $ 88,950 Plant and equipment 137,813 125,487 Information technology 27,697 26,381 Production tooling 19,906 15,526 Leasehold improvements 11,116 10,320 Construction in progress $ 2,856 $ 3,421 Total property and equipment 290,063 270,085 Less: Accumulated depreciation (129,458 ) (98,705 ) Total property and equipment, net $ 160,605 $ 171,380 Other current liabilities: Accrued employee liabilities $ 26,019 $ 25,449 Liabilities from discounts and rebates 16,593 16,907 Income and other taxes payable 3,693 6,468 Restructuring 6,065 2,547 Accrued warranty 4,596 4,514 Other 9,617 9,923 Total other current liabilities $ 66,583 $ 65,808

Debt

Debt	12 Months Ended
	Dec. 31, 2019
Debt Disclosure [Abstract]
Debt	Note 13 — Amended Credit Agreement As of December 31, 2018, the Company, together with certain direct and indirect subsidiaries, had a credit agreement (the “Credit Agreement”) which included a revolving credit note (“U.S. Revolving Note”) with a maximum borrowing capacity of $350,000. On June 27, 2019, the Company entered into an Amended and Restated Credit Agreement (the “Amended Credit Agreement”) with a consortium of lenders and Bank of America, N.A. as administrative agent. The Amended Credit Agreement amended and restated in its entirety the Credit Agreement. The outstanding principal and interest of the U.S. Revolving Note under the Credit Agreement continued and constitute obligations under the Amended Credit Agreement. The Amended Credit Agreement increased the U.S. Revolving Note from $350,000 to $475,000 and extended the maturity from March 17, 2021 to June 27, 2024. Subject to specified conditions, the Company can increase the U.S. Revolving Note or incur secured term loans in an aggregate amount of $175,000. The Amended Credit Agreement also provides $15,000 availability for the issuance of letters of credit and a maximum of $40,000 for swing line borrowing. Any amount of the facility utilized for letters of credit or swing line loans outstanding will reduce the amount available under the Amended Credit Agreement. The Company had $0 and $455 of outstanding letters of credit issued under the Amended Credit Agreement as of December 31, 2019 and 2018, respectively. The U.S. borrowers and guarantors participating in the Amended Credit Agreement have entered into a related amended and restated pledge and security agreement. The amended and restated pledge and security agreement grants a security interest to the lenders in substantially all of the personal property of the Company and its U.S. subsidiaries designated as borrowers to secure their respective obligations under the Amended Credit Agreement, including the stock and membership interests of specified subsidiaries (limited to 66% of the stock in the case of certain non-U.S. subsidiaries). In addition to the security obligations, all obligations under the Amended Credit Agreement are unconditionally guaranteed by certain of the Company’s subsidiaries. The Amended Credit Agreement restricts, among other things, the amount of dividend payments the Company can make to shareholders. The Amended Credit Agreement contains customary affirmative and negative covenants that will prohibit or limit the ability of the Borrowers and any material subsidiary to, among other things, incur additional indebtedness, create liens, pay dividends, make certain types of investments (including acquisitions), enter into certain types of transactions with affiliates, prepay other indebtedness, sell assets, merge with other companies or enter into certain other transactions outside the ordinary course of business requires the Company and its subsidiaries to comply with customary affirmative and negative covenants, and contain customary events of default. These restrictions on the Company’s material subsidiaries have not had and are not expected to have a material impact on the Company’s ability to meet its cash obligations. The Amended Credit Agreement also requires the Company to maintain a minimum Consolidated Interest Coverage Ratio and Consolidated Leverage Ratio, as defined in the agreement. Under the Amended Credit Agreement, U.S. Dollar denominated loans bear interest at either a base rate (“Base Rate Loans”) or Eurocurrency rate (“Eurocurrency Rate Loans”), plus a margin (“Applicable Rate”). The rate for Base Rate Loans is equal to the highest of the Federal Funds Rate (1.55% at December 31, 2019) plus 0.50%, Bank of America’s prime rate (4.75% at December 31, 2019), or the Eurocurrency rate plus 1.00%. The rate for Eurocurrency Rate Loans denominated in U.S. Dollars is equal to the London Interbank Offered Rate (1.76% at December 31, 2019). All loans denominated in a currency other than the U.S. Dollar must be Eurocurrency Rate Loans. Interest is payable at least quarterly. The Applicable Rate varies based on the Consolidated Leverage Ratio reported by the Company. As long as the Company is not in default of the terms and conditions of the Amended Credit Agreement, the lowest and highest possible Applicable Rate is 1.25% and 2.25%, respectively, for Eurocurrency Rate Loans and 0.25% and 1.25%, respectively, for Base Rate Loans. In connection with the Amended Credit Agreement, the Company incurred debt issuance costs of $1,278 which have been capitalized and will be amortized into interest expense over the term of the credit facility. DEG Vietnam Loan The Company also has a fixed interest rate loan with the German Investment Corporation (“DEG”), a subsidiary of KfW Banking Group, a Germany government-owned development bank. The fixed interest rate senior loan agreement with DEG was used to finance the construction and set up of the Vietnam production facility (“DEG Vietnam Loan”). The DEG Vietnam Loan is subject to semi-annual principal payments that began November, 2017 and will end May, 2023. Under the terms of the DEG Vietnam Loan, the Company must maintain a minimum Equity Ratio and Enhanced Equity Ratio, as defined by the DEG Vietnam Loan agreement, based on the financial statements of Gentherm’s wholly owned subsidiary, Gentherm Vietnam Co. Ltd. DEG China Loan The Company had a second DEG loan, which was used to fund capital investments in China (the “DEG China Loan”). The DEG China Loan was subject to semi-annual principal payments that began March 2015 and ended in September 2019. During the third quarter of 2019, the DEG China Loan was paid in full. As of December 31, 2019, we were in compliance, in all material respects, with all terms as outlined in the Amended Credit Agreement and DEG Vietnam Loan. Undrawn borrowing capacity under the U.S. Revolving Note was $403,378 as of December 31, 2019. The following table summarizes the Company’s debt as of December 31, 2019 and 2018. December 31, 2019 2018 Interest Rate Principal Balance Interest Rate Principal Balance Amended Credit Agreement: U.S. Revolving Note (U.S. Dollar Denominations) 3.05 % $ 50,000 4.02 % $ 122,000 U.S. Revolving Note (Euro Denominations) 1.25 % 21,874 1.50 % 5,727 DEG Vietnam Loan 5.21 % 8,750 5.21 % 11,250 DEG China Loan — — 4.25 % 913 Total debt 80,624 139,890 Current maturities (2,500 ) (3,413 ) Long-term debt, less current maturities $ 78,124 $ 136,477 The scheduled principal maturities of our debt as of December 31, 2019 is as follows: Year U.S. Revolving Note DEG Vietnam Note Total 2020 $ — $ 2,500 $ 2,500 2021 — 2,500 2,500 2022 — 2,500 2,500 2023 — 1,250 1,250 2024 71,874 — 71,874 Total $ 71,874 $ 8,750 $ 80,624

Financial Instruments

Financial Instruments	12 Months Ended
	Dec. 31, 2019
Derivative Instruments And Hedging Activities Disclosure [Abstract]
Financial Instruments	Note 14 —Financial Instruments Cash, cash equivalents and restricted cash The Company has cash that is legally restricted as to use or withdrawal. A reconciliation of cash and cash equivalents on the consolidated balance sheets to cash, cash equivalents and restricted cash presented on the consolidated statements of cash flows is as follows: As of December 31, 2019 2018 Cash and cash equivalents presented in the consolidated balance sheets $ 50,443 $ 39,620 Restricted cash $ 2,505 $ — Cash, cash equivalents and restricted cash presented in the consolidated statements of cash flows $ 52,948 $ 39,620 Derivative Financial Instruments The Company is exposed to various market risks including, but not limited to, changes in foreign currency exchange rates, changes in interest rates and commodity price fluctuations. Market risks for changes in interest rates relate primarily to its debt obligations under the Amended Credit Agreement. Foreign currency exchange risks are attributable to sales to foreign customers and purchases from foreign suppliers not denominated in a location’s functional currency, foreign plant operations, intercompany indebtedness, intercompany investments and include exposures to the Euro, Mexican Peso, Canadian Dollar, Hungarian Forint, Macedonian Denar, Ukrainian Hryvnia, Japanese Yen, Chinese Renminbi, Korean Won and Vietnamese Dong. The Company regularly enters into derivative contracts with the objective of managing its financial and operational exposure arising from these risks by offsetting gains and losses on the underlying exposures with gains and losses on the financial instruments used to hedge them. The maximum length of time over which the Company hedges its exposure to foreign currency exchange risks is one year. The Company had foreign currency derivative contracts with a notional value of $14,449 and $33,250 outstanding at December 31, 2019 and 2018, respectively. The principal currency hedged by the Company was the Mexican Peso. The Company does not enter into derivative financial instruments for speculative or trading purposes. The Company’s hedging relationships are formally documented at the inception of the hedge, and hedges must be highly effective in offsetting changes to future cash flows on hedged transactions both at the inception of a hedge and on an ongoing basis to be designated for hedge accounting treatment. For derivative contracts which can be classified as a cash flow hedge, the effective portion of the change in the fair value of the derivative is recorded to accumulated other comprehensive loss in the consolidated balance sheets. When the underlying hedge transaction is realized, the gain or loss included in accumulated other comprehensive loss is recorded in earnings in the consolidated statements of income on the same line as the gain or loss on the hedged item attributable to the hedged risk. The Company records the ineffective portion of foreign currency hedging instruments, if any, to foreign currency gain (loss) in the consolidated statements of income. The Company uses an income approach to value derivative instruments, analyzing quoted market prices to calculate the forward values and then discounts such forward values to the present value using benchmark rates at commonly quoted intervals for the instrument’s full term. Information related to the recurring fair value measurement of derivative financial instruments in the consolidated balance sheet as of December 31, 2019 is as follows: Asset Derivatives Liability Derivatives Hedge Designation Fair Value Hierarchy Balance Sheet Location Fair Value Balance Sheet Location Fair Value Net Asset/ (Liabilities) Foreign currency derivatives Cash flow hedge Level 2 Other current assets $ 1,242 Other current liabilities $ — $ 1,242 Information related to the recurring fair value measurement of derivative financial instruments in the consolidated balance sheet as of December 31, 2018 is as follows: Asset Derivatives Liability Derivatives Hedge Designation Fair Value Hierarchy Balance Sheet Location Fair Value Balance Sheet Location Fair Value Net Asset/ (Liabilities) Foreign currency derivatives Cash flow hedge Level 2 Other current assets $ 92 Other current liabilities $ — $ 92 Information related to the effect of derivative instrument`s on the consolidated statements of income is as follows: Year Ended December 31, Location 2019 2018 Foreign currency derivatives Cost of sales $ 1,976 $ (444 ) Selling, general and administrative — 75 Other comprehensive income 1,151 1,096 Foreign currency gain (loss) (46 ) 50 Total foreign currency derivatives 3,081 777 Commodity derivatives Cost of sales — 145 Other comprehensive income — (218 ) Total commodity derivatives $ — $ (73 ) The Company did not incur any hedge ineffectiveness during the years ended December 31, 2019 and 2018.

Fair Value Measurement

Fair Value Measurement	12 Months Ended
	Dec. 31, 2019
Fair Value Disclosures [Abstract]
Fair Value Measurement	Note 15 — Fair value is defined as the exchange price that would be received to sell an asset or paid to transfer a liability (an exit price) in the principal or most advantageous market for the asset or liability in an orderly transaction between market participants on the measurement date. Fair value measurements are based on one or more of the following three valuation techniques: Market : This approach uses prices and other relevant information generated by market transactions involving identical or comparable assets or liabilities. Income : This approach uses valuation techniques to convert future amounts to a single present value amount based on current market expectations. Cost : This approach is based on the amount that would be required to replace the service capacity of an asset (replacement cost). The Company uses the following fair value hierarchy to measure fair value into three broad levels, which are described below: Level 1 : Quoted prices (unadjusted) in active markets that are accessible at the measurement date for assets or liabilities. The fair value hierarchy gives the highest priority to Level 1 inputs. Level 2 : Inputs, other than quoted market prices included in Level 1, that are observable either directly or indirectly for the asset or liability. Level 3 : Unobservable inputs are used when little or no market data is available. The fair value hierarchy gives the lowest priority to Level 3 inputs. Items Measured at Fair Value on a Recurring Basis Except for derivative financial instruments (see Note 14), pension plan assets (see Note 10) and a corporate owned life insurance policy (see Note 10), the Company has no material financial assets and liabilities that are carried at fair value at December 31, 2019 and 2018. In determining fair value, the Company utilizes valuation techniques that maximize the use of observable inputs and minimize the use of unobservable inputs to the extent possible and also considers counterparty credit risk in its assessment of fair value. Items Measured at Fair Value on a Nonrecurring Basis The Company measures certain assets and liabilities at fair value on a non-recurring basis. As these nonrecurring fair value measurements are generally determined using unobservable inputs, these fair value measurements are classified within Level 3 of the fair value hierarchy. As further described in “Note 4, “Acquisitions and Divestitures", the Company utilized a third-party to assist in the Level 3 fair value estimates of $4,380 related to other intangible assets. The estimated fair values of these assets were based on third-party valuations and management’s estimates, generally utilizing the income approach. As of December 31, 2019 and 2018, there were no additional significant assets or liabilities measured at fair value on a non-recurring basis. Items Not Carried at Fair Value The Company uses an income valuation technique to measure the fair values of its debt instruments by converting amounts of future cash flows to a single present value amount using rates based on current market expectations (Level 2 inputs). As of December 31, 2019 and 2018, the carrying values of the Company’s Credit Agreement indebtedness were not materially different than their estimated fair values because the interest rates on variable rate debt approximated rates currently available to the Company (see Note 13). Discount rates used to measure the fair value of Gentherm’s DEG Vietnam Loan and DEG China Loan are based on quoted swap rates. As of December 31, 2019, the carrying value of the DEG Vietnam Loan was $8,750 as compared to an estimated fair value of $8,785. As of December 31, 2018, the carrying values of the DEG Vietnam Loan and DEG China Loan were $11,250 and $913, respectively, as compared to an estimated fair value of $11,100 and $900, respectively.

Equity

Equity	12 Months Ended
	Dec. 31, 2019
Stockholders Equity Note [Abstract]
Equity	Note 16 — Equity Common Stock The Company is authorized to issue up to 59,991,000 shares, of which 55,000,000 shares shall be common stock, without par value, and 4,991,000 shall be Preferred Stock, without par value. As of December 31, 2019, an aggregate of 32,674,354 of its common stock were issued and outstanding. As of December 31, 2019, there are no preferred stock shares issued or outstanding. The Company’s common stock is listed on the Nasdaq Global Select Market under the symbol, “THRM”, and has the following rights and privileges: ▪ Voting rights. All shares of the Company’s common stock have identical rights and privileges. With limited exceptions, holders of common stock are entitled to one vote for each outstanding share of common stock held of record by each shareholder on all matters properly submitted for the vote of the Company’s shareholders. ▪ Dividend rights . Subject to applicable law, any contractual restrictions and the rights of the holders of outstanding preferred stock, if any, holders of common stock are entitled to receive ratably such dividends and other distributions that the Company’s Board of Directors, in its discretion, declares from time to time. ▪ Liquidation rights . Upon the dissolution, liquidation or winding up of the Company, subject to the rights of the holders of outstanding preferred stock, if any, holders of common stock are entitled to receive ratably the assets of the Company available for distribution to the Company’s s hare holders in proportion to the number of shares of common stock held by each s hare holder. ▪ Conversion, Redemption and Preemptive Rights . Holders of common stock have no conversion, redemption, sinking fund, preemptive, subscription or similar rights. Stock Repurchase Program In December 2016, the Board of Directors of Gentherm Incorporated (“Board of Directors”) authorized a three-year

Reclassifications Out of Accumu

Reclassifications Out of Accumulated Other Comprehensive Income (Loss)	12 Months Ended
	Dec. 31, 2019
Equity [Abstract]
Reclassifications Out of Accumulated Other Comprehensive Income (Loss)	N ote 17 – Reclassifications Out of Accumulated Other Comprehensive Income (Loss) Reclassification adjustments and other activities impacting accumulated other comprehensive income (loss) during the years ended December 31, 2019, December 31, 2018 and December 31, 2017 are as follows: Defined Benefit Pension Plans Foreign Currency Translation Adjustments Foreign Currency Hedge Derivatives Total Balance at December 31, 2018 $ (2,339 ) $ (37,157 ) $ (4 ) $ (39,500 ) Other comprehensive income (loss) before reclassifications (1,264 ) (2,415 ) 2,259 $ (1,420 ) Income tax effect of other comprehensive income (loss) before reclassifications 232 (393 ) (493 ) $ (654 ) Amounts reclassified from accumulated other comprehensive income (loss) into net income — — (1,108 ) a $ (1,108 ) Income taxes reclassified into net income — — 241 $ 241 Net current period other comprehensive income (loss) (1,032 ) (2,808 ) 899 (2,941 ) Balance at December 31, 2019 $ (3,371 ) $ (39,965 ) $ 895 $ (42,441 ) (a) The amounts reclassified from accumulated other comprehensive income (loss) are included in cost of sales. See Note 14 for information related to the effect of commodity and foreign currency derivative instrument`s on our consolidated statements of income. Defined Benefit Pension Plans Foreign Currency Translation Adjustments Commodity Hedge Derivatives Foreign Currency Hedge Derivatives Total Balance at December 31, 2017 $ (2,366 ) $ (17,555 ) $ 277 $ (800 ) $ (20,444 ) Cumulative effect of accounting change due to adoption of ASU 2018-02 (49 ) — 9 — (40 ) Other comprehensive income (loss) before reclassifications 18 (19,212 ) — 1,342 (17,852 ) Income tax effect of other comprehensive income (loss) before reclassifications (15 ) (390 ) — (337 ) (742 ) Amounts reclassified from accumulated other comprehensive income (loss) into net income 73 — (218 ) a (246 ) a (391 ) Income taxes reclassified into net income — — (68 ) 37 (31 ) Net current period other comprehensive income (loss) 27 (19,602 ) (277 ) 796 (19,056 ) Balance at December 31, 2018 $ (2,339 ) $ (37,157 ) $ — $ (4 ) $ (39,500 ) (a) The amounts reclassified from accumulated other comprehensive income (loss) are included in cost of sales. See Note 14 for information related to the effect of commodity and foreign currency derivative instrument`s on our consolidated statements of income. Defined Benefit Pension Plans Foreign Currency Translation Adjustments Commodity Hedge Derivatives Foreign Currency Hedge Derivatives Total Balance at December 31, 2016 $ (2,550 ) $ (65,762 ) $ 241 $ (1,020 ) $ (69,091 ) Other comprehensive income (loss) before reclassifications 166 48,059 254 2,123 50,602 Income tax effect of other comprehensive income (loss) before reclassifications (60 ) 148 (93 ) (570 ) (575 ) Amounts reclassified from accumulated other comprehensive income (loss) into net income 78 — (199 ) a (1,822 ) a (1,943 ) Income taxes reclassified into net income — — 74 489 563 Net current period other comprehensive income (loss) 184 48,207 36 220 48,647 Balance at December 31, 2017 $ (2,366 ) $ (17,555 ) $ 277 $ (800 ) $ (20,444 ) (a) The amounts reclassified from accumulated other comprehensive income (loss) are included in cost of sales. See Note 14 for information related to the effect of commodity and foreign currency derivative instrument`s on our consolidated statements of income. We expect all of the existing gains and losses related to foreign currency and commodity derivatives reported in accumulated other comprehensive income as of December 31, 2019 to be reclassified into earnings during the twelve-month period ending December 31, 2020.

Accounting for Stock Based Comp

Accounting for Stock Based Compensation	12 Months Ended
	Dec. 31, 2019
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Accounting for Stock Based Compensation	Note 18 — On May 16, 2013, the Compensation Committee of the Company’s Board of Directors (the “Board”) approved the Gentherm Incorporated 2013 Equity Incentive Plan (the “2013 Plan”), covering 3,500,000 shares of our Common Stock. On May 19, 2017, the 2013 Plan was amended, increasing the amount of available shares by 2,000,000. The 2013 Plan permits the granting of various awards including stock options (including both nonqualified options and incentive options), stock appreciation rights (“SARs”), restricted stock and restricted stock units, performance shares and certain other awards to employees, outside directors and consultants and advisors of the Company. All shares of our Common Stock that remained available for issuance under the Amended and Restated 2006 Stock Incentive Plan (the “2006 Plan”) and the Gentherm Incorporated 2011 Equity Incentive Plan (the “2011 Plan), were reduced to zero; however, some options under the 2006 Plan are still outstanding. As of December 31, 2019, the Company had an aggregate of 1,308,458 shares of Common Stock available to issue under the 2013 Plan. All plans are administered by the Compensation Committee of the Board. The selection of participants, allotment of shares, determination of price and other conditions are determined by the Compensation Committee at its sole discretion, subject to the terms of the applicable plan, in order to attract and retain personnel instrumental to the success of the Company. During the three-year period ended December 31, 2019, the Company has outstanding stock options, stock appreciation rights (“SARs”), restricted stock awards and restricted stock units to employees, directors and consultants. These awards become available to the recipient upon the satisfaction of a vesting condition, either based on a period of service or based on the performance of a specific achievement. For equity-based awards with a service condition, the requisite service period typically ranges between three to five years for employees and consultants and one year for directors. As of December 31, 2019, there were 190,080 performance-based restricted stock units (“PSUs”) outstanding. These awards vest over a three-year three-year Under FASB ASC Topic 718, the provisions of the PSUs that vest upon the achievement of relative TSR are considered a market condition, and therefore the effect of that market condition is reflected in the grant date fair value for this portion award. A third party was engaged to complete a “Monte Carlo simulation” to account for the market condition. That simulation takes into account the beginning stock price of our common stock, the expected volatilities for the TSR comparator group, the expected volatilities for the Company’s stock price, correlation coefficients, the expected risk-free rate of return and the expected dividend yield of the Company and the comparator group. The single grant-date fair value computed by this valuation method is recognized by the Company in accounting for the awards regardless of the actual future outcome of the relative TSR feature. The grant date fair value of the other PSUs and RSUs are calculated as the closing price of our common stock as quoted on Nasdaq on the grant date multiplied by the number of shares subject to the award. ROIC is considered a performance condition and the grant-date fair value for ROIC PSUs corresponds with management's expectation of the probable outcome of the performance condition as of the grant date. Total unrecognized compensation cost related to non-vested options, restricted stock and SARs outstanding under all of the Company’s equity plans was $13,168 and $15,932 as of December 31, 2019 and 2018, respectively. That cost is expected to be recognized over a weighted average period of two years. Compensation expense for the years ended December 31, 2019, 2018 and 2017 was $8,589, $12,177 and $12,727, respectively, and the related deferred tax benefit was $1,573, 2,434 and $4,339, respectively. No share-based payment arrangements expired during the three-year period ended December 31, 2019. If Gentherm were to realize expired shared-based payment arrangements, they would be reported as a forfeit in the activity roll forward tables below. Stock Options The following table summarizes stock option activity during the three-year period ended December 31, 2019: Options Shares Weighted-Average Exercise Price Weighted-Average Remaining Contractual Term Aggregate Intrinsic Value Outstanding at December 31, 2016 2,103,470 $ 32.72 4.86 $ 12,265 Granted 808,500 37.23 Exercised (202,328 ) 13.62 Forfeited (57,500 ) 42.54 Outstanding at December 31, 2017 2,652,142 $ 35.34 4.76 $ 6,964 Granted — — Exercised (615,358 ) 24.01 Forfeited (383,784 ) 39.59 Outstanding at December 31, 2018 1,653,000 $ 38.53 4.28 $ 3,610 Granted — — Exercised (428,250 ) 38.66 Forfeited (355,750 ) 39.99 Outstanding at December 31, 2019 869,000 $ 37.87 3.51 $ 5,172 Exercisable at December 31, 2017 984,374 $ 29.84 3.44 $ 6,534 Exercisable at December 31, 2018 788,125 $ 38.15 3.71 $ 2,200 Exercisable at December 31, 2019 665,000 $ 38.10 3.23 $ 3,725 The fair value of each option is estimated on the date of grant using the Black-Scholes option-pricing model in order to measure the compensation cost associated with the award. This model incorporates certain assumptions for inputs including a risk-free interest rate, expected dividend yield of the underlying Common Stock, expected option life and expected volatility in the market value of the underlying Common Stock. The following assumptions were used for options issued in the following periods: 2019 2018 2017 Expected volatility N/A N/A 33% Weighted-average expected volatility N/A N/A 33% Expected lives N/A N/A 3 years Risk-free interest rate N/A N/A 1.49−1.93% Expected dividend yield none none none N/A – No new stock options were granted during 2019 and 2018. Expected volatilities are based on the historical volatility of the Company’s Common Stock. The Company uses historical exercise data and several other factors in developing an assumption for the expected lives of stock options, including the average holding period of outstanding options and their remaining terms. The risk-free interest rate is based upon quoted market yields for United States Treasury debt securities. The expected dividend yield is based upon the Company’s history of having never issued a dividend, the limitations to issue a dividend under terms of the Amended Credit Agreement and management’s current expectation regarding future dividends. We do not expect any of the options granted to be forfeited for purposes of computing fair value. The weighted-average grant-date fair value of options granted during the years ended December 31, 2017 was $9.11. There were no stock options granted during the year ended December 31, 2019 and 2018. The total intrinsic value of options exercised during the years ended December 31, 2019, 2018 and 2017 was $1,681, $5,061 and $4,715, respectively. Restricted Stock The following table summarizes restricted stock activity during the three-year period ended December 31, 2019: Unvested Restricted Shares Shares Weighted-Average Grant Date Fair Value Outstanding at December 31, 2016 210,481 $ 39.02 Granted 237,542 37.30 Exercised (165,923 ) 37.99 Forfeited — — Outstanding at December 31, 2017 282,100 $ 38.06 Granted 21,681 35.00 Exercised (130,684 ) 38.62 Forfeited (36,531 ) 37.60 Outstanding at December 31, 2018 136,566 $ 37.16 Granted 19,920 40.16 Exercised (91,566 ) 37.09 Forfeited (30,000 ) 38.05 Outstanding at December 31, 2019 34,920 $ 38.31 The compensation cost associated with restricted shares is estimated on the date of grant using quoted market prices (Level 1 input). The total fair value of restricted shares vested in 2019, 2018 and 2017 was $3,697, $4,599 and $6,006, respectively. Restricted Stock Units The following table summarizes restricted stock unit activity during the two-year period ended December 31, 2019: Performance-Based Awards Unvested Restricted Stock Units Time Vesting Shares ROIC Target Shares TSR Target Shares Total Outstanding at December 31, 2017 — — — — Granted 86,392 64,785 64,792 215,969 Vested — — — — Forfeited — — — — Outstanding at December 31, 2018 86,392 64,785 64,792 215,969 Granted 107,391 56,380 56,375 220,146 Vested (23,956 ) — — (23,956 ) Forfeited (28,086 ) (26,124 ) (26,128 ) (80,338 ) Outstanding at December 31, 2019 141,741 95,041 95,039 331,821 No restricted stock units were granted prior to 2018. Stock Appreciation Rights The following table summarizes SARs activity during the three-year period ended December 31, 2019: Stock Appreciation Rights Shares Weighted-Average Exercise Price Weighted-Average Remaining Contractual Term Aggregate Intrinsic Value Outstanding at December 31, 2016 1,244,600 $ 36.11 4.80 $ 3,511 Granted 235,000 38.05 Exercised (94,250 ) 22.21 Forfeited (193,000 ) 32.53 Outstanding at December 31, 2017 1,192,350 $ 38.17 4.36 $ 2,278 Granted — — Exercised (204,250 ) 26.35 Forfeited — — Outstanding at December 31, 2018 988,100 $ 40.61 3.57 $ 2,064 Granted — — Exercised (179,500 ) 32.84 Forfeited (254,350 ) 42.63 Outstanding at December 31, 2019 554,250 $ 39.41 2.84 $ 2,981 Exercisable at December 31, 2017 613,808 $ 37.68 3.72 1,904 Exercisable at December 31, 2018 683,600 $ 41.21 3.09 1,728 Exercisable at December 31, 2019 401,438 $ 39.62 2.46 2,135 The total intrinsic value of SARs converted during the years ended December 31, 2019, 2018 and 2017 was $1,588, $3,532 and $1,495, respectively.

Leases

Leases	12 Months Ended
	Dec. 31, 2019
Leases [Abstract]
Leases	Note 19 — Leases Components of lease expense for the year ended December 31, 2019 are as follows: Year Ended December 31, 2019 Lease cost: Operating lease cost $ 5,899 Short-term lease cost 3,444 Sublease income (128 ) Total lease cost $ 9,215 Other information related to leases is as follows: Year Ended December 31, 2019 Supplemental cash flow information: Gain on sales and leaseback transactions, net $ 207 Cash paid for amounts included in the measurement of lease liabilities: Operating cash flows from operating leases $ 6,059 Right-of-use lease assets obtained in exchange for lease obligations: Operating leases $ 4,111 December 31, 2019 Weighted-average remaining lease term: Operating leases 4.5 years Weighted-average discount rate: Operating leases 5.46 % A summary of operating leases as of December 31, 2019, under all non-cancellable operating leases with terms exceeding one year is as follows: 2020 $ 4,847 2021 2,949 2022 1,602 2023 796 2024 790 2025 or later 1,832 Total future minimum lease payments 12,816 Less: imputed interest (1,479 ) Total $ 11,337 . As previously disclosed in our 2018 Annual Report on Form 10-K and under the previous lease accounting, maturities of lease liabilities were as follows as of December 31, 2018: 2019 $ 7,530 2020 5,016 2021 2,468 2022 2,152 2023 1,532 2024 or later 4,021 Total $ 22,719

Commitments and Contingencies

Commitments and Contingencies	12 Months Ended
	Dec. 31, 2019
Commitments And Contingencies Disclosure [Abstract]
Commitments and Contingencies	Note 20 — The Company may be subject to various legal actions and claims in the ordinary course of its business, including those arising out of breach of contracts, product warranties, product liability, intellectual property rights, environmental matters, regulatory matters and employment-related matters. The Company establishes accruals for matters which it believes that losses are probable and can be reasonably estimated. Although it is not possible to predict with certainty the outcome of these matters, the Company is of the opinion that the ultimate resolution of these matters will not have a material adverse effect on its consolidated results of operations or financial position. Product liability and warranty reserves are recorded separately from legal reserves, as described below. Product Liability and Warranty Matters The Company accrues warranty obligations for products sold based on management estimates of future failure rates and current claim cost experience, with support from the sales, engineering, quality and legal functions. Using historical information available to the Company, including claims already filed by customers, the warranty accrual is adjusted quarterly to reflect management’s best estimate of future claims. The Company maintains liability insurance coverage at levels based on commercial norms and historical claims experience. The Company can provide no assurances that it will not experience material claims in the future or that it will not incur significant costs to defend such claims. The following is a reconciliation of the changes in accrued warranty costs: Year Ended December 31, 2019 2018 Balance at beginning of year $ 4,514 $ 5,382 Warranty claims paid (584 ) (905 ) Warranty expense for products shipped during the current period 2,370 2,678 Adjustments to warranty estimates from prior periods (1,660 ) (608 ) Acquisition of business 21 — Reclassification to liabilities held for sale — (1,884 ) Adjustments due to currency translation (65 ) (149 ) Balance at end of year $ 4,596 $ 4,514 Employees Approximately 25% of the Company’s workforce are members of industrial trade unions and are employed under the terms of various labor agreements. None of these agreements expire in 2020.

Selected Quarterly Information

Selected Quarterly Information (Unaudited)	12 Months Ended
	Dec. 31, 2019
Selected Quarterly Financial Information [Abstract]
Selected Quarterly Information (Unaudited)	Note 21 — Selected Quarterly Information (Unaudited) Three Months Ended, March 31, 2019 June 30, 2019 September 30, 2019 December 31, 2019 Product revenues $ 257,921 $ 243,326 $ 240,056 $ 230,381 Gross margin 75,307 72,714 74,692 65,622 Net income 8,414 2,751 15,887 10,454 Basic earnings per share $ 0.25 $ 0.08 $ 0.48 $ 0.32 Diluted earnings per share $ 0.25 $ 0.08 $ 0.48 $ 0.32 Three Months Ended, March 31, 2018 June 30, 2018 September 30, 2018 December 31, 2018 Product revenues (a) $ 264,586 $ 266,400 $ 261,504 $ 256,015 Gross margin 81,242 77,092 75,704 70,820 Net income (loss) 12,966 16,659 (355 ) 12,629 Basic earnings (loss) per share $ 0.35 $ 0.46 $ (0.01 ) $ 0.37 Diluted earnings (loss) per share $ 0.35 $ 0.45 $ (0.01 ) $ 0.36 a) Product revenues for 2018 have been adjusted to conform with the current year presentation, related to a reclassification of customer relationship amortization from product revenues to selling, general and administrative expenses. See Note 2, “Significant Accounting Policies” to the consolidated financial statements included in this Report for further details regarding these adjustments.

Valuation and Qualifying Accoun

Valuation and Qualifying Accounts	12 Months Ended
	Dec. 31, 2019
Valuation And Qualifying Accounts [Abstract]
Valuation and Qualifying Accounts	GENTHERM INCORPORATED SCHEDULE II — VALUATION AND QUALIFYING ACCOUNTS For the Years Ended December 31, 2019, 2018 and 2017 (In thousands) Description Balance at Beginning of Period Charged to Costs and Expenses Charged to Other Accounts Deductions from Reserves Balance at End of Period Allowance for Doubtful Accounts Year Ended December 31, 2017 1,391 1,239 51 (1,708 ) 973 Year Ended December 31, 2018 973 1,005 (121 ) (1,006 ) 851 Year Ended December 31, 2019 851 969 (8 ) (619 ) 1,193 Allowance for Deferred Income Tax Assets Year Ended December 31, 2017 19,304 6,700 1,574 — 27,578 Year Ended December 31, 2018 27,578 — (14,009 ) (3,592 ) 9,977 Year Ended December 31, 2019 9,977 19,277 (491 ) — 28,763 Reserve for Inventory Year Ended December 31, 2017 4,790 3,521 302 (726 ) 7,887 Year Ended December 31, 2018 7,887 2,712 (1,047 ) (3,282 ) 6,270 Year Ended December 31, 2019 6,270 1,679 (56 ) (1,820 ) 6,073

Summary of Significant Accoun_2

Summary of Significant Accounting Policies (Policies)	12 Months Ended
	Dec. 31, 2019
Accounting Policies [Abstract]
Basis of Presentation	Basis of Presentation The consolidated financial statements have been prepared in accordance with accounting principles generally accepted in the United States of America (“GAAP”). Certain prior period amounts have been reclassified to conform to current period presentation. Notably, $10,246 and $8,308 in customer relationship amortization was reclassified from product revenues to selling, general and administrative expenses for the fiscal years ended December 31, 2018 and 2017, respectively, and the results from asset disposals during 2017 were reclassified from other income to cost of sales for the year ended December 31, 2017.
Principles of Consolidation	Principles of Consolidation The consolidated financial statements include the accounts of the Company, its wholly owned subsidiaries and those entities in which it has a controlling financial interest. Investments in affiliates in which Gentherm does not have control but does have the ability to exercise significant influence over operating and financial policies are accounted for under the equity method. When Gentherm does not have the ability to exercise significant influence (generally when ownership interest is less than 20%), investments in affiliates are measured at cost, less impairments, adjusted for observable price changes in orderly transactions for identical or similar investments of the same issuer.
Use of Estimates	Use of Estimates The preparation of financial statements in conformity with GAAP requires the use of estimates and assumptions that affect amounts reported therein. Considerable judgment is involved in making these determinations and the use of different estimates or assumptions could result in significantly different results. Management believes its assumptions and estimates are reasonable and appropriate. However, actual results could differ from those reported herein.
Segment Reporting	Segment Reporting The Company has two reportable segments: Automotive Industrial these businesses and division are presented together as one reporting segment because of their historical joint concentration on identifying new markets and product applications based on thermal management technologies .
Revenue Recognition	Revenue Recognition Revenue is recognized from agreements containing enforceable rights and obligations, when promised goods are delivered or services are completed. Taxes assessed by a governmental authority that are both imposed on and concurrent with a specific revenue-producing transaction, that are collected by the Company from a customer, are excluded from product revenues. Shipping and handling fees billed to customers are included in product revenues, while costs of shipping and handling are included in cost of sales. Automotive Revenues The Company provides production parts to its customers under long-term supply agreements (“LTAs”). The duration of an LTA is generally consistent with the life cycle of a vehicle; however, an LTA does not reach the level of a performance obligation until Gentherm receives either a purchase order and/or a materials release from the customer for a specific number of production parts at a specified price, at which point an enforceable contract exists. Revenue is recognized when control of the production parts has transferred to the customer according to the terms of the contract, which typically occurs when the parts are shipped or delivered to the customer’s premises. Revenue is measured as the amount of consideration we expect to receive in exchange for transferring production parts. Certain LTAs provide for annual price reductions over the production life of the vehicle. Agreements that are determined to provide customers with purchase option discounts that would not be received without entering into the contract are considered to contain a material right (for example, a discount given to a customer that is incremental to the range of discounts typically given to that class of customer). The material right represents a purchase option that provides the customer with the ability to purchase additional production parts at a set price in the future and is accounted for as a separate performance obligation. Under these circumstances, each transfer of production parts under the LTA requires allocation of the purchase price to the production part and the purchase option. As a practical alternative to estimating the standalone selling price of an option, the Company allocates transaction price to the purchase option by reference to the production part volumes expected to be ordered and the consideration expected to be received over the life of the vehicle program. The production part’s relative standalone selling price observed under the LTA is subtracted from the total amount of consideration expected to be received in exchange for transferring of parts under the current contract and the difference is allocated to the purchase option. Revenue from options containing a material right is recognized when the amounts billed by the customer for production parts transferred, under the LTA, is less than the standalone selling price of those production parts. Medical Revenues Revenues from our patient temperature management business unit are generated from the sale of products and equipment. Our medical products and equipment focus on body and blood temperature management. The Company sells medical products and equipment primarily through distributor and group purchasing organization agreements. These agreements allow member participants to the distributor or group purchasing organization to make purchases at discounted prices negotiated by the distributor or group purchasing organization. A rebate is incurred at the point in time a member participant purchases product covered under these types of agreements. Rebates are accounted for as variable consideration, using an expected value, probability weighted approach, based on the level of sales to the distributor and the time lag between the initial sale and the rebate claim in determining the transaction price of a contract. Revenue is recognized at the point in time the medical products or equipment is transferred to the customer. GPT and CSZ-IC Revenues Revenues from our divested businesses, GPT and CSZ-IC, were generated from the sale of products and services. GPT and CSZ-IC customers commonly entered into multiple-element agreements for the purchase of products and services. Installation services, for example, were separate and distinct performance obligations that were often included in contracts to purchase customized environmental test chambers. Depending on the application, delivery of an environmental test chamber or remote power generation system to the customer’s place of business could range from two weeks to nine months from commencement of the contract. Installation services, while reliant on the specifications and timing from the customer, rarely remained incomplete more than two months after delivery. Revenues allocated to environmental test chambers or remote power systems were based on the stand-alone selling price of the products themselves. Judgement was used to determine the degree to which early pay discounts and other credits were utilized in the calculation of standalone selling price, and only included to the extent it was probable that a significant reversal of any incremental revenue would not occur. Revenues were recognized at the point in time the chamber or power system was shipped to the customer. For contracts that also included a promise for installation, the portion of total transaction price allocated to the installation was recognized as revenue at the point in time the installation was complete. GPT and CSZ-IC often required milestone payments for contracts to provide environmental test chambers or remote power systems to customers. Milestone payments did not provide the Company with a right to payment for the work completed to date and did not represent the satisfaction of a performance obligation. Milestone payments were deferred and reported within unearned revenue until construction was complete and the unit had been delivered or was installed. If the environmental test chamber contract included a separate promise to provide installation services, any installation-related payments received from the customer were deferred until the point in time the installation was complete. The total amount of unearned revenue associated with environmental chamber and remote power system contracts, including environmental chamber contracts that included a separate obligation to provide installation, that existed as of December 31, 2018 was $5,296 and is classified within Liabilities held for sale on the consolidated balance sheet at December 31, 2018. See Note 4 to our consolidated financial statements for information about the assets and liabilities that was classified as held for sale. Assets Recognized from the Costs to Obtain a Contract with a Customer We recognize an asset for the incremental costs of obtaining a contract with a customer if the benefits of those costs are expected to be realized for a period greater than one year. Total capitalized costs to obtain a contract were $1,893 and $374 as of December 31, 2019 and 2018, respectively. These amounts are recorded in other current assets and are being amortized into product revenues over the expected production life of the program. During the year ended December 31, 2019, $1,006 was amortized into product revenues. During the year ended December 31, 2018, amounts amortized into product revenues was immaterial.
Cash and Cash Equivalents and Restricted Cash	Cash and Cash Equivalents and Restricted Cash The Company considers all highly liquid investments purchased with original maturities of less than 90 days to be cash equivalents. Cash balances in individual banks may exceed the federally insured limit by the Federal Deposit Insurance Corporation. The Company had cash and cash equivalents of $35,735 and $31,976 held in foreign jurisdictions as of December 31, 2019 and 2018, respectively. Restricted cash includes cash that is legally restricted as to use or withdrawal.
Disclosures About Fair Value of Financial Instruments	Disclosures About Fair Value of Financial Instruments The carrying amounts of financial instruments comprising cash and cash equivalents, short-term investments and accounts receivable approximate fair value because of the short maturities of these instruments. The carrying amount of the Company’s U.S. Revolving Note approximates its fair value because interest charged on the loan balance is variable. See Note 15 for information about the techniques used to assess the fair value of financial assets and liabilities, including our fixed rate debt instruments.
Concentration of Credit Risk	Concentration of Credit Risk Financial assets, which subject the Company to concentration of credit risk, consist primarily of cash equivalents, short-term investments and accounts receivable. Cash equivalents consist primarily of money market funds managed by major financial services companies. The credit risk for these cash equivalents is considered low. The Company does not require collateral from its customers. As of December 31, 2019, Lear, Adient and Magna comprised 21%, 21% and 7% respectively, of the Company’s accounts receivable balance. As of December 31, 2018, Lear, Adient, and Faurecia comprised 21%, 18% and 9% respectively, of the Company’s accounts receivable balance. These accounts are currently in good standing.
Accounts Receivable	Accounts Receivable Accounts receivable are stated at the invoiced amount, less allowance for doubtful accounts for estimated amounts not expected to be collected, and do not bear interest. We record an allowance for doubtful accounts once exposure to collection risk of an account receivable is specifically identified. We analyze the length of time an account receivable is outstanding, as well as a customer’s payment history and ability to pay to determine the need to record an allowance for doubtful accounts. We write-off accounts receivable when they become uncollectible.
Inventory	Inventory The Company’s inventory is measured at the lower of cost or net realizable value, with cost being determined using the first-in first-out basis. Raw materials, consumables and commodities are measured at cost of purchase and unfinished and finished goods are measured at cost of production, using the weighted average method. If the net realizable value expected on the reporting date is below cost, a write-down is recorded to adjust inventory to its net realizable value. We recognize a reserve for obsolete and slow-moving inventories based on estimates of future sales and an inventory item’s capacity to be repurposed for a different use. We consider the number of months supply on hand based on current planned requirements, uncommitted future projections and historical usage in estimating the inventory reserve.
Property and Equipment	Property and Equipment Property and equipment, including additions and improvements, are recorded at cost less accumulated depreciation. Expenditures for repairs and maintenance are charged to expense as incurred. When property or equipment is retired or otherwise disposed of, the related cost and accumulated depreciation are removed from the accounts. Gains or losses from retirements and disposals are recorded as operating income or expense. Depreciation is computed using the straight-line method. The estimated useful lives of the Company’s property and equipment are as follows: Asset Category Useful Life Buildings and improvements 2 to 50 years Plant and equipment 1 to 20 years Production tooling 2 to 10 years Leasehold improvements Term of lease Information technology 1 to 10 years The Company recognized depreciation expense of $33,639, $36,270 and $32,224 for the years ended December 31, 2019, 2018 and 2017, respectively.
Goodwill and Other Intangible Assets	Goodwill and Other Intangible Assets Goodwill and other intangible assets recorded in conjunction with business combinations are based on the Company’s estimate of fair value, as of the date of acquisition. Amortization is computed using the straight-line method. The fair value and corresponding useful lives for acquired intangible assets are listed below as follows: Asset Category Useful Life Customer relationships 6-15 years Technology 4-8 years Product development costs 1-15 years Tradenames Indefinite Our business strategy largely centers on designing products based upon internally developed and purchased technology. When possible and having value to the business strategy, we protect these technologies with patents. Our policy is to expense all costs associated with the development and issuance of new patents as incurred. Such costs are classified as research and development expenses in our consolidation statements of income. Patents purchased as part of a business combination are capitalized based on their fair values. Periodically, we review the recoverability and remaining lives of our capitalized patents, and if necessary, make adjustments to reported amounts, based upon unfavorable impacts from market conditions, the emergence of competitive technologies and changes in our projected business plans.
Impairments of Long-Lived Assets, Other Intangible Assets and Goodwill	Impairments of Long-Lived Assets, Other Intangible Assets and Goodwill Whenever events or changes in circumstances indicate that it is more likely than not that a long-lived asset’s fair value, other intangible asset’s fair value or a reporting unit’s fair value is less than it’s carrying amount, the Company then compares the fair value of the long-lived asset, other intangible asset or reporting unit to the related net book value. If the net book value of a long-lived asset, other intangible asset or reporting unit exceeds its fair value, an impairment loss is recognized for the amount by which the carrying amount of the asset exceeds its fair value. The fair value of a long-lived asset, other intangible asset or reporting unit is estimated by analyzing internal inputs (level 3) to calculate forward values and discounting those values to the present value. Goodwill is not amortized but is tested for impairment on at least an annual basis.
Accrued Warranty Costs	Accrued Warranty Costs The Company accrues warranty obligations for products sold based on management estimates of future failure rates and current claim cost experience, with support from the sales, engineering, quality and legal functions. Using historical information available to the Company, including claims already filed by customers, the warranty accrual is adjusted quarterly to reflect management’s best estimate of future claims.
Tooling	Tooling The Company incurs costs related to tooling used in the manufacture of products sold to its customers. In some cases, the Company enters into contracts with its customers whereby the Company incurs the costs to design, develop and purchase tooling and is then reimbursed by the customer under a reimbursement contract. Tooling costs that will be reimbursed by customers are included in other current assets at the lower of accumulated cost or the customer reimbursable amount. As of December 31, 2019 and 2018, respectively, $5,347 and $6,628 of reimbursable tooling was capitalized within other current assets. Company-owned tooling is included in property and equipment and depreciated over its expected useful life, generally two to ten years. Management periodically evaluates the recoverability of tooling costs, based on estimated future cash flows, and makes provisions, where appropriate, for tooling costs that will not be recovered.
Research and Development Expenses	Research and Development Expenses Research and development activities are expensed as incurred. The Company groups development and prototype costs and related reimbursements in research and development. The Company recognizes amounts due as reimbursements for expenses as these expenses are incurred.
Leases	Leases The Company has operating leases for office, manufacturing and research and development facilities, as well as land leases for certain manufacturing facilities that are accounted for as operating leases. We also have operating leases for office equipment and automobiles. Excluding land leases, our leases have remaining lease terms ranging from less than 1 year to 7 years and may include options to extend the lease for an additional term equal to the original term of the lease. Land leases have remaining lease terms that range from 41 to 43 years and some which specify that the end of the lease term is at the discretion of the lessee. We do not have lease arrangements with related parties. The Company determines whether a contractual arrangement is or contains a lease at inception. Leases that are operating in nature are recognized in operating lease right-of-use assets, current lease liabilities and non-current lease liabilities on our consolidated balance sheets. While Gentherm is not currently party to any leases that qualify as financing leases, right-of-use assets and liabilities recognized from financing leases would be presented separately from the right-of-use assets and liabilities recognized from operating leases on our consolidated balance sheet. Lease liabilities are measured initially at the present value of the sum of the future minimum rental payments at the commencement date of the lease. Lease payments that will vary in the future due to changes in facts and circumstances are excluded from the calculation of rental payments, unless those variable payments are based on an index or rate. Rental payments are discounted using an incremental borrowing rate based on the Company’s credit rating, determined on a fully collateralized loan basis from information available at commencement date, and the duration of the lease term (the “reference rate”). Judgement is used to assess the importance of risk factor inputs during the computation of the Company’s credit rating. For significant leases at foreign subsidiaries denominated in U.S. Dollars, a risk premium associated with the borrower subsidiary’s country is added to the reference rate. For significant leases at foreign subsidiaries denominated in a foreign currency, the U.S. Dollar risk free rate with a duration similar to that of the lease term is subtracted from the reference rate and a corresponding foreign currency risk free rate with a duration similar to that of the lease term is added to the reference rate. Judgement is used to determine whether foreign subsidiary leases are significant. Operating lease right-of-use assets are measured at the amount of the lease liability, adjusted for prepaid or accrued lease payments, lease incentive received, and initial direct costs incurred, as applicable. Periods covered by an option to extend the lease are initially included in the measurement of an operating lease right-of-use asset and lease liability only when it is reasonably certain we will exercise the option. Gentherm’s lease agreements do not contain residual value guarantees or impose restrictions or covenants on the Company. For all classes of underlying assets, the Company accounts for leases that contain separate lease and non-lease components as containing a single lease component. The Company does not recognize lease right-of-use assets and lease liabilities from leases with an original lease term of 12 months or less and, instead, recognizes rent payments on a straight-line basis over the lease term in the Company’s consolidated statements of income.
Income Taxes	Income Taxes The Company records income tax expense using the liability method which specifies that deferred tax assets and liabilities be measured each year based on the difference between the financial statement and tax base of assets and liabilities at the applicable enacted tax rates. A valuation allowance is provided for deferred tax assets when management considers it more likely than not that the asset will not be realized. At December 31, 201 9 and 201 8 , a valuation allowance has been provided for certain deferred tax assets which the Company has concluded are more likely than not to not be realized. If future annual taxable income were to be significantly less than current and projected levels, there is a risk that certain of our deferred tax assets not already provided for by the valuation allowance would expire prior to utilization. The Company recognizes the financial statement benefit of a tax position only after determining that the relevant tax authority would more likely than not sustain the position following an audit. For tax positions meeting the more-likely-than-not threshold, the amount recognized in the financial statements is the largest benefit that has a greater than 50 percent likelihood of being realized upon ultimate settlement with the relevant tax authority. The Company recognizes interest and penalties related to income tax matters in income tax expense.
Derivative Financial Instruments - Hedge Accounting	Derivative Financial Instruments – Hedge Accounting The Company accounts for some of its derivative financial instruments as cash flow hedges as defined in Financial Accounting Standards Board (“FASB”) Accounting Standards Codification (“ASC”) Topic 815. For derivative contracts which can be classified as a cash flow hedge, the effective potion of the change in the fair value of the derivative is recorded to accumulated other comprehensive income in the consolidated balance sheets. When the underlying hedge transaction is realized, the gain or loss included in accumulated other comprehensive income is recorded in earnings in the consolidated statements of income on the same line as the gain or loss on the hedged item attributable to the hedged risk. Any ineffective portion of the gain or loss is recognized in the consolidated statements of income under foreign currency gain (loss) or revaluation of derivatives gain (loss). These hedging transactions and the respective correlations meet the requirements for hedge accounting.
Earnings Per Share	Earnings per Share Basic earnings per share is computed by dividing net income by the weighted average number of shares of Common Stock outstanding during the respective period. The Company’s diluted earnings per common share give effect to all potential shares of Common Stock outstanding during a period that are not anti-dilutive. In computing the number of diluted shares outstanding, the treasury stock method is used in order to arrive at a net number of shares created upon the conversion of Common Stock equivalents.
Stock Based Compensation	Stock Based Compensation Share based payments that involve the issuance of Common Stock to employees, including grants of employee stock options, restricted stock, and time-based and performance-based restricted stock units, are recognized in the financial statements as compensation expense based upon the fair value on the date of grant. Performance-based restricted stock unit awards are measured based on either a target return on invested capital ratio (“ROIC”), as defined in the award agreement, for a specified fiscal year, or the Company’s common stock market price returning a target total shareholder return (“TSR”), as defined, during a specific three-year measurement period. Upon achievement of the performance measurement, performance-based restricted stock units vest over a three-year Share based payments that are satisfied only by the payment of cash, such as stock appreciation rights, are accounted for as liabilities. The liability is reported at market value of the vested portion of the underlying units. During each period, the change in the liability is recorded as compensation expense during periods when the liability increases or income during periods in which the liability decreases.
Pension Plans	Pension Plans The Company’s obligations and expenses for its pension plans are dependent on the Company’s selection of discount rate, expected long-term rate of return on plan assets and other assumptions used by actuaries to calculate these amounts.
Assets and Liabilities Held for Sale	Assets and Liabilities Held for Sale The Company classifies assets and liabilities (disposal groups) to be sold as held for sale in the period in which all of the following criteria are met: management, having the authority to approve the action, commits to a plan to sell the disposal group; the disposal group is available for immediate sale in its present condition subject only to terms that are usual and customary for sales of such disposal groups; an active program to locate a buyer and other actions required to complete the plan to sell the disposal group have been initiated; the sale of the disposal group is probable, and transfer of the disposal group is expected to qualify as a completed sale within one year, except if events or circumstances beyond the Company’s control extend the period of time required to sell the disposal group beyond one year; the disposal group is being actively marketed for sale at a price that is reasonable in relation to its current fair value; and actions required to complete the plan indicate that it is unlikely that significant changes to the plan will be made or that the plan will be withdrawn. The Company initially measures a disposal group that is classified as held for sale at the lower of its carrying value or fair value less any costs to sell. Any loss resulting from this measurement is recognized in the period in which the held for sale criteria are met. Gains are not recognized on the sale of a disposal group until the date of sale. The Company assesses the fair value of a disposal group, less any costs to sell, each reporting period it remains classified as held for sale and reports any subsequent losses as an adjustment to the carrying value of the disposal group. The Company reports assets and liabilities of the disposal group in the line items assets held for sale and liabilities held for sale in the Consolidated Balance Sheet in the period the disposal group meets the criteria to be classified as held for sale. See Note 4 to our consolidated financial statements for information about the assets and liabilities classified as held for sale.
Subsequent Events
Recently Adopted Accounting Pronouncements	Recently Adopted Accounting Pronouncements Leases In February 2016, the FASB issued ASU 2016-02, “Leases (Topic 842)” (as amended, “ASU 2016-02”). ASU 2016-02 requires lessees to recognize a lease liability and a right-of-use asset on the balance sheet for all leases, except for short-term leases with terms of twelve months or less. The lease liability represents the lessee’s obligation to make lease payments arising from a lease, and is measured as the present value of the lease payments. The right-of-use asset represents the lessee’s right to use a specified asset for the lease term, and is measured at the lease liability amount, adjusted for lease prepayment, lease incentives received and the lessee’s initial direct costs. Leases are to be classified as finance or operating leases, with classification affecting the pattern and classification of expense recognition in the statements of income (loss). The Company adopted ASU 2016-02 on January 1, 2019, by applying the modified retrospective method and recognized a cumulative-effect adjustment to the opening balance in retained earnings. Financial information has not been updated and disclosures under the new standard have not been provided to dates and periods before January 1, 2019 ASU 2016-02 did not have a presentation impact on the Company’s consolidated statements of income or cash flows for the year ended December 31, 2019 but did have a n impact on the consolidated balance sheet as of December 31, 2019. The cumulative effects of the changes made to the Company’s consolidated balance sheet as of January 1, 2019 for the adoption of ASU 2016-02 were as follows: Balance as of December 31, 2018 Adjustments due to adoption of ASU 2016-02 Balance as of January 1, 2019 Other current assets $ 54,363 $ (74 ) $ 54,289 Assets held for sale 69,699 4,127 73,826 Operating lease right-of-use assets — 13,019 13,019 Liabilities held for sale 13,062 4,136 17,198 Deferred income tax liabilities 1,177 114 1,291 Non-current lease liabilities — 12,561 12,561 Accumulated earnings 363,965 261 364,226 The Company elected the package of practical expedients provided in ASU 2016-02, which permits a lessee to not reassess under the new standard its prior conclusions about lease identification, lease classification and initial direct costs. Gentherm elected the use-of-hindsight to determine whether lease terms included periods covered by the lessee’s option to extend or terminate a lease, whether to purchase the underlying asset at the end of the lease agreement, and in assessing impairment of operating lease right-of-use assets. Finally, Gentherm elected to not assess whether existing or expired land easements that were not previously accounted for as leases are or contain a lease. Land easements previously accounted for as leases were not eligible for this practical expedient.
Recently Issued Accounting Pronouncements Not Yet Adopted	Recently Issued Accounting Pronouncements Not Yet Adopted Expected Credit Losses In June 2016, the FASB issued ASU 2016-13, “Financial Instruments – Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments.” ASU 2016-13 requires the measurement of all expected credit losses for financial assets held at the reporting date based on historical experience, current conditions and reasonable and supportable forecasts. ASU 2016-13 is effective for annual and interim periods beginning after December 15, 2019. Early adoption of the amendments in this update is permitted. The Company is currently in the process of determining the impact the implementation of ASU 2016-13 will have on the consolidated financial statements and note disclosures. The adoption of this guidance is not expected to have a significant impact on the Company’s consolidated financial statements. Cloud Computing Arrangements That Are Service Contracts In August 2018, the FASB issued ASU 2018-15, “Intangibles – Goodwill and Other – Internal-Use Software (Subtopic 350-40): Customer’s Accounting for Implementation Costs Incurred in a Cloud Computing Arrangement That Is a Service Contract.” ASU 2018-15 requires implementation costs incurred by customers in cloud computing arrangements to be deferred and recognized over the term of the arrangement if those costs would be capitalized by the customer in a software licensing arrangement under the internal-use software guidance. ASU 2018-15 is effective for annual and interim periods beginning after December 15, 2019. Early adoption of the amendments in this update is permitted. We are currently in the process of determining the impact the implementation of ASU 2018-15 will have on the Company’s financial statements and note disclosures. The adoption of this guidance is not expected to have a significant impact on the Company’s consolidated financial statements. Retirement Benefits In August 2018, the FASB issued ASU 2018-14, “Compensation – Retirement Benefits – Defined Benefit Plans – General (Subtopic 715-20): Disclosure Framework – Changes to the Disclosure Requirements for Defined Benefit Plans.” ASU 2018-14 removes certain disclosure requirements, including (i) the amounts in accumulated other comprehensive income expected to be recognized as components of net periodic benefit cost over the next fiscal year, and (ii) the amount and timing of plan assets expected to be returned to the employer. ASU 2018-14 also adds new disclosure requirements, including (i) the weighted-average interest crediting rates for cash balance plans and other plans with promised interest crediting rates and (ii) an explanation of the reasons for significant gains and losses related to changes in the benefit obligation for the period. ASU 2018-14 is effective for annual periods ending after December 15, 2020. Early adoption of the amendments in this update is permitted. We are currently in the process of determining the impact the implementation of ASU 2018-14 will have on the Company’s financial statement note disclosures. The adoption of this guidance is not expected to have a significant impact on the Company’s consolidated financial statements. Fair Value Measurement In August 2018, the FASB issued ASU 2018-13, “Fair Value Measurement (Topic 820): Disclosure Framework – Changes to the Disclosure Requirements for Fair Value Measurement.” ASU 2018-13 removes certain disclosure requirements, including (i) the amount of and reasons for transfers between Level 1 and Level 2 of the fair value hierarchy, (ii) the policy for timing of transfer between levels, and (iii) the valuation processes for Level 3 fair value measurements. ASU 2018-13 also adds new disclosure requirements, including (i) the changes in unrealized gains and losses for the period included in other comprehensive income for recurring Level 3 fair value measurements held at the end of the reporting period and (ii) the range and weighted average of significant unobservable inputs used to develop Level 3 fair value measurements. ASU 2018-13 is effective for annual and interim periods beginning after December 15, 2019. Early adoption of disclosures that are removed is permitted, but adoption is delayed for the new additional disclosures until their effective date. We are currently in the process of determining the impact the implementation of ASU 2018-13 will have on the Company’s financial statement note disclosures. The adoption of this guidance is not expected to have a significant impact on the Company’s consolidated financial statements.

Summary of Significant Accoun_3

Summary of Significant Accounting Policies (Tables)	12 Months Ended
	Dec. 31, 2019
Accounting Policies [Abstract]
Estimated Useful Lives of Property and Equipment	Depreciation is computed using the straight-line method. The estimated useful lives of the Company’s property and equipment are as follows: Asset Category Useful Life Buildings and improvements 2 to 50 years Plant and equipment 1 to 20 years Production tooling 2 to 10 years Leasehold improvements Term of lease Information technology 1 to 10 years
Fair Value and Corresponding Useful Lives for Acquired Intangibles Assets	Amortization is computed using the straight-line method. The fair value and corresponding useful lives for acquired intangible assets are listed below as follows: Asset Category Useful Life Customer relationships 6-15 years Technology 4-8 years Product development costs 1-15 years Tradenames Indefinite

New Accounting Pronouncements (

New Accounting Pronouncements (Tables)	12 Months Ended
	Dec. 31, 2019
New Accounting Pronouncements And Changes In Accounting Principles [Abstract]
Summary of Cumulative Effects of Changes in Consolidated Balance Sheet for Adoption of ASU 2016-02	The cumulative effects of the changes made to the Company’s consolidated balance sheet as of January 1, 2019 for the adoption of ASU 2016-02 were as follows: Balance as of December 31, 2018 Adjustments due to adoption of ASU 2016-02 Balance as of January 1, 2019 Other current assets $ 54,363 $ (74 ) $ 54,289 Assets held for sale 69,699 4,127 73,826 Operating lease right-of-use assets — 13,019 13,019 Liabilities held for sale 13,062 4,136 17,198 Deferred income tax liabilities 1,177 114 1,291 Non-current lease liabilities — 12,561 12,561 Accumulated earnings 363,965 261 364,226

Acquisitions and Divestitures (

Acquisitions and Divestitures (Tables)	12 Months Ended
	Dec. 31, 2019
CSZ-IC and GPT
Business Acquisition [Line Items]
Summary of Assets and Liabilities of Disposal Group Classified as Held for Sale	The assets and liabilities of the disposal group classified as held for sale as of December 31, 2018 were as follows: Accounts receivable, less allowance of $96 $ 10,868 Inventory, net 13,925 Prepaid expenses and other assets 263 Property and equipment, net 29,459 Goodwill 6,844 Other intangible assets, net 6,326 Deferred income tax assets 4,204 Other non-current assets — Impairment loss (2,190 ) Total assets for sale 69,699 Accounts payable 2,614 Accrued liabilities 10,448 Total liabilities for sale $ 13,062
Stihler Electronic GmbH
Business Acquisition [Line Items]
Summary of Purchase Price Allocation	The purchase price and related allocation to the acquired net assets of Stihler, based on their estimated fair values as of the acquisition date, are shown below: Purchase price, cash consideration, net of cash acquired $ 14,823 Purchase price, fair value of contingent consideration 653 Total purchase price, net of cash acquired 15,476 Accounts receivable 883 Inventory 1,698 Prepaid expenses and other assets 241 Operating lease right-of-use assets 263 Property and equipment 260 Other intangible assets 4,380 Goodwill 9,816 Assumed liabilities (2,065 ) Net assets acquired $ 15,476
Etratech Inc.
Business Acquisition [Line Items]
Supplemental Pro Forma Information	The unaudited pro forma combined historical results including the amounts of Etratech revenue and earnings that would have been included in the Company’s consolidated statements of income had the acquisition date been January 1, 2017 is as follows: Year Ended December 31, 2017 Product revenues $ 1,032,273 Net income $ 35,911 Basic earnings per share $ 0.98 Diluted earnings per share $ 0.98

Restructuring (Tables)

Restructuring (Tables)	12 Months Ended
	Dec. 31, 2019
Restructuring And Related Activities [Abstract]
Summary of Restructuring Expense by Reportable Segment	Restructuring expense by reporting segment for the years ended December 31, 2019, 2018 and 2017 was as follows: Year Ended December 31, 2019 2018 2017 Automotive $ 9,353 $ 5,548 $ — Industrial 1,838 5,607 — Reconciling items 1,728 3,617 — Total $ 12,919 $ 14,772 $ —
Summary of Restructuring Activity for All Restructuring Initiatives	The following table summarizes restructuring activity for all restructuring initiatives for the years ended December 31, 2019 and 2018: Employee Separation Costs Accelerated Depreciation and Asset Impairment Charges Other Related Costs Total Balance at December 31, 2017 $ — $ — $ — $ — Additions, charged to restructuring expenses 8,449 2,507 3,816 14,772 Cash payments (6,346 ) — (3,348 ) (9,694 ) Non-cash utilization — (2,507 ) — (2,507 ) Reclassification to lease liability — — — — Currency translation (24 ) — — (24 ) Balance at December 31, 2018 2,079 — 468 2,547 Additions, charged to restructuring expenses 8,056 2,512 2,351 12,919 Cash payments (4,118 ) — (2,636 ) (6,754 ) Non-cash utilization — (2,512 ) — (2,512 ) Reclassification to lease liability — — (112 ) (112 ) Currency translation (23 ) — — (23 ) Balance at December 31, 2019 $ 5,994 $ — $ 71 $ 6,065

Earnings Per Share (Tables)

Earnings Per Share (Tables)	12 Months Ended
	Dec. 31, 2019
Earnings Per Share [Abstract]
Basic and Diluted Shares of Consolidated Statements of Income	The following summarizes the shares included in the dilutive shares as disclosed in the consolidated statements of income: Year Ended December 31, 2019 2018 2017 Weighted average number of shares for calculation of basic EPS – Common Stock 33,120,076 35,920,782 36,720,749 Stock options, restricted stock awards and restricted stock units under equity incentive plans 177,513 256,362 92,970 Weighted average number of shares for calculation of diluted EPS – Common Stock 33,297,589 36,177,144 36,813,719
Common Stock Issuable upon Exercise of Certain Stock Options	The accompanying table represents Common Stock issuable upon the exercise of certain stock options and that have been excluded from the diluted earnings calculation because the effect of their inclusion would be anti-dilutive. Year Ended December 31, 2019 2018 2017 Stock options outstanding for equity incentive plans 214,000 898,250 2,055,784

Segment Reporting (Tables)

Segment Reporting (Tables)	12 Months Ended
	Dec. 31, 2019
Segment Reporting [Abstract]
Segment Information About Reported Product Revenues and Operating Income	The tables below present segment information about the reported product revenues and operating income of the Company for years ended December 31, 2019, 2018 and 2017. With the exception of goodwill, asset information by segment is not reported since the Company does not manage assets at a segment level. Automotive Industrial Reconciling Items Consolidated Total 2019: Product revenues $ 920,225 $ 51,459 $ — $ 971,684 Depreciation and amortization 40,765 1,779 1,702 44,246 Operating income (loss) 149,514 (14,043 ) (51,211 ) 84,260 2018: Product revenues $ 957,824 $ 90,681 $ — $ 1,048,505 Depreciation and amortization 43,621 4,384 2,633 50,638 Operating income (loss) 152,051 (22,530 ) (56,733 ) 72,788 2017: Product revenues $ 886,600 $ 107,391 $ — $ 993,991 Depreciation and amortization 36,801 5,399 2,772 44,972 Operating income (loss) 166,378 (14,751 ) (54,529 ) 97,098
Segment Information About Reported Segment Product Revenues by Product Category	Automotive and Industrial segment product revenues by product category for each of the years ended December 31, 2019, 2018 and 2017 are as follows: 2019 2018 2017 Climate Control Seat (CCS) $ 359,355 $ 373,945 $ 387,961 Seat Heaters 284,174 305,337 307,308 Automotive Cables 88,031 98,931 92,092 Steering Wheel Heaters 65,426 69,845 62,125 Electronics 47,542 56,783 8,816 Battery Thermal Management (BTM) 41,498 28,472 10,046 Other Automotive 34,199 24,511 18,252 Subtotal Automotive 920,225 957,824 886,600 Medical 36,860 30,108 30,375 GPT 11,181 19,520 32,282 CSZ-IC 3,418 41,053 44,734 Subtotal Industrial 51,459 90,681 107,391 Total Company $ 971,684 $ 1,048,505 $ 993,991
Product Revenues Information by Geographic Area	Revenue (based on shipment destination) by geographic area for each of the years ended December 31, 2019, 2018 and 2017 is as follows: 2019 2018 2017 United States $ 440,316 $ 488,926 $ 454,669 Germany 81,315 88,366 71,768 Japan 76,197 62,633 57,467 China 71,461 93,628 93,645 South Korea 63,339 58,717 64,715 Czech Republic 38,888 42,665 38,828 Canada 37,804 44,500 46,368 United Kingdom 31,357 37,533 36,033 Romania 26,213 22,435 18,050 Other 104,794 109,102 112,448 Total Non-U.S. 531,368 559,579 539,322 Total Company $ 971,684 $ 1,048,505 $ 993,991
Percentage of Total Product Revenues Generated from Customers	The table below lists the percentage of total product revenues generated from sales to customers which contributed 10% or more to the Company’s total consolidated product revenue: 2019 2018 2017 Lear 16 % 17 % 20 % Adient 15 % 16 % 18 %
Schedule of Property and Equipment, Net by Geographic Area	Property and equipment, net, for each of the geographic areas in which the Company operates is as follows: December 31, 2019 2018 Property and equipment, net Macedonia $ 38,989 $ 39,664 China 23,721 26,108 Vietnam 21,452 20,768 United States 21,280 24,122 Mexico 19,982 26,119 Ukraine 11,727 10,670 Germany 10,515 9,874 Hungary 6,803 7,546 Other 6,136 6,509 Total $ 160,605 $ 171,380

Revenue Recognition (Tables)

Revenue Recognition (Tables)	12 Months Ended
	Dec. 31, 2019
Revenue Recognition And Deferred Revenue [Abstract]
Schedule of Unearned Revenue by Segment	Unearned revenue by segment was as follows: December 31, 2019 December 31, 2018 Automotive $ 579 $ 1,597 Industrial — — Total $ 579 $ 1,597
Schedule of Changes in Unearned Revenue	Changes in unearned revenue for the year ended December 31, 2019 were as follows: Balance, beginning of period $ 1,597 Additions to unearned revenue 234 Reclassified to revenue (1,238 ) Currency impacts (14 ) Balance, end of period $ 579

Income Taxes (Tables)

Income Taxes (Tables)	12 Months Ended
	Dec. 31, 2019
Income Tax Disclosure [Abstract]
Deferred Tax Assets and Deferred Tax Liabilities	The deferred tax assets and deferred tax liabilities and related valuation allowance were comprised of the following: December 31, 2019 2018 Deferred tax assets: Net operating losses $ 17,881 $ 7,666 Intangible assets 33,609 42,853 Research and development credits 9,752 8,211 Depreciation 7,223 6,321 Valuation reserves and accrued liabilities 7,196 4,849 Foreign tax credit 262 376 Stock compensation 3,485 4,128 Inventory 1,284 1,069 Patents 134 150 Defined benefit obligation 2,027 1,796 Other credits 11,491 3,701 Other $ 114 89 Total deferred tax asset 94,458 81,209 Valuation allowance (28,763 ) (9,977 ) Deferred tax liabilities: Unrealized foreign currency exchange gains (674 ) (554 ) Undistributed profits of subsidiary (4,629 ) (4,352 ) Property and equipment (3,366 ) (2,896 ) Other (733 ) (583 ) Total deferred tax liability (9,402 ) (8,385 ) Net deferred tax asset $ 56,293 $ 62,847
Reconciliations Between Statutory Federal Income Tax Rate and Effective Rate	Reconciliations between the statutory Federal income tax rate and the effective rate of income tax expense for each of the three years in the period ended December 31, 2019 are as follows: Year Ended December 31, 2019 2018 2017 Statutory Federal income tax rate 21.0 % 21.0 % 34.0 % Increase (decrease) resulting from: Change in Valuation Allowance 30.7 % (6.6 )% 10.6 % Effect of different tax rates of foreign jurisdictions (24.8 )% (6.6 )% (20.8 )% US Tax Reform Items 4.3 % 10.8 % 29.1 % Research and Development Credits (2.3 )% (2.5 )% (4.6 )% Non-deductible expenses 2.1 % 3.4 % 2.4 % Foreign, state and local tax, net of Federal benefit 1.7 % 1.8 % 0.8 % Tax effects of intercompany transfers 1.5 % 0.8 % (5.0 )% Undistributed profit of subsidiaries 1.2 % 1.2 % 5.8 % Other 1.2 % 4.6 % (1.0 )% Stock Compensation Expense 0.0 % 0.0 % (2.2 )% Effective Rate 36.6 % 27.9 % 49.1 %
Net Operating Loss Carryforwards	The Company has Net Operating Loss (“NOL”) carryforwards as follows: Jurisdiction Amount as of December 31, 2019 Years of Expiration U.S. Federal and state income tax $ 85,828 2020-2039 Foreign $ 13,153 2020-2024 Foreign $ 109,665 Never
Earnings Before Income Taxes	The earnings before income taxes and our tax provision are comprised of the following: Year Ended December 31, 2019 2018 2017 Income (loss) before income taxes: Domestic $ 74,531 $ 10,092 $ 1,258 Foreign (15,380 ) 48,027 67,997 Total income before income taxes $ 59,151 $ 58,119 $ 69,255
Provision for Income Taxes	Year Ended December 31, 2019 2018 2017 Current income tax expense (benefit): Federal $ 262 $ 340 $ 4,140 State and local 94 (71 ) 150 Foreign 17,672 9,224 24,672 Total current income tax expense 18,028 9,493 28,962 Deferred income tax expense (benefit): Federal (2,490 ) (1,422 ) 15,207 State and local (1 ) 20 2,308 Foreign 6,108 8,129 (12,449 ) Total deferred income tax expense 3,617 6,727 5,066 Total tax expense $ 21,645 $ 16,220 $ 34,028
Reconciliation of Unrecognized Tax Benefits	The reconciliation of the beginning and ending amount of unrecognized tax benefits is as follows: Year Ended December 31, 2019 2018 2017 Balance at beginning of year $ 2,819 $ 3,812 $ 3,877 Additions based on tax position related to current year 661 221 1,758 Additions based on tax position related to prior year 352 423 (105 ) Reductions from settlements and statute of limitation expiration — (1,469 ) (2,247 ) Effect of foreign currency translation (37 ) (168 ) 529 Balance at end of year $ 3,795 $ 2,819 $ 3,812

Pension and Other Post Retire_2

Pension and Other Post Retirement Benefit Plans (Tables)	12 Months Ended
	Dec. 31, 2019
Compensation And Retirement Disclosure [Abstract]
Components of Net Periodic Benefit Cost for Company's Defined Benefit Plans	The components of net periodic benefit cost for the Company’s defined benefit plans for the years ended December 31, 2019 , 2018 and 201 7 were as follows: U.S. Plan German Plan Year Ended December 31, Year Ended December 31, 2019 2018 2017 2019 2018 2017 Net periodic benefit cost: Service cost $ — $ — $ 101 $ — $ — $ — Interest cost 127 114 111 147 147 130 Expected return on plan assets — — — (126 ) (130 ) (121 ) Amortization of prior service cost and actuarial loss — — 509 72 73 78 Net periodic benefit cost $ 127 $ 114 $ 721 $ 93 $ 90 $ 87 Assumptions: Discount rate 3.65 % 2.95 % 3.25 % 1.06 % 2.04 % 1.93 % Long-term return on assets N/A N/A N/A 3.10 % 3.40 % 3.40 %
Reconciliation of Change in Benefit Obligation, Change in Plan Assets and Balance Sheet Classification	A reconciliation of the change in benefit obligation and the change in plan assets for the years ended December 31, 2019 and 2018 is as follows: U.S. Plan German Plan As of December 31, As of December 31, 2019 2018 2019 2018 Change in projected benefit obligation: Balance at beginning of year $ 3,832 $ 4,218 $ 7,529 $ 7,927 Interest cost 127 114 147 147 Paid pension distributions (342 ) (342 ) (285 ) (292 ) Actuarial (gains) losses 254 (158 ) 1,116 114 Exchange rate impact — — (154 ) (367 ) Balance at end of year $ 3,871 $ 3,832 $ 8,353 $ 7,529 Change in plan assets: Balance at beginning of year $ — $ — 3,808 3,891 Actual return on plan assets — — 126 130 Contributions — — 284 292 Paid pension distributions — — (284 ) (292 ) Actuarial losses — — (30 ) (30 ) Exchange rate impact — — (79 ) (183 ) Balance at end of year $ — $ — $ 3,825 $ 3,808 Funded Status (underfunded)/overfunded $ (3,871 ) $ (3,832 ) $ (4,528 ) $ (3,721 ) Balance sheet classification: Other current liabilities (342 ) (342 ) — — Pension benefit obligation (3,529 ) (3,490 ) (4,528 ) (3,721 ) Accumulated other comprehensive loss (pre-tax): Actuarial losses 476 222 3,398 2,372 Assumptions: Discount rate 2.40 % 3.65 % 1.06 % 2.04 %
Summary of Pre-tax Amounts in AOCI Expected to Be Recognized in Net Periodic Benefit Cost	Pre-tax amounts included in AOCI that are expected to be recognized in net periodic benefit cost during the year ended December 31, 2020 are as follows: U.S Plan German Plan Actuarial losses $ 7 $ 122
Summary of Accumulated Benefit Obligations	The accumulated benefit obligations were as follows: U.S. Plan German Plan As of December 31, As of December 31, 2019 2018 2019 2018 Accumulated benefit obligation $ 3,871 $ 3,832 $ 8,529 $ 7,894
Schedule of Future Expected Pension Payments	The schedule of future expected pension payments is as follows: Projected Pension Benefit Payments Year U.S Plan German Plan 2020 $ 342 $ 289 2021 342 287 2022 342 283 2023 342 293 2024 342 287 2025-2029 1,710 2,839 Total $ 3,420 $ 4,278

Goodwill and Other Intangibles

Goodwill and Other Intangibles (Tables)	12 Months Ended
	Dec. 31, 2019
Goodwill And Intangible Assets Disclosure [Abstract]
Summary of Changes in the Carrying Amount of Goodwill, By Reportable Segment	Changes in the carrying amount of goodwill, by reportable segment, for the years ended December 31, 2019 and 2018 were as follows: Automotive Industrial Total December 31, 2017 $ 38,912 $ 30,773 $ 69,685 Reclassifications to assets held for sale — (6,844 ) (6,844 ) Impairment of goodwill (a) — (6,151 ) (6,151 ) Exchange rate impact (1,379 ) — (1,379 ) December 31, 2018 $ 37,533 $ 17,778 $ 55,311 Stihler acquisition — 9,816 9,816 Exchange rate impact (595 ) 40 (555 ) December 31, 2019 $ 36,938 $ 27,634 $ 64,572 a) See Note 4, “Acquisitions and Divestitures” for a description of the impairment of goodwill.
Summary of Other Intangible Assets and Accumulated Amortization Balances	Other intangible assets and accumulated amortization balances as of December 31, 2019 and 2018 were as follows: Gross Carrying Value Accumulated Amortization Net Carrying Value Definite-lived: Customer relationships $ 89,208 $ (50,687 ) $ 38,521 Technology 25,106 (19,866 ) 5,240 Product development costs 19,911 (18,559 ) 1,352 Indefinite-lived: Tradenames 4,670 — 4,670 Balance as of December 31, 2019 $ 138,895 $ (89,112 ) $ 49,783 Definite-lived: Customer relationships $ 87,316 $ (44,269 ) $ 43,047 Technology 25,110 (18,616 ) 6,494 Product development costs 20,487 (18,313 ) 2,174 Indefinite-lived: Tradenames 4,670 — 4,670 Balance as of December 31, 2018 $ 137,583 $ (81,198 ) $ 56,385
Summary of Estimate of Other Intangible Asset Amortization	An estimate of other intangible asset amortization by year, is as follows: 2020 $ 8,644 2021 7,700 2022 7,225 2023 4,082 2024 3,033

Details of Certain Financial _2

Details of Certain Financial Statement Components (Tables)	12 Months Ended
	Dec. 31, 2019
Financial Statement Components [Abstract]
Details of Certain Financial Statement Components	December 31, 2019 2018 Inventory: Raw materials, net of reserve $ 61,323 $ 61,679 Work in process, net of reserve 7,444 5,939 Finished goods, net of reserve 49,712 44,917 Total inventory, net $ 118,479 $ 112,535 Other current assets: Income tax and other tax receivables $ 17,057 $ 28,887 Notes receivable 9,963 9,837 Prepaid expenses 7,022 6,962 Billable tooling 5,194 6,475 Short-term derivative financial instruments 1,242 92 Other 2,248 2,110 Total other current assets $ 42,726 $ 54,363 Property and equipment: Buildings and improvements $ 90,675 $ 88,950 Plant and equipment 137,813 125,487 Information technology 27,697 26,381 Production tooling 19,906 15,526 Leasehold improvements 11,116 10,320 Construction in progress $ 2,856 $ 3,421 Total property and equipment 290,063 270,085 Less: Accumulated depreciation (129,458 ) (98,705 ) Total property and equipment, net $ 160,605 $ 171,380 Other current liabilities: Accrued employee liabilities $ 26,019 $ 25,449 Liabilities from discounts and rebates 16,593 16,907 Income and other taxes payable 3,693 6,468 Restructuring 6,065 2,547 Accrued warranty 4,596 4,514 Other 9,617 9,923 Total other current liabilities $ 66,583 $ 65,808

Debt (Tables)

Debt (Tables)	12 Months Ended
	Dec. 31, 2019
Debt Disclosure [Abstract]
Summary of Company's Debt	The following table summarizes the Company’s debt as of December 31, 2019 and 2018. December 31, 2019 2018 Interest Rate Principal Balance Interest Rate Principal Balance Amended Credit Agreement: U.S. Revolving Note (U.S. Dollar Denominations) 3.05 % $ 50,000 4.02 % $ 122,000 U.S. Revolving Note (Euro Denominations) 1.25 % 21,874 1.50 % 5,727 DEG Vietnam Loan 5.21 % 8,750 5.21 % 11,250 DEG China Loan — — 4.25 % 913 Total debt 80,624 139,890 Current maturities (2,500 ) (3,413 ) Long-term debt, less current maturities $ 78,124 $ 136,477
Principal Maturities of Debt	The scheduled principal maturities of our debt as of December 31, 2019 is as follows: Year U.S. Revolving Note DEG Vietnam Note Total 2020 $ — $ 2,500 $ 2,500 2021 — 2,500 2,500 2022 — 2,500 2,500 2023 — 1,250 1,250 2024 71,874 — 71,874 Total $ 71,874 $ 8,750 $ 80,624

Financial Instruments (Tables)

Financial Instruments (Tables)	12 Months Ended
	Dec. 31, 2019
Derivative Instruments And Hedging Activities Disclosure [Abstract]
Reconciliation of Cash and Cash Equivalents and Restricted Cash	A reconciliation of cash and cash equivalents on the consolidated balance sheets to cash, cash equivalents and restricted cash presented on the consolidated statements of cash flows is as follows: As of December 31, 2019 2018 Cash and cash equivalents presented in the consolidated balance sheets $ 50,443 $ 39,620 Restricted cash $ 2,505 $ — Cash, cash equivalents and restricted cash presented in the consolidated statements of cash flows $ 52,948 $ 39,620
Information Related to Recurring Fair Value Measurement of Derivative Financial Instruments in the Consolidated Balance Sheet	Information related to the recurring fair value measurement of derivative financial instruments in the consolidated balance sheet as of December 31, 2019 is as follows: Asset Derivatives Liability Derivatives Hedge Designation Fair Value Hierarchy Balance Sheet Location Fair Value Balance Sheet Location Fair Value Net Asset/ (Liabilities) Foreign currency derivatives Cash flow hedge Level 2 Other current assets $ 1,242 Other current liabilities $ — $ 1,242 Information related to the recurring fair value measurement of derivative financial instruments in the consolidated balance sheet as of December 31, 2018 is as follows: Asset Derivatives Liability Derivatives Hedge Designation Fair Value Hierarchy Balance Sheet Location Fair Value Balance Sheet Location Fair Value Net Asset/ (Liabilities) Foreign currency derivatives Cash flow hedge Level 2 Other current assets $ 92 Other current liabilities $ — $ 92
Information Related to Effect of Derivative Instrument's on the Consolidated Statements of Income	Information related to the effect of derivative instrument`s on the consolidated statements of income is as follows: Year Ended December 31, Location 2019 2018 Foreign currency derivatives Cost of sales $ 1,976 $ (444 ) Selling, general and administrative — 75 Other comprehensive income 1,151 1,096 Foreign currency gain (loss) (46 ) 50 Total foreign currency derivatives 3,081 777 Commodity derivatives Cost of sales — 145 Other comprehensive income — (218 ) Total commodity derivatives $ — $ (73 )

Reclassifications Out of Accu_2

Reclassifications Out of Accumulated Other Comprehensive Income (Loss) (Tables)	12 Months Ended
	Dec. 31, 2019
Equity [Abstract]
Schedule of Reclassification Adjustments and Other Activities Impacting Accumulated Other Comprehensive Income (Loss)	Reclassification adjustments and other activities impacting accumulated other comprehensive income (loss) during the years ended December 31, 2019, December 31, 2018 and December 31, 2017 are as follows: Defined Benefit Pension Plans Foreign Currency Translation Adjustments Foreign Currency Hedge Derivatives Total Balance at December 31, 2018 $ (2,339 ) $ (37,157 ) $ (4 ) $ (39,500 ) Other comprehensive income (loss) before reclassifications (1,264 ) (2,415 ) 2,259 $ (1,420 ) Income tax effect of other comprehensive income (loss) before reclassifications 232 (393 ) (493 ) $ (654 ) Amounts reclassified from accumulated other comprehensive income (loss) into net income — — (1,108 ) a $ (1,108 ) Income taxes reclassified into net income — — 241 $ 241 Net current period other comprehensive income (loss) (1,032 ) (2,808 ) 899 (2,941 ) Balance at December 31, 2019 $ (3,371 ) $ (39,965 ) $ 895 $ (42,441 ) (a) The amounts reclassified from accumulated other comprehensive income (loss) are included in cost of sales. See Note 14 for information related to the effect of commodity and foreign currency derivative instrument`s on our consolidated statements of income. Defined Benefit Pension Plans Foreign Currency Translation Adjustments Commodity Hedge Derivatives Foreign Currency Hedge Derivatives Total Balance at December 31, 2017 $ (2,366 ) $ (17,555 ) $ 277 $ (800 ) $ (20,444 ) Cumulative effect of accounting change due to adoption of ASU 2018-02 (49 ) — 9 — (40 ) Other comprehensive income (loss) before reclassifications 18 (19,212 ) — 1,342 (17,852 ) Income tax effect of other comprehensive income (loss) before reclassifications (15 ) (390 ) — (337 ) (742 ) Amounts reclassified from accumulated other comprehensive income (loss) into net income 73 — (218 ) a (246 ) a (391 ) Income taxes reclassified into net income — — (68 ) 37 (31 ) Net current period other comprehensive income (loss) 27 (19,602 ) (277 ) 796 (19,056 ) Balance at December 31, 2018 $ (2,339 ) $ (37,157 ) $ — $ (4 ) $ (39,500 ) (a) The amounts reclassified from accumulated other comprehensive income (loss) are included in cost of sales. See Note 14 for information related to the effect of commodity and foreign currency derivative instrument`s on our consolidated statements of income. Defined Benefit Pension Plans Foreign Currency Translation Adjustments Commodity Hedge Derivatives Foreign Currency Hedge Derivatives Total Balance at December 31, 2016 $ (2,550 ) $ (65,762 ) $ 241 $ (1,020 ) $ (69,091 ) Other comprehensive income (loss) before reclassifications 166 48,059 254 2,123 50,602 Income tax effect of other comprehensive income (loss) before reclassifications (60 ) 148 (93 ) (570 ) (575 ) Amounts reclassified from accumulated other comprehensive income (loss) into net income 78 — (199 ) a (1,822 ) a (1,943 ) Income taxes reclassified into net income — — 74 489 563 Net current period other comprehensive income (loss) 184 48,207 36 220 48,647 Balance at December 31, 2017 $ (2,366 ) $ (17,555 ) $ 277 $ (800 ) $ (20,444 ) (a) The amounts reclassified from accumulated other comprehensive income (loss) are included in cost of sales. See Note 14 for information related to the effect of commodity and foreign currency derivative instrument`s on our consolidated statements of income.

Accounting for Stock Based Co_2

Accounting for Stock Based Compensation (Tables)	12 Months Ended
	Dec. 31, 2019
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Summary of Stock Option Activity	The following table summarizes stock option activity during the three-year period ended December 31, 2019: Options Shares Weighted-Average Exercise Price Weighted-Average Remaining Contractual Term Aggregate Intrinsic Value Outstanding at December 31, 2016 2,103,470 $ 32.72 4.86 $ 12,265 Granted 808,500 37.23 Exercised (202,328 ) 13.62 Forfeited (57,500 ) 42.54 Outstanding at December 31, 2017 2,652,142 $ 35.34 4.76 $ 6,964 Granted — — Exercised (615,358 ) 24.01 Forfeited (383,784 ) 39.59 Outstanding at December 31, 2018 1,653,000 $ 38.53 4.28 $ 3,610 Granted — — Exercised (428,250 ) 38.66 Forfeited (355,750 ) 39.99 Outstanding at December 31, 2019 869,000 $ 37.87 3.51 $ 5,172 Exercisable at December 31, 2017 984,374 $ 29.84 3.44 $ 6,534 Exercisable at December 31, 2018 788,125 $ 38.15 3.71 $ 2,200 Exercisable at December 31, 2019 665,000 $ 38.10 3.23 $ 3,725
Fair Value of Option on Date of Grant	The fair value of each option is estimated on the date of grant using the Black-Scholes option-pricing model in order to measure the compensation cost associated with the award. This model incorporates certain assumptions for inputs including a risk-free interest rate, expected dividend yield of the underlying Common Stock, expected option life and expected volatility in the market value of the underlying Common Stock. The following assumptions were used for options issued in the following periods: 2019 2018 2017 Expected volatility N/A N/A 33% Weighted-average expected volatility N/A N/A 33% Expected lives N/A N/A 3 years Risk-free interest rate N/A N/A 1.49−1.93% Expected dividend yield none none none
Restricted Stock Activity	The following table summarizes restricted stock activity during the three-year period ended December 31, 2019: Unvested Restricted Shares Shares Weighted-Average Grant Date Fair Value Outstanding at December 31, 2016 210,481 $ 39.02 Granted 237,542 37.30 Exercised (165,923 ) 37.99 Forfeited — — Outstanding at December 31, 2017 282,100 $ 38.06 Granted 21,681 35.00 Exercised (130,684 ) 38.62 Forfeited (36,531 ) 37.60 Outstanding at December 31, 2018 136,566 $ 37.16 Granted 19,920 40.16 Exercised (91,566 ) 37.09 Forfeited (30,000 ) 38.05 Outstanding at December 31, 2019 34,920 $ 38.31
SARs Activity	The following table summarizes SARs activity during the three-year period ended December 31, 2019: Stock Appreciation Rights Shares Weighted-Average Exercise Price Weighted-Average Remaining Contractual Term Aggregate Intrinsic Value Outstanding at December 31, 2016 1,244,600 $ 36.11 4.80 $ 3,511 Granted 235,000 38.05 Exercised (94,250 ) 22.21 Forfeited (193,000 ) 32.53 Outstanding at December 31, 2017 1,192,350 $ 38.17 4.36 $ 2,278 Granted — — Exercised (204,250 ) 26.35 Forfeited — — Outstanding at December 31, 2018 988,100 $ 40.61 3.57 $ 2,064 Granted — — Exercised (179,500 ) 32.84 Forfeited (254,350 ) 42.63 Outstanding at December 31, 2019 554,250 $ 39.41 2.84 $ 2,981 Exercisable at December 31, 2017 613,808 $ 37.68 3.72 1,904 Exercisable at December 31, 2018 683,600 $ 41.21 3.09 1,728 Exercisable at December 31, 2019 401,438 $ 39.62 2.46 2,135
RSU
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Restricted Stock Activity	The following table summarizes restricted stock unit activity during the two-year period ended December 31, 2019: Performance-Based Awards Unvested Restricted Stock Units Time Vesting Shares ROIC Target Shares TSR Target Shares Total Outstanding at December 31, 2017 — — — — Granted 86,392 64,785 64,792 215,969 Vested — — — — Forfeited — — — — Outstanding at December 31, 2018 86,392 64,785 64,792 215,969 Granted 107,391 56,380 56,375 220,146 Vested (23,956 ) — — (23,956 ) Forfeited (28,086 ) (26,124 ) (26,128 ) (80,338 ) Outstanding at December 31, 2019 141,741 95,041 95,039 331,821

Leases (Tables)

Leases (Tables)	12 Months Ended
	Dec. 31, 2019
Leases [Abstract]
Components of Lease Expense and Other Information	Components of lease expense for the year ended December 31, 2019 are as follows: Year Ended December 31, 2019 Lease cost: Operating lease cost $ 5,899 Short-term lease cost 3,444 Sublease income (128 ) Total lease cost $ 9,215 Other information related to leases is as follows: Year Ended December 31, 2019 Supplemental cash flow information: Gain on sales and leaseback transactions, net $ 207 Cash paid for amounts included in the measurement of lease liabilities: Operating cash flows from operating leases $ 6,059 Right-of-use lease assets obtained in exchange for lease obligations: Operating leases $ 4,111 December 31, 2019 Weighted-average remaining lease term: Operating leases 4.5 years Weighted-average discount rate: Operating leases 5.46 %
Summary of Operating Leases Under all Non-Cancellable Operating Leases	A summary of operating leases as of December 31, 2019, under all non-cancellable operating leases with terms exceeding one year is as follows: 2020 $ 4,847 2021 2,949 2022 1,602 2023 796 2024 790 2025 or later 1,832 Total future minimum lease payments 12,816 Less: imputed interest (1,479 ) Total $ 11,337
Summary of Maturities of Lease Liabilities Under Previous Lease Accounting	As previously disclosed in our 2018 Annual Report on Form 10-K and under the previous lease accounting, maturities of lease liabilities were as follows as of December 31, 2018: 2019 $ 7,530 2020 5,016 2021 2,468 2022 2,152 2023 1,532 2024 or later 4,021 Total $ 22,719

Commitments and Contingencies (

Commitments and Contingencies (Tables)	12 Months Ended
	Dec. 31, 2019
Commitments And Contingencies Disclosure [Abstract]
Reconciliation of Changes in Accrued Warranty Costs	The following is a reconciliation of the changes in accrued warranty costs: Year Ended December 31, 2019 2018 Balance at beginning of year $ 4,514 $ 5,382 Warranty claims paid (584 ) (905 ) Warranty expense for products shipped during the current period 2,370 2,678 Adjustments to warranty estimates from prior periods (1,660 ) (608 ) Acquisition of business 21 — Reclassification to liabilities held for sale — (1,884 ) Adjustments due to currency translation (65 ) (149 ) Balance at end of year $ 4,596 $ 4,514

Selected Quarterly Informatio_2

Selected Quarterly Information (Unaudited) (Tables)	12 Months Ended
	Dec. 31, 2019
Selected Quarterly Financial Information [Abstract]
Summary of Selected Quarterly Information	Three Months Ended, March 31, 2019 June 30, 2019 September 30, 2019 December 31, 2019 Product revenues $ 257,921 $ 243,326 $ 240,056 $ 230,381 Gross margin 75,307 72,714 74,692 65,622 Net income 8,414 2,751 15,887 10,454 Basic earnings per share $ 0.25 $ 0.08 $ 0.48 $ 0.32 Diluted earnings per share $ 0.25 $ 0.08 $ 0.48 $ 0.32 Three Months Ended, March 31, 2018 June 30, 2018 September 30, 2018 December 31, 2018 Product revenues (a) $ 264,586 $ 266,400 $ 261,504 $ 256,015 Gross margin 81,242 77,092 75,704 70,820 Net income (loss) 12,966 16,659 (355 ) 12,629 Basic earnings (loss) per share $ 0.35 $ 0.46 $ (0.01 ) $ 0.37 Diluted earnings (loss) per share $ 0.35 $ 0.45 $ (0.01 ) $ 0.36 a) Product revenues for 2018 have been adjusted to conform with the current year presentation, related to a reclassification of customer relationship amortization from product revenues to selling, general and administrative expenses. See Note 2, “Significant Accounting Policies” to the consolidated financial statements included in this Report for further details regarding these adjustments.

Summary of Significant Accoun_4

Summary of Significant Accounting Policies - Additional Information (Detail) $ in Thousands	12 Months Ended
	Dec. 31, 2019USD ($)Segment	Dec. 31, 2018USD ($)	Dec. 31, 2017USD ($)
Basis Of Presentation And Accounting Policies [Line Items]
Number of reportable segments | Segment	2
Unearned revenue	$ 579	$ 1,597
capitalized costs to obtain contract	1,893	374
Amortization of capitalized costs into product revenues	1,006
Cash and cash equivalents	50,443	39,620
Depreciation expense	$ 33,639	36,270	$ 32,224
Operating lease, description	The Company has operating leases for office, manufacturing and research and development facilities, as well as land leases for certain manufacturing facilities that are accounted for as operating leases. We also have operating leases for office equipment and automobiles.
Operating lease, existence of option to extend	true
Operating lease, options to extend	Excluding land leases, our leases have remaining lease terms ranging from less than 1 year to 7 years and may include options to extend the lease for an additional term equal to the original term of the lease.
Performance Based Restricted Stock Units
Basis Of Presentation And Accounting Policies [Line Items]
Awards vesting period	3 years
Production Tooling
Basis Of Presentation And Accounting Policies [Line Items]
Reimbursable tooling capitalized within prepaid expenses and other current assets	$ 5,347	$ 6,628
Concentration of Credit Risk | Accounts receivable | Lear
Basis Of Presentation And Accounting Policies [Line Items]
Concentration risk percentage	21.00%	21.00%
Concentration of Credit Risk | Accounts receivable | Adient
Basis Of Presentation And Accounting Policies [Line Items]
Concentration risk percentage	21.00%	18.00%
Concentration of Credit Risk | Accounts receivable | Magna
Basis Of Presentation And Accounting Policies [Line Items]
Concentration risk percentage	7.00%
Concentration of Credit Risk | Accounts receivable | Faurecia
Basis Of Presentation And Accounting Policies [Line Items]
Concentration risk percentage		9.00%
Foreign Jurisdictions
Basis Of Presentation And Accounting Policies [Line Items]
Cash and cash equivalents	$ 35,735	$ 31,976
Industrial Segments
Basis Of Presentation And Accounting Policies [Line Items]
Unearned revenue		5,296
Minimum
Basis Of Presentation And Accounting Policies [Line Items]
Expected period of costs to be realized to recognize assets	1 year
Operating lease, term of contract	1 year
Minimum | Production Tooling
Basis Of Presentation And Accounting Policies [Line Items]
Property plant and equipment, estimated useful life	2 years
Minimum | Ground
Basis Of Presentation And Accounting Policies [Line Items]
Operating lease, term of contract	41 years
Maximum
Basis Of Presentation And Accounting Policies [Line Items]
Ownership interest	20.00%
Original maturities of highly liquid investments	90 days
Operating lease, term of contract	7 years
Maximum | Production Tooling
Basis Of Presentation And Accounting Policies [Line Items]
Property plant and equipment, estimated useful life	10 years
Maximum | Ground
Basis Of Presentation And Accounting Policies [Line Items]
Operating lease, term of contract	43 years
Customer Relationship
Basis Of Presentation And Accounting Policies [Line Items]
Amortization of intangible assets		$ 10,246	$ 8,308

Summary of Significant Accoun_5

Summary of Significant Accounting Policies - Estimated Useful Lives of Property and Equipment (Detail)	12 Months Ended
	Dec. 31, 2019
Leasehold Improvements
Property Plant And Equipment [Line Items]
Property plant and equipment, estimated useful life	Term of lease
Minimum | Buildings and Improvements
Property Plant And Equipment [Line Items]
Property plant and equipment, estimated useful life	2 years
Minimum | Plant and Equipment
Property Plant And Equipment [Line Items]
Property plant and equipment, estimated useful life	1 year
Minimum | Production Tooling
Property Plant And Equipment [Line Items]
Property plant and equipment, estimated useful life	2 years
Minimum | Information Technology
Property Plant And Equipment [Line Items]
Property plant and equipment, estimated useful life	1 year
Maximum | Buildings and Improvements
Property Plant And Equipment [Line Items]
Property plant and equipment, estimated useful life	50 years
Maximum | Plant and Equipment
Property Plant And Equipment [Line Items]
Property plant and equipment, estimated useful life	20 years
Maximum | Production Tooling
Property Plant And Equipment [Line Items]
Property plant and equipment, estimated useful life	10 years
Maximum | Information Technology
Property Plant And Equipment [Line Items]
Property plant and equipment, estimated useful life	10 years

Summary of Significant Accoun_6

Summary of Significant Accounting Policies - Fair Value and Corresponding Useful Lives for Acquired Intangibles Assets (Detail)	12 Months Ended
	Dec. 31, 2019
Customer Relationships | Minimum
Finite Lived Intangible Assets [Line Items]
Acquired intangible assets useful life	6 years
Customer Relationships | Maximum
Finite Lived Intangible Assets [Line Items]
Acquired intangible assets useful life	15 years
Technology | Minimum
Finite Lived Intangible Assets [Line Items]
Acquired intangible assets useful life	4 years
Technology | Maximum
Finite Lived Intangible Assets [Line Items]
Acquired intangible assets useful life	8 years
Product Development Costs | Minimum
Finite Lived Intangible Assets [Line Items]
Acquired intangible assets useful life	1 year
Product Development Costs | Maximum
Finite Lived Intangible Assets [Line Items]
Acquired intangible assets useful life	15 years

New Accounting Pronouncements -

New Accounting Pronouncements - Summary of Cumulative Effects of Changes in Consolidated Balance Sheet for Adoption of ASU 2016-02 (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Jan. 01, 2019	Dec. 31, 2018
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]
Other current assets	$ 42,726		$ 54,363
Assets held for sale			69,699
Operating lease right-of-use assets	11,587
Liabilities held for sale			13,062
Deferred income tax liabilities	1,357		1,177
Non-current lease liabilities	6,751
Accumulated earnings	$ 401,732		$ 363,965
ASU 2016-02
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]
Other current assets		$ 54,289
Assets held for sale		73,826
Operating lease right-of-use assets		13,019
Liabilities held for sale		17,198
Deferred income tax liabilities		1,291
Non-current lease liabilities		12,561
Accumulated earnings		364,226
Adjustments Due to Adoption of ASU 2016-02 | ASU 2016-02
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]
Other current assets		(74)
Assets held for sale		4,127
Operating lease right-of-use assets		13,019
Liabilities held for sale		4,136
Deferred income tax liabilities		114
Non-current lease liabilities		12,561
Accumulated earnings		$ 261

Acquisitions and Divestitures -

Acquisitions and Divestitures - Additional Information (Detail) - USD ($) $ in Thousands	Apr. 01, 2019	Feb. 01, 2019	Nov. 01, 2017	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Business Acquisition [Line Items]
Asset impairment charges				$ 22,793	$ 11,476
Impairment on assets held for sale					2,190
Goodwill impairment charges					6,151
Other intangible impairment charges					3,135
Foreign currency translation adjustments gain (loss)				2,415	19,212	$ (48,059)
GPT and CSZ-IC
Business Acquisition [Line Items]
Asset impairment charges					11,476
Impairment on assets held for sale					2,190
Goodwill impairment charges					6,151
Other intangible impairment charges					$ 3,135
CSZ-IC
Business Acquisition [Line Items]
Total cash proceeds		$ 47,500
Escrow deposit		$ 2,500
Pre-tax gain (loss) on sale of business				4,298
GPT
Business Acquisition [Line Items]
Asset impairment charges				21,206
Impairment on assets held for sale				16,720
Pre-tax gain (loss) on sale of business				(5,885)
Impairment of equity method investment held for sale				4,486
Foreign currency translation adjustments gain (loss)				3,995
Uncollectible amount				1,500
Stihler Electronic GmbH
Business Acquisition [Line Items]
Net assets acquired	$ 15,476
Business combination future contingent consideration milestone payment	653
Acquisition related costs				$ 324
Estimated goodwill, expected tax deductible amount	2,524
Net assets acquired	$ 15,476
Stihler Electronic GmbH | Other intangible assets
Business Acquisition [Line Items]
Estimated useful life	9 years
Etratech Inc.
Business Acquisition [Line Items]
Net assets acquired			$ 65,009
Cash acquired on acquisition			$ 670
Product revenues						8,398
Net loss						$ 510

Acquisitions and Divestitures_2

Acquisitions and Divestitures - Summary of Assets and Liabilities of Disposal Group Classified as Held for Sale (Detail) $ in Thousands	Dec. 31, 2018USD ($)
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Total assets for sale	$ 69,699
Total liabilities for sale	13,062
CSZ-IC and GPT
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Accounts receivable, less allowance of $96	10,868
Inventory, net	13,925
Prepaid expenses and other assets	263
Property and equipment, net	29,459
Goodwill	6,844
Other intangible assets, net	6,326
Deferred income tax assets	4,204
Impairment loss	(2,190)
Total assets for sale	69,699
Accounts payable	2,614
Accrued liabilities	10,448
Total liabilities for sale	$ 13,062

Acquisitions and Divestitures_3

Acquisitions and Divestitures - Summary of Assets and Liabilities of Disposal Group Classified as Held for Sale (Detail) (Parenthetical) $ in Thousands	Dec. 31, 2018USD ($)
CSZ-IC and GPT
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Allowance for accounts receivable	$ 96

Acquisitions and Divestitures_4

Acquisitions and Divestitures - Summary of Purchase Price Allocation (Detail) - USD ($) $ in Thousands	Apr. 01, 2019	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Business Acquisition [Line Items]
Purchase price, cash consideration, net of cash acquired		$ 14,823	$ 15	$ 66,994
Goodwill		$ 64,572	$ 55,311
Stihler Electronic GmbH
Business Acquisition [Line Items]
Purchase price, cash consideration, net of cash acquired	$ 14,823
Purchase price, fair value of contingent consideration	653
Total purchase price, net of cash acquired	15,476
Accounts receivable	883
Inventory	1,698
Prepaid expenses and other assets	241
Operating lease right-of-use assets	263
Property and equipment	260
Other intangible assets	4,380
Goodwill	9,816
Assumed liabilities	(2,065)
Net assets acquired	$ 15,476

Acquisitions and Divestitures_5

Acquisitions and Divestitures - Supplemental Pro Forma Information (Detail) - Etratech Inc. $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2017USD ($)$ / shares
Business Acquisition [Line Items]
Product revenues | $	$ 1,032,273
Net income | $	$ 35,911
Basic earnings per share | $ / shares	$ 0.98
Diluted earnings per share | $ / shares	$ 0.98

Restructuring - Additional Info

Restructuring - Additional Information (Detail)	12 Months Ended
	Dec. 31, 2019USD ($)	Dec. 31, 2018USD ($)Facility
Restructuring Cost And Reserve [Line Items]
Restructuring expenses	$ 12,919,000	$ 14,772,000
Asset impairment loss	22,793,000	11,476,000
Manufacturing Footprint Rationalization | Minimum
Restructuring Cost And Reserve [Line Items]
Restructuring and related cost expected total cost	20,000,000
Manufacturing Footprint Rationalization | Maximum
Restructuring Cost And Reserve [Line Items]
Restructuring and related cost expected total cost	24,000,000
Advanced Research and Development Rationalization and Site Consolidation
Restructuring Cost And Reserve [Line Items]
Restructuring expenses	4,669,000
Asset impairment loss	425,000
GPT and CSZ-IC
Restructuring Cost And Reserve [Line Items]
Restructuring expenses	2,303,000
Employee Separation Costs
Restructuring Cost And Reserve [Line Items]
Restructuring expenses	8,056,000	8,449,000
Employee Separation Costs | Manufacturing Footprint Rationalization
Restructuring Cost And Reserve [Line Items]
Restructuring expenses	4,863,000
Restructuring reserve accelerated depreciation and fixed asset impairment	2,087,000
Employee Separation Costs | Manufacturing Footprint Rationalization | Minimum
Restructuring Cost And Reserve [Line Items]
Restructuring and related cost expected total cost	9,000,000
Employee Separation Costs | Manufacturing Footprint Rationalization | Maximum
Restructuring Cost And Reserve [Line Items]
Restructuring and related cost expected total cost	11,000,000
Employee Separation Costs | Other Restructuring Activities
Restructuring Cost And Reserve [Line Items]
Restructuring expenses	2,942,000	6,598,000
Employee Separation Costs | Advanced Research and Development Rationalization and Site Consolidation
Restructuring Cost And Reserve [Line Items]
Restructuring expenses		1,094,000
Employee Separation Costs | GPT and CSZ-IC
Restructuring Cost And Reserve [Line Items]
Restructuring expenses	251,000	757,000
Cash Expenditures | Manufacturing Footprint Rationalization | Minimum
Restructuring Cost And Reserve [Line Items]
Restructuring and related cost expected total cost	17,000,000
Cash Expenditures | Manufacturing Footprint Rationalization | Maximum
Restructuring Cost And Reserve [Line Items]
Restructuring and related cost expected total cost	21,000,000
Restructuring Capital Expenditures | Manufacturing Footprint Rationalization | Minimum
Restructuring Cost And Reserve [Line Items]
Restructuring and related cost expected total cost	4,500,000
Restructuring Capital Expenditures | Manufacturing Footprint Rationalization | Maximum
Restructuring Cost And Reserve [Line Items]
Restructuring and related cost expected total cost	5,500,000
Accelerated Depreciation and Impairment
Restructuring Cost And Reserve [Line Items]
Restructuring expenses	2,512,000	2,507,000
Accelerated Depreciation and Impairment | Manufacturing Footprint Rationalization
Restructuring Cost And Reserve [Line Items]
Restructuring and related cost expected total cost	3,000,000
Other Restructuring
Restructuring Cost And Reserve [Line Items]
Restructuring expenses	2,351,000	3,816,000
Other Restructuring | Manufacturing Footprint Rationalization | Minimum
Restructuring Cost And Reserve [Line Items]
Restructuring and related cost expected total cost	3,500,000
Other Restructuring | Manufacturing Footprint Rationalization | Maximum
Restructuring Cost And Reserve [Line Items]
Restructuring and related cost expected total cost	4,500,000
Other Restructuring | Other Restructuring Activities
Restructuring Cost And Reserve [Line Items]
Restructuring expenses	1,360,000	2,869,000
Other Restructuring | Advanced Research and Development Rationalization and Site Consolidation
Restructuring Cost And Reserve [Line Items]
Restructuring expenses		643,000
Other Restructuring | GPT and CSZ-IC
Restructuring Cost And Reserve [Line Items]
Restructuring expenses	$ 991,000	304,000
Loss on the Sale of Battery Management Systems | Advanced Research and Development Rationalization and Site Consolidation
Restructuring Cost And Reserve [Line Items]
Restructuring expenses		1,107,000
Asset Disposal Costs | Advanced Research and Development Rationalization and Site Consolidation
Restructuring Cost And Reserve [Line Items]
Restructuring expenses		$ 1,400,000
Facility Closing | Advanced Research and Development Rationalization and Site Consolidation
Restructuring Cost And Reserve [Line Items]
Number of leased facilities vacated | Facility		2

Restructuring - Summary of Rest

Restructuring - Summary of Restructuring Expense by Reportable Segment (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Restructuring Cost And Reserve [Line Items]
Restructuring expenses	$ 12,919	$ 14,772
Operating Segments | Automotive Segments
Restructuring Cost And Reserve [Line Items]
Restructuring expenses	9,353	5,548
Operating Segments | Industrial Segments
Restructuring Cost And Reserve [Line Items]
Restructuring expenses	1,838	5,607
Reconciling Items
Restructuring Cost And Reserve [Line Items]
Restructuring expenses	$ 1,728	$ 3,617

Restructuring - Summary of Re_2

Restructuring - Summary of Restructuring Activity for All Restructuring Initiatives (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Restructuring Cost And Reserve [Line Items]
Balance, beginning of period	$ 2,547
Additions, charged to restructuring expenses	12,919	$ 14,772
Cash payments	(6,754)	(9,694)
Non-cash utilization	(2,512)	(2,507)
Reclassification to lease liability	(112)
Currency translation	(23)	(24)
Balance, end of period	6,065	2,547
Employee Separation Costs
Restructuring Cost And Reserve [Line Items]
Balance, beginning of period	2,079
Additions, charged to restructuring expenses	8,056	8,449
Cash payments	(4,118)	(6,346)
Currency translation	(23)	(24)
Balance, end of period	5,994	2,079
Accelerated Depreciation and Impairment
Restructuring Cost And Reserve [Line Items]
Additions, charged to restructuring expenses	2,512	2,507
Non-cash utilization	(2,512)	(2,507)
Other Restructuring
Restructuring Cost And Reserve [Line Items]
Balance, beginning of period	468
Additions, charged to restructuring expenses	2,351	3,816
Cash payments	(2,636)	(3,348)
Reclassification to lease liability	(112)
Balance, end of period	$ 71	$ 468

Earnings Per Share (Detail)

Earnings Per Share (Detail) - shares	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]
Weighted average number of shares for calculation of basic EPS – Common Stock	33,120,076	35,920,782	36,720,749
Stock options, restricted stock awards and restricted stock units under equity incentive plans	177,513	256,362	92,970
Weighted average number of shares for calculation of diluted EPS – Common Stock	33,297,589	36,177,144	36,813,719
Stock options outstanding for equity incentive plans
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]
Stock options outstanding for equity incentive plans	214,000	898,250	2,055,784

Segment Reporting - Segment Inf

Segment Reporting - Segment Information About Reported Product Revenues and Operating Income (Detail) - USD ($) $ in Thousands	3 Months Ended												12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018		Sep. 30, 2018		Jun. 30, 2018		Mar. 31, 2018		Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Segment Reporting Information [Line Items]
Product revenues	$ 230,381	$ 240,056	$ 243,326	$ 257,921	$ 256,015	[1]	$ 261,504	[1]	$ 266,400	[1]	$ 264,586	[1]	$ 971,684	$ 1,048,505	$ 993,991
Type of Revenue [Extensible List]	us-gaap:ProductMember	us-gaap:ProductMember	us-gaap:ProductMember	us-gaap:ProductMember	us-gaap:ProductMember		us-gaap:ProductMember		us-gaap:ProductMember		us-gaap:ProductMember		us-gaap:ProductMember	us-gaap:ProductMember	us-gaap:ProductMember
Depreciation and amortization													$ 44,246	$ 50,638	$ 44,972
Operating income (loss)													84,260	72,788	97,098
Automotive Segments
Segment Reporting Information [Line Items]
Product revenues													920,225	957,824	886,600
Industrial Segments
Segment Reporting Information [Line Items]
Product revenues													51,459	90,681	107,391
Operating Segments | Automotive Segments
Segment Reporting Information [Line Items]
Product revenues													$ 920,225	$ 957,824	$ 886,600
Type of Revenue [Extensible List]													us-gaap:ProductMember	us-gaap:ProductMember	us-gaap:ProductMember
Depreciation and amortization													$ 40,765	$ 43,621	$ 36,801
Operating income (loss)													149,514	152,051	166,378
Operating Segments | Industrial Segments
Segment Reporting Information [Line Items]
Product revenues													$ 51,459	$ 90,681	$ 107,391
Type of Revenue [Extensible List]													us-gaap:ProductMember	us-gaap:ProductMember	us-gaap:ProductMember
Depreciation and amortization													$ 1,779	$ 4,384	$ 5,399
Operating income (loss)													$ (14,043)	$ (22,530)	$ (14,751)
Reconciling Items
Segment Reporting Information [Line Items]
Type of Revenue [Extensible List]													us-gaap:ProductMember	us-gaap:ProductMember	us-gaap:ProductMember
Depreciation and amortization													$ 1,702	$ 2,633	$ 2,772
Operating income (loss)													$ (51,211)	$ (56,733)	$ (54,529)
[1]	Product revenues for 2018 have been adjusted to conform with the current year presentation, related to a reclassification of customer relationship amortization from product revenues to selling, general and administrative expenses.  See Note 2, “Significant Accounting Policies” to the consolidated financial statements included in this Report for further details regarding these adjustments.

Segment Reporting - Segment I_2

Segment Reporting - Segment Information About Reported Segment Product Revenues by Product Category (Detail) - USD ($) $ in Thousands	3 Months Ended												12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	[1]	Sep. 30, 2018	[1]	Jun. 30, 2018	[1]	Mar. 31, 2018	[1]	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Segment Reporting Information [Line Items]
Product revenues	$ 230,381	$ 240,056	$ 243,326	$ 257,921	$ 256,015		$ 261,504		$ 266,400		$ 264,586		$ 971,684	$ 1,048,505	$ 993,991
Automotive Segments
Segment Reporting Information [Line Items]
Product revenues													920,225	957,824	886,600
Automotive Segments | Climate Control Seat (CCS)
Segment Reporting Information [Line Items]
Product revenues													359,355	373,945	387,961
Automotive Segments | Seat Heaters
Segment Reporting Information [Line Items]
Product revenues													284,174	305,337	307,308
Automotive Segments | Automotive Cables
Segment Reporting Information [Line Items]
Product revenues													88,031	98,931	92,092
Automotive Segments | Steering Wheel Heaters
Segment Reporting Information [Line Items]
Product revenues													65,426	69,845	62,125
Automotive Segments | Electronics
Segment Reporting Information [Line Items]
Product revenues													47,542	56,783	8,816
Automotive Segments | Battery Thermal Management (BTM)
Segment Reporting Information [Line Items]
Product revenues													41,498	28,472	10,046
Automotive Segments | Other Automotive
Segment Reporting Information [Line Items]
Product revenues													34,199	24,511	18,252
Industrial Segments
Segment Reporting Information [Line Items]
Product revenues													51,459	90,681	107,391
Industrial Segments | Medical
Segment Reporting Information [Line Items]
Product revenues													36,860	30,108	30,375
Industrial Segments | GPT
Segment Reporting Information [Line Items]
Product revenues													11,181	19,520	32,282
Industrial Segments | CSZ-IC
Segment Reporting Information [Line Items]
Product revenues													$ 3,418	$ 41,053	$ 44,734
[1]	Product revenues for 2018 have been adjusted to conform with the current year presentation, related to a reclassification of customer relationship amortization from product revenues to selling, general and administrative expenses.  See Note 2, “Significant Accounting Policies” to the consolidated financial statements included in this Report for further details regarding these adjustments.

Segment Reporting (Detail)

Segment Reporting (Detail) - USD ($) $ in Thousands

3 Months Ended

12 Months Ended

Dec. 31, 2019

Sep. 30, 2019

Jun. 30, 2019

Mar. 31, 2019

Dec. 31, 2018

Sep. 30, 2018

Jun. 30, 2018

Mar. 31, 2018

Dec. 31, 2019

Dec. 31, 2018

Dec. 31, 2017

Segment Reporting Information [Line Items]

Product revenues

$ 230,381

$ 240,056

$ 243,326

$ 257,921

$ 256,015

[1]

$ 261,504

[1]

$ 266,400

[1]

$ 264,586

[1]

$ 971,684

$ 1,048,505

$ 993,991

Type of Revenue [Extensible List]

us-gaap:ProductMember

us-gaap:ProductMember

us-gaap:ProductMember

us-gaap:ProductMember

us-gaap:ProductMember

us-gaap:ProductMember

us-gaap:ProductMember

us-gaap:ProductMember

us-gaap:ProductMember

us-gaap:ProductMember

us-gaap:ProductMember

United States

Segment Reporting Information [Line Items]

Product revenues

$ 440,316

$ 488,926

$ 454,669

Germany

Segment Reporting Information [Line Items]

Product revenues

81,315

88,366

71,768

Japan

Segment Reporting Information [Line Items]

Product revenues

76,197

62,633

57,467

China

Segment Reporting Information [Line Items]

Product revenues

71,461

93,628

93,645

South Korea

Segment Reporting Information [Line Items]

Product revenues

63,339

58,717

64,715

Czech Republic

Segment Reporting Information [Line Items]

Product revenues

38,888

42,665

38,828

Canada

Segment Reporting Information [Line Items]

Product revenues

37,804

44,500

46,368

United Kingdom

Segment Reporting Information [Line Items]

Product revenues

31,357

37,533

36,033

Romania

Segment Reporting Information [Line Items]

Product revenues

26,213

22,435

18,050

Other

Segment Reporting Information [Line Items]

Product revenues

104,794

109,102

112,448

Non U.S.

Segment Reporting Information [Line Items]

Product revenues

$ 531,368

$ 559,579

$ 539,322

[1]

Product revenues for 2018 have been adjusted to conform with the current year presentation, related to a reclassification of customer relationship amortization from product revenues to selling, general and administrative expenses.  See Note 2, “Significant Accounting Policies” to the consolidated financial statements included in this Report for further details regarding these adjustments.

Segment Reporting - Percentage

Segment Reporting - Percentage of Total Product Revenues Generated from Customers (Detail) - Sales Revenue, Net - Customer Concentration Risk	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Lear
Segment Reporting Information [Line Items]
Total product revenues in percentage	16.00%	17.00%	20.00%
Adient
Segment Reporting Information [Line Items]
Total product revenues in percentage	15.00%	16.00%	18.00%

Segment Reporting - Segment Rep

Segment Reporting - Segment Reporting About Property and Equipment, Net by Geographic Areas (Detail) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Segment Reporting Information [Line Items]
Property and equipment, net	$ 160,605	$ 171,380
Macedonia
Segment Reporting Information [Line Items]
Property and equipment, net	38,989	39,664
China
Segment Reporting Information [Line Items]
Property and equipment, net	23,721	26,108
Vietnam
Segment Reporting Information [Line Items]
Property and equipment, net	21,452	20,768
United States
Segment Reporting Information [Line Items]
Property and equipment, net	21,280	24,122
Mexico
Segment Reporting Information [Line Items]
Property and equipment, net	19,982	26,119
Ukraine
Segment Reporting Information [Line Items]
Property and equipment, net	11,727	10,670
Germany
Segment Reporting Information [Line Items]
Property and equipment, net	10,515	9,874
Hungary
Segment Reporting Information [Line Items]
Property and equipment, net	6,803	7,546
Other
Segment Reporting Information [Line Items]
Property and equipment, net	$ 6,136	$ 6,509

Revenue Recognition - Additiona

Revenue Recognition - Additional Information (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2019USD ($)
Revenue Recognition And Deferred Revenue [Abstract]
Aggregate amount of transaction price allocated to material rights that remain unsatisfied under LTAs	$ 579
Revenue expected to be recognized in 2020	69.00%
Revenue expected to be recognized in 2021	11.00%
Revenue expected to be recognized in 2022	11.00%
Revenue expected to be recognized in 2023	9.00%

Revenue Recognition - Additio_2

Revenue Recognition - Additional Information (Details 1)	Dec. 31, 2019
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date: 2020-01-01
Deferred Revenue Arrangement [Line Items]
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period	1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date: 2021-01-01
Deferred Revenue Arrangement [Line Items]
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period	1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date: 2022-01-01
Deferred Revenue Arrangement [Line Items]
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period	1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date: 2023-01-01
Deferred Revenue Arrangement [Line Items]
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period	1 year

Unearned Revenue By Segment (De

Unearned Revenue By Segment (Detail) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Deferred Revenue Arrangement [Line Items]
Unearned revenue	$ 579	$ 1,597
Automotive Segments
Deferred Revenue Arrangement [Line Items]
Unearned revenue	$ 579	1,597
Industrial Segments
Deferred Revenue Arrangement [Line Items]
Unearned revenue		$ 5,296

Changes in Unearned Revenue (De

Changes in Unearned Revenue (Detail) $ in Thousands	12 Months Ended
	Dec. 31, 2019USD ($)
Revenue Recognition And Deferred Revenue [Abstract]
Beginning balance	$ 1,597
Additions to unearned revenue	234
Reclassified to revenue	(1,238)
Currency impacts	(14)
Ending balance	$ 579

Income Taxes - Additional Infor

Income Taxes - Additional Information (Detail) - USD ($)	Dec. 22, 2017	Dec. 21, 2017	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Income Taxes [Line Items]
Tax cuts and jobs act of 2017, incomplete accounting, provisional income tax expense				$ 19,997,000	$ 20,153,000
U.S. federal statutory corporate tax rate	21.00%	35.00%	21.00%	21.00%	34.00%
Tax cuts and jobs act of 2017, incomplete accounting, change in tax rate, deferred tax balances, income tax expense				$ 4,950,000
Tax cuts and jobs act of 2017, incomplete accounting, provisional income tax expense related to onetime transition tax liability of foreign subsidiaries				24,625,000
Tax cuts and jobs act of 2017, incomplete accounting, benefit included in provision for income taxes to offset one-time transition tax related to previous deferred tax liability that existed for undistributed foreign earnings that were not permanently reinvested					$ 9,578,000
Undistributed earnings offsetting with dividend received deduction percent			100.00%
Income tax holiday, amount of corporate income tax savings realized			$ 21,645,000	16,220,000	34,028,000
Total unrecognized tax benefits			$ 3,795,000	2,819,000	$ 3,812,000	$ 3,877,000
Macedonia
Income Taxes [Line Items]
Income tax holiday, description			The government of Macedonia granted the Company a tax holiday that released the Company from the obligation to pay corporate income taxes for a ten year period, subject to certain limitations.
Income tax holiday, period			10 years
Income tax holiday, amount of corporate income tax savings realized			$ 0	$ 0
Preferred Financing
Income Taxes [Line Items]
Net operating loss carryforward annual limitation			591,000
Net operating loss carryforward expected to expire			0
Net operating loss expired			$ 19,349,000
U.S. State | Earliest Tax Year
Income Taxes [Line Items]
Operating loss carryforward, year of expiration			2020
U.S. State | Latest Tax Year
Income Taxes [Line Items]
Operating loss carryforward, year of expiration			2039
Non-U.S. Subsidiaries
Income Taxes [Line Items]
Operating loss carryforward, amount			$ 122,818,000
Operating loss valuation allowance			110,012,000
Foreign Jurisdictions
Income Taxes [Line Items]
Operating loss carryforward, amount			$ 13,153,000
Foreign Jurisdictions | Earliest Tax Year
Income Taxes [Line Items]
Operating loss carryforward, year of expiration			2020
Foreign Jurisdictions | Latest Tax Year
Income Taxes [Line Items]
Operating loss carryforward, year of expiration			2024
Indefinite
Income Taxes [Line Items]
Operating loss carryforward, amount			$ 109,665,000
Net operating loss carryforward, year of expiration			no expiration date

Income Taxes - Deferred Tax Ass

Income Taxes - Deferred Tax Assets and Deferred Tax Liabilities (Detail) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Deferred tax assets:
Net operating losses	$ 17,881	$ 7,666
Intangible assets	33,609	42,853
Research and development credits	9,752	8,211
Depreciation	7,223	6,321
Valuation reserves and accrued liabilities	7,196	4,849
Foreign tax credit	262	376
Stock compensation	3,485	4,128
Inventory	1,284	1,069
Patents	134	150
Defined benefit obligation	2,027	1,796
Other credits	11,491	3,701
Other	114	89
Total deferred tax asset	94,458	81,209
Valuation allowance	(28,763)	(9,977)
Deferred tax liabilities:
Unrealized foreign currency exchange gains	(674)	(554)
Undistributed profits of subsidiary	(4,629)	(4,352)
Property and equipment	(3,366)	(2,896)
Other	(733)	(583)
Total deferred tax liability	(9,402)	(8,385)
Net deferred tax asset	$ 56,293	$ 62,847

Income Taxes - Reconciliations

Income Taxes - Reconciliations Between Statutory Federal Income Tax Rate and Effective Rate (Detail)	Dec. 22, 2017	Dec. 21, 2017	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Income Tax Disclosure [Abstract]
Statutory Federal income tax rate	21.00%	35.00%	21.00%	21.00%	34.00%
Increase (decrease) resulting from:
Change in Valuation Allowance			30.70%	(6.60%)	10.60%
Effect of different tax rates of foreign jurisdictions			(24.80%)	(6.60%)	(20.80%)
US Tax Reform Items			4.30%	10.80%	29.10%
Research and Development Credits			(2.30%)	(2.50%)	(4.60%)
Non-deductible expenses			2.10%	3.40%	2.40%
Foreign, state and local tax, net of Federal benefit			1.70%	1.80%	0.80%
Tax effects of intercompany transfers			1.50%	0.80%	(5.00%)
Undistributed profit of subsidiaries			1.20%	1.20%	5.80%
Other			1.20%	4.60%	(1.00%)
Stock Compensation Expense			0.00%	0.00%	(2.20%)
Effective Rate			36.60%	27.90%	49.10%

Income Taxes - Net Operating Lo

Income Taxes - Net Operating Loss Carryforwards (Detail) $ in Thousands	12 Months Ended
	Dec. 31, 2019USD ($)
U.S. Federal and state income tax
Operating Loss Carryforwards [Line Items]
Operating loss carryforward, amount	$ 85,828
U.S. Federal and state income tax | Minimum
Operating Loss Carryforwards [Line Items]
Operating loss carryforward, year of expiration	2020
U.S. Federal and state income tax | Maximum
Operating Loss Carryforwards [Line Items]
Operating loss carryforward, year of expiration	2039
Foreign
Operating Loss Carryforwards [Line Items]
Operating loss carryforward, amount	$ 13,153
Foreign | Minimum
Operating Loss Carryforwards [Line Items]
Operating loss carryforward, year of expiration	2020
Foreign | Maximum
Operating Loss Carryforwards [Line Items]
Operating loss carryforward, year of expiration	2024
Indefinite
Operating Loss Carryforwards [Line Items]
Operating loss carryforward, amount	$ 109,665
Operating loss carryforward, year of expiration	Indefinite

Income Taxes - Earnings Before

Income Taxes - Earnings Before Income Taxes and Tax Provisions - (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Income (loss) before income taxes:
Domestic	$ 74,531	$ 10,092	$ 1,258
Foreign	(15,380)	48,027	67,997
Earnings before income tax	$ 59,151	$ 58,119	$ 69,255

Income Taxes - Provision for In

Income Taxes - Provision for Income Taxes (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Current income tax expense (benefit):
Federal	$ 262	$ 340	$ 4,140
State and local	94	(71)	150
Foreign	17,672	9,224	24,672
Total current income tax expense	18,028	9,493	28,962
Deferred income tax expense (benefit):
Federal	(2,490)	(1,422)	15,207
State and local	(1)	20	2,308
Foreign	6,108	8,129	(12,449)
Total deferred income tax expense	3,617	6,727	5,066
Total tax expense	$ 21,645	$ 16,220	$ 34,028

Income Taxes - Reconciliation o

Income Taxes - Reconciliation of Unrecognized Tax Benefits (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Income Tax Disclosure [Abstract]
Balance at beginning of year	$ 2,819	$ 3,812	$ 3,877
Additions based on tax position related to current year	661	221	1,758
Additions based on tax position related to prior year	352	423
Additions based on tax position related to prior year			(105)
Reductions from settlements and statute of limitation expiration		(1,469)	(2,247)
Effect of foreign currency translation	(37)	(168)	529
Balance at end of year	$ 3,795	$ 2,819	$ 3,812

Pension and Other Post Retire_3

Pension and Other Post Retirement Benefit Plans - Components of Net Periodic Benefit Cost for Company's Defined Benefit Plans (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
United States
Net periodic benefit cost:
Service cost			$ 101
Interest cost	$ 127	$ 114	111
Amortization of prior service cost and actuarial loss			509
Net periodic benefit cost	$ 127	$ 114	$ 721
Assumptions:
Discount rate	3.65%	2.95%	3.25%
German Plan
Net periodic benefit cost:
Interest cost	$ 147	$ 147	$ 130
Expected return on plan assets	(126)	(130)	(121)
Amortization of prior service cost and actuarial loss	72	73	78
Net periodic benefit cost	$ 93	$ 90	$ 87
Assumptions:
Discount rate	1.06%	2.04%	1.93%
Long-term return on assets	3.10%	3.40%	3.40%

Pension and Other Post Retire_4

Pension and Other Post Retirement Benefit Plans - Reconciliation of Change in Benefit Obligation, Change in Plan Assets and Balance Sheet Classification (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Balance sheet classification:
Pension benefit obligation	$ (8,057)	$ (7,211)
United States
Change in projected benefit obligation:
Balance at beginning of year	3,832	4,218
Interest cost	127	114	$ 111
Paid pension distributions	(342)	(342)
Actuarial (gains) losses	254	(158)
Balance at end of year	3,871	3,832	4,218
Change in plan assets:
Funded Status (underfunded)/overfunded	(3,871)	(3,832)
Balance sheet classification:
Other current liabilities	(342)	(342)
Pension benefit obligation	(3,529)	(3,490)
Accumulated other comprehensive loss (pre-tax):
Actuarial losses	$ 476	$ 222
Discount rate	2.40%	3.65%
German Plan
Change in projected benefit obligation:
Balance at beginning of year	$ 7,529	$ 7,927
Interest cost	147	147	130
Paid pension distributions	(285)	(292)
Actuarial (gains) losses	1,116	114
Exchange rate impact	(154)	(367)
Balance at end of year	8,353	7,529	7,927
Change in plan assets:
Balance at beginning of year	3,808	3,891
Actual return on plan assets	126	130
Contributions	284	292
Paid pension distributions	(284)	(292)
Actuarial losses	(30)	(30)
Exchange rate impact	(79)	(183)
Balance at end of year	3,825	3,808	$ 3,891
Funded Status (underfunded)/overfunded	(4,528)	(3,721)
Balance sheet classification:
Pension benefit obligation	(4,528)	(3,721)
Accumulated other comprehensive loss (pre-tax):
Actuarial losses	$ 3,398	$ 2,372
Discount rate	1.06%	2.04%

Pension and Other Post Retire_5

Pension and Other Post Retirement Benefit Plans - Summary of Pre-tax Amounts in AOCI Expected to Be Recognized in Net Periodic Benefit Cost (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
United States
Defined Benefit Plan Disclosure [Line Items]
Actuarial losses		$ 476	$ 222
German Plan
Defined Benefit Plan Disclosure [Line Items]
Actuarial losses		$ 3,398	$ 2,372
Scenario Forecast | United States
Defined Benefit Plan Disclosure [Line Items]
Actuarial losses	$ 7
Scenario Forecast | German Plan
Defined Benefit Plan Disclosure [Line Items]
Actuarial losses	$ 122

Pension and Other Post Retire_6

Pension and Other Post Retirement Benefit Plans - Summary of Accumulated Benefit Obligations (Detail) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
United States
Defined Benefit Plan Disclosure [Line Items]
Accumulated benefit obligation	$ 3,871	$ 3,832
German Plan
Defined Benefit Plan Disclosure [Line Items]
Accumulated benefit obligation	$ 8,529	$ 7,894

Pension and Other Post Retire_7

Pension and Other Post Retirement Benefit Plans - Additional Information (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Defined Benefit Plan Disclosure [Line Items]
Insurance policy value	$ 2,592,000	$ 2,148,000
401(k) Plan
Defined Benefit Plan Disclosure [Line Items]
Cost recognized for contributions to defined contribution plan	1,384,000	$ 1,471,000	$ 1,396,000
United States
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, expected employer contribution in next fiscal year	0
German Plan
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, expected employer contribution in next fiscal year	$ 0

Pension and Other Post Retire_8

Pension and Other Post Retirement Benefit Plans - Schedule of Future Expected Pension Payments (Detail) - Gentherm GmbH $ in Thousands	Dec. 31, 2019USD ($)
United States
Defined Benefit Plan Disclosure [Line Items]
2020	$ 342
2021	342
2022	342
2023	342
2024	342
2025-2029	1,710
Total projected pension benefit payments	3,420
German Plan
Defined Benefit Plan Disclosure [Line Items]
2020	289
2021	287
2022	283
2023	293
2024	287
2025-2029	2,839
Total projected pension benefit payments	$ 4,278

Goodwill and Other Intangible_2

Goodwill and Other Intangibles - Summary of Changes in the Carrying Amount of Goodwill, By Reportable Segment (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Goodwill [Line Items]
Balance, beginning of period	$ 55,311
Impairment of goodwill		$ (6,151)
Balance, end of period	64,572	55,311
Operating Segments
Goodwill [Line Items]
Balance, beginning of period	55,311	69,685
Reclassifications to assets held for sale		(6,844)
Impairment of goodwill		(6,151)
Stihler acquisition	9,816
Exchange rate impact	(555)	(1,379)
Balance, end of period	64,572	55,311
Automotive Segments | Operating Segments
Goodwill [Line Items]
Balance, beginning of period	37,533	38,912
Exchange rate impact	(595)	(1,379)
Balance, end of period	36,938	37,533
Industrial Segments
Goodwill [Line Items]
Balance, beginning of period	17,778	30,773
Reclassifications to assets held for sale		(6,844)
Impairment of goodwill		(6,151)
Stihler acquisition	9,816
Exchange rate impact	40
Balance, end of period	$ 27,634	$ 17,778

Goodwill and Other Intangible_3

Goodwill and Other Intangibles - Summary of Other Intangible Assets and Accumulated Amortization Balances (Detail) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Intangible Assets [Line Items]
Gross Carrying Value	$ 138,895	$ 137,583
Accumulated Amortization	(89,112)	(81,198)
Net Carrying Value	49,783	56,385
Net Carrying Value	49,783	56,385
Customer Relationships
Intangible Assets [Line Items]
Gross Carrying Value	89,208	87,316
Accumulated Amortization	(50,687)	(44,269)
Net Carrying Value	38,521	43,047
Technology
Intangible Assets [Line Items]
Gross Carrying Value	25,106	25,110
Accumulated Amortization	(19,866)	(18,616)
Net Carrying Value	5,240	6,494
Product Development Costs
Intangible Assets [Line Items]
Gross Carrying Value	19,911	20,487
Accumulated Amortization	(18,559)	(18,313)
Net Carrying Value	1,352	2,174
Tradenames
Intangible Assets [Line Items]
Net Carrying Value	$ 4,670	$ 4,670

Goodwill and Other Intangible_4

Goodwill and Other Intangibles - Additional Information (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Goodwill And Other Intangible Assets [Line Items]
Intangible assets	$ 49,783	$ 56,385
Other intangible assets including capitalized patent costs	10,068	14,043	$ 12,425
Impairment on assets held for sale		2,190
Goodwill impairment charges		6,151
Other intangible impairment charges		3,135
Customer Relationship
Goodwill And Other Intangible Assets [Line Items]
Intangible assets	38,521	43,047
Technology
Goodwill And Other Intangible Assets [Line Items]
Intangible assets	5,240	$ 6,494
Stihler Electronic GmbH | Customer Relationship
Goodwill And Other Intangible Assets [Line Items]
Intangible assets	$ 3,420
Acquired intangible assets useful life	9 years 2 months 12 days
Stihler Electronic GmbH | Technology
Goodwill And Other Intangible Assets [Line Items]
Intangible assets	$ 538
Acquired intangible assets useful life	7 years

Goodwill and Other Intangible_5

Goodwill and Other Intangibles - Summary of Estimate of Other Intangible Asset Amortization (Detail) $ in Thousands	Dec. 31, 2019USD ($)
Finite Lived Intangible Assets Future Amortization Expense [Abstract]
2020	$ 8,644
2021	7,700
2022	7,225
2023	4,082
2024	$ 3,033

Details of Certain Financial _3

Details of Certain Financial Statement Components (Detail) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Inventory:
Raw materials, net of reserve	$ 61,323	$ 61,679
Work in process, net of reserve	7,444	5,939
Finished goods, net of reserve	49,712	44,917
Total inventory, net	118,479	112,535
Current Assets:
Income tax and other tax receivables	17,057	28,887
Notes receivable	9,963	9,837
Prepaid expenses	7,022	6,962
Billable tooling	5,194	6,475
Short-term derivative financial instruments	1,242	92
Other	2,248	2,110
Total other current assets	42,726	54,363
Property and equipment:
Buildings and improvements	90,675	88,950
Plant and equipment	137,813	125,487
Information technology	27,697	26,381
Production tooling	19,906	15,526
Leasehold improvements	11,116	10,320
Construction in progress	2,856	3,421
Total property and equipment	290,063	270,085
Less: Accumulated depreciation	(129,458)	(98,705)
Total property and equipment, net	160,605	171,380
Other current liabilities:
Accrued employee liabilities	26,019	25,449
Liabilities from discounts and rebates	16,593	16,907
Income and other taxes payable	3,693	6,468
Restructuring	6,065	2,547
Accrued warranty	4,596	4,514	$ 5,382
Other	9,617	9,923
Total other current liabilities	$ 66,583	$ 65,808

Debt - Additional Information (

Debt - Additional Information (Detail) - USD ($)	Jun. 27, 2019	Jun. 26, 2019	Dec. 31, 2019	Dec. 31, 2018
Debt Instrument [Line Items]
Maximum percentage of stock of non US subsidiaries pledge to secure obligation			66.00%
Amended credit agreement, debt issuance costs			$ 1,278,000
Federal Funds Rate | Minimum
Debt Instrument [Line Items]
Interest rate			0.50%
Federal Funds Rate | Maximum
Debt Instrument [Line Items]
Interest rate			1.55%
London Interbank Offered Rate
Debt Instrument [Line Items]
Interest rate			1.76%
Revolving Note (U.S. Dollar)
Debt Instrument [Line Items]
Undrawn borrowing capacity			$ 403,378,000
United State Bank Of America Credit Facility
Debt Instrument [Line Items]
Interest rate			4.75%
Euro Currency Rate Loans
Debt Instrument [Line Items]
Interest rate			1.00%
Euro Currency Rate Loans | Credit Agreement | Minimum
Debt Instrument [Line Items]
Interest rate			1.25%
Euro Currency Rate Loans | Credit Agreement | Maximum
Debt Instrument [Line Items]
Interest rate			2.25%
Base Rate Loans | Credit Agreement | Minimum
Debt Instrument [Line Items]
Interest rate			0.25%
Base Rate Loans | Credit Agreement | Maximum
Debt Instrument [Line Items]
Interest rate			1.25%
DEG Vietnam Loan
Debt Instrument [Line Items]
Semi-annual principal payments earliest date			2017-11
Semi-annual principal payments latest date			2023-05
DEG Loan
Debt Instrument [Line Items]
Semi-annual principal payments earliest date			2015-03
Semi-annual principal payments latest date			2019-09
Revolving Credit Facility | Revolving Note (U.S. Dollar)
Debt Instrument [Line Items]
Maximum borrowing capacity	$ 475,000,000	$ 350,000,000		$ 350,000,000
Maximum borrowing capacity increase subject to specified conditions			$ 175,000,000
Debt maturity date	Jun. 27, 2024	Mar. 17, 2021
Revolving Credit Facility | Revolving Note (U.S. Dollar) | Letters of Credit
Debt Instrument [Line Items]
Maximum borrowing capacity			15,000,000
Line of credit, outstanding amount			0	$ 455,000
Revolving Credit Facility | Revolving Note (U.S. Dollar) | Swing Line Loans
Debt Instrument [Line Items]
Maximum borrowing capacity			$ 40,000,000

Summary of Company's Debt (Deta

Summary of Company's Debt (Detail) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Debt Instrument [Line Items]
Total debt	$ 80,624	$ 139,890
Current maturities	(2,500)	(3,413)
Long-term debt, less current maturities	$ 78,124	$ 136,477
U.S. Revolving Note (U.S. Dollar Denominations)
Debt Instrument [Line Items]
Interest Rate	3.05%	4.02%
Total debt	$ 50,000	$ 122,000
U.S. Revolving Note (Euro Denominations)
Debt Instrument [Line Items]
Interest Rate	1.25%	1.50%
Total debt	$ 21,874	$ 5,727
DEG Vietnam Loan
Debt Instrument [Line Items]
Interest Rate	5.21%	5.21%
Total debt	$ 8,750	$ 11,250
DEG China Loan
Debt Instrument [Line Items]
Interest Rate		4.25%
Total debt		$ 913

Principal Maturities of Debt (D

Principal Maturities of Debt (Detail) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Debt Instrument [Line Items]
Debt maturing in 2020	$ 2,500
Debt maturing in 2021	2,500
Debt maturing in 2022	2,500
Debt maturing in 2023	1,250
Debt maturing in 2024	71,874
Total debt	80,624	$ 139,890
US and Euro Denominated Revolving Note
Debt Instrument [Line Items]
Debt maturing in 2024	71,874
Total debt	71,874
DEG Vietnam Loan
Debt Instrument [Line Items]
Debt maturing in 2020	2,500
Debt maturing in 2021	2,500
Debt maturing in 2022	2,500
Debt maturing in 2023	1,250
Total debt	$ 8,750	$ 11,250

Reconciliation of Cash and Cash

Reconciliation of Cash and Cash Equivalents and Restricted Cash (Detail) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Accounting Policies [Abstract]
Cash and cash equivalents presented in the consolidated balance sheets	$ 50,443	$ 39,620
Restricted cash	2,505
Cash, cash equivalents and restricted cash presented in the consolidated statements of cash flows	$ 52,948	$ 39,620	$ 103,172	$ 177,187

Financial Instruments - Additio

Financial Instruments - Additional Information (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Derivative [Line Items]
Maximum length of time to hedge exposure to foreign currency exchange risk	1 year
Foreign Currency Derivatives
Derivative [Line Items]
Notional Value	$ 14,449,000	$ 33,250,000
Interest Rate Swap
Derivative [Line Items]
Hedge Ineffectiveness Incurred	$ 0	$ 0

Information Related to Recurrin

Information Related to Recurring Fair Value Measurement of Derivative Financial Instruments in the Consolidated Balance Sheet (Detail) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Derivatives Fair Value [Line Items]
Net Asset/ (Liabilities)	$ 1,242	$ 92
Fair Value, Inputs, Level 2 | Foreign Currency Derivatives | Designated as Hedging Instrument
Derivatives Fair Value [Line Items]
Net Asset/ (Liabilities)	1,242	92
Fair Value, Inputs, Level 2 | Foreign Currency Derivatives | Designated as Hedging Instrument | Other Current Assets
Derivatives Fair Value [Line Items]
Asset Derivatives, Fair Value	$ 1,242	$ 92

Information Related to Effect o

Information Related to Effect of Derivative Instrument's on the Consolidated Statements of Income (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Derivative Instruments Gain Loss [Line Items]
Gain (loss) on derivatives	$ 3,081	$ 777
Commodity Derivatives
Derivative Instruments Gain Loss [Line Items]
Gain (loss) on derivatives		(73)
Other comprehensive income | Foreign Currency Derivatives
Derivative Instruments Gain Loss [Line Items]
Gain (loss) on derivatives	1,151	1,096
Other comprehensive income | Commodity Derivatives
Derivative Instruments Gain Loss [Line Items]
Gain (loss) on derivatives		(218)
Cost of sales | Foreign Currency Derivatives
Derivative Instruments Gain Loss [Line Items]
Gain (loss) on derivatives	1,976	(444)
Cost of sales | Commodity Derivatives
Derivative Instruments Gain Loss [Line Items]
Gain (loss) on derivatives		145
Selling, general and administrative expense | Foreign Currency Derivatives
Derivative Instruments Gain Loss [Line Items]
Gain (loss) on derivatives		75
Foreign currency gain (loss) | Foreign Currency Derivatives
Derivative Instruments Gain Loss [Line Items]
Gain (loss) on derivatives	$ (46)	$ 50

Fair Value Measurements - Addit

Fair Value Measurements - Additional Information (Detail) - USD ($)	Dec. 31, 2019	Dec. 31, 2018
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Carrying value	$ 80,624,000	$ 139,890,000
Fair Value, Recurring Basis
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Financial assets, fair value	0	0
Financial liabilities, fair value	0	0
Fair Value, Nonrecurring Basis
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Financial assets, fair value	0	0
Financial liabilities, fair value	0	0
Fair Value, Nonrecurring Basis | Level 3
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Estimated fair value related to other intangible assets	4,380,000
DEG Vietnam Loan
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Carrying value	8,750,000	11,250,000
Fair value	$ 8,785,000	11,100,000
DEG China Loan
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Carrying value		913,000
Fair value		$ 900,000

Equity - Additional Information

Equity - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Millions	1 Months Ended		12 Months Ended
	Jun. 30, 2018	Dec. 31, 2016	Dec. 31, 2019	Dec. 31, 2018
Class Of Stock [Line Items]
Common Stock, shares authorized			55,000,000	55,000,000
Preferred stock, shares authorized			4,991,000
Common Stock, shares issued			32,674,354	33,856,629
Common Stock, shares outstanding			32,674,354	33,856,629
Preferred stock, shares issued			0
Preferred stock, shares outstanding			0
Stock repurchase program period		3 years
Stock repurchase program, authorized amount		$ 100
Authorized increase and extension in stock repurchase program amount	$ 300
Stock repurchase program extended expiration date	2020-12
Shares repurchased			63,000,000
Shares repurchased average price paid per share			$ 39.67
Remaining authorized repurchase amount			$ 83
Maximum
Class Of Stock [Line Items]
Shares issued			59,991,000

Schedule of Reclassification Ad

Schedule of Reclassification Adjustments and Other Activities Impacting Accumulated Other Comprehensive Income (Loss) (Detail) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning Balance		$ (39,500)	$ (20,444)	$ (69,091)
Cumulative effect of accounting change due to adoption of ASU 2018-02			(40)
Other comprehensive income (loss) before reclassifications		(1,420)	(17,852)	50,602
Income tax effect of other comprehensive income (loss) before reclassifications		(654)	(742)	(575)
Amounts reclassified from accumulated other comprehensive income (loss) into net income		(1,108)	(391)	(1,943)
Income taxes reclassified into net income		241	(31)	563
Other comprehensive loss, net of tax		(2,941)	(19,056)	48,647
Ending Balance		(42,441)	(39,500)	(20,444)
Defined Benefit Pension Plans
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning Balance		(2,339)	(2,366)	(2,550)
Cumulative effect of accounting change due to adoption of ASU 2018-02			(49)
Other comprehensive income (loss) before reclassifications		(1,264)	18	166
Income tax effect of other comprehensive income (loss) before reclassifications		232	(15)	(60)
Amounts reclassified from accumulated other comprehensive income (loss) into net income			73	78
Other comprehensive loss, net of tax		(1,032)	27	184
Ending Balance		(3,371)	(2,339)	(2,366)
Foreign Currency Translation Adjustments
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning Balance		(37,157)	(17,555)	(65,762)
Other comprehensive income (loss) before reclassifications		(2,415)	(19,212)	48,059
Income tax effect of other comprehensive income (loss) before reclassifications		(393)	(390)	148
Other comprehensive loss, net of tax		(2,808)	(19,602)	48,207
Ending Balance		(39,965)	(37,157)	(17,555)
Foreign Currency Hedge Derivatives
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning Balance		(4)	(800)	(1,020)
Other comprehensive income (loss) before reclassifications		2,259	1,342	2,123
Income tax effect of other comprehensive income (loss) before reclassifications		(493)	(337)	(570)
Amounts reclassified from accumulated other comprehensive income (loss) into net income	[1]	(1,108)	(246)	(1,822)
Income taxes reclassified into net income		241	37	489
Other comprehensive loss, net of tax		899	796	220
Ending Balance		$ 895	(4)	(800)
Commodity Hedge Derivatives
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning Balance			277	241
Cumulative effect of accounting change due to adoption of ASU 2018-02			9
Other comprehensive income (loss) before reclassifications				254
Income tax effect of other comprehensive income (loss) before reclassifications				(93)
Amounts reclassified from accumulated other comprehensive income (loss) into net income	[1]		(218)	(199)
Income taxes reclassified into net income			(68)	74
Other comprehensive loss, net of tax			$ (277)	36
Ending Balance				$ 277
[1]	The amounts reclassified from accumulated other comprehensive income (loss) are included in cost of sales.  See Note 14 for information related to the effect of commodity and foreign currency derivative instrument`s on our consolidated statements of income.

Accounting for Stock Based Co_3

Accounting for Stock Based Compensation - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Thousands	May 19, 2017	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2013	Dec. 31, 2016	May 16, 2013
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock option grant expiration period					10 years
Performance based restricted stock units outstanding		34,920	136,566	282,100		210,481
Shareholder Return Award Performance Measurement Period		3 years
Unrecognized compensation cost related to non-vested options and restricted options		$ 13,168	$ 15,932
Unrecognized share-based compensation cost recognition period		2 years
Share based compensation expense		$ 8,589	12,177	$ 12,727
Deferred tax benefit		$ 1,573	$ 2,434	$ 4,339
Granted, Shares		0	0	808,500
Weighted average grant date fair value of options granted				$ 9.11
Total intrinsic value of options exercised		$ 1,681	$ 5,061	$ 4,715
Total fair value of restricted shares vested		$ 3,697	$ 4,599	$ 6,006
Granted, Shares		19,920	21,681	237,542
Performance Based Restricted Stock Units
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Performance based restricted stock units outstanding		190,080
These awards vesting period		3 years
Stock option achieving minimum threshold		50.00%
Stock option achieving maximum threshold		200.00%
RSU
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Performance based restricted stock units outstanding		331,821	215,969
Granted, Shares		220,146	215,969	0
Stock Appreciation Rights (SARs)
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Granted, Shares				235,000
Total intrinsic value of options exercised		$ 1,588	$ 3,532	$ 1,495
ROIC | Performance Based Restricted Stock Units
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Performance based restricted stock payment condition		one-half
TSR | Performance Based Restricted Stock Units
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Performance based restricted stock payment condition		one-half
Employee and Consultants | Minimum
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Share based compensation, requisite service period		3 years
Employee and Consultants | Maximum
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Share based compensation, requisite service period		5 years
Director
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Share based compensation, requisite service period		1 year
2013 Plan
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of shares authorized for grant		1,308,458
Number of shares authorized for grant							3,500,000
Number of increased shares available for grant	2,000,000
Equity Incentive Plan Twenty Eleven and Two Thousand and Six
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of shares authorized for grant							0

Accounting for Stock Based Co_4

Accounting for Stock Based Compensation - Summarizes Stock Option Activity (Detail) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Stock Options Outstanding, beginning balance, Shares	1,653,000	2,652,142	2,103,470
Granted, Shares	0	0	808,500
Exercised, Shares	(428,250)	(615,358)	(202,328)
Forfeited, Shares	(355,750)	(383,784)	(57,500)
Stock Options Outstanding, ending balance, Shares	869,000	1,653,000	2,652,142	2,103,470
Stock Options Exercisable, Shares	665,000	788,125	984,374
Stock Options Outstanding, beginning balance, Weighted-Average Exercise Price	$ 38.53	$ 35.34	$ 32.72
Granted, Weighted-Average Exercise Price			37.23
Exercised, Weighted-Average Exercise Price	38.66	24.01	13.62
Forfeited, Weighted-Average Exercise Price	39.99	39.59	42.54
Stock Options Outstanding, ending balance, Weighted-Average Exercise Price	37.87	38.53	35.34	$ 32.72
Exercisable, Weighted-Average Exercise Price	$ 38.10	$ 38.15	$ 29.84
Stock Options Outstanding, Weighted-Average Remaining Contractual Term	3 years 6 months 3 days	4 years 3 months 10 days	4 years 9 months 3 days	4 years 10 months 9 days
Exercisable, Weighted-Average Remaining Contractual Term	3 years 2 months 23 days	3 years 8 months 15 days	3 years 5 months 8 days
Stock Options Outstanding, Aggregate Intrinsic Value	$ 5,172	$ 3,610	$ 6,964	$ 12,265
Exercisable, Aggregate Intrinsic Value	$ 3,725	$ 2,200	$ 6,534

Accounting for Stock Based Co_5

Accounting for Stock Based Compensation - Fair Value of Option on date of grant (Detail)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Statement Of Stockholders Equity [Abstract]
Expected volatility			33.00%
Weighted-average expected volatility			33.00%
Expected lives			3 years
Risk-free interest rate			1.49%
Risk-free interest rate			1.93%
Expected dividend yield	0.00%	0.00%	0.00%

Accounting for Stock Based Co_6

Accounting for Stock Based Compensation - Summarizes Restricted Stock Activity (Detail) - $ / shares	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Outstanding at beginning of period, Shares	136,566	282,100	210,481
Granted, Shares	19,920	21,681	237,542
Exercised, Shares	(91,566)	(130,684)	(165,923)
Forfeited, Shares	(30,000)	(36,531)
Outstanding at end of period, Shares	34,920	136,566	282,100
Outstanding at beginning of period, Weighted-Average Grant Date Fair Value	$ 37.16	$ 38.06	$ 39.02
Granted, Weighted-Average Grant Date Fair Value	40.16	35	37.30
Exercised, Weighted-Average Grant Date Fair Value	37.09	38.62	37.99
Forfeited, Weighted-Average Grant Date Fair Value	38.05	37.60
Outstanding at end of period, Weighted-Average Grant Date Fair Value	$ 38.31	$ 37.16	$ 38.06

Accounting for Stock Based Co_7

Accounting for Stock Based Compensation - Summarizes Restricted Stock Unit Activity (Detail) - shares	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Outstanding at beginning of period, Shares	136,566	282,100	210,481
Granted, Shares	19,920	21,681	237,542
Forfeited, Shares	(30,000)	(36,531)
Outstanding at end of period, Shares	34,920	136,566	282,100
RSU
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Outstanding at beginning of period, Shares	215,969
Granted, Shares	220,146	215,969	0
Vested, Shares	(23,956)
Forfeited, Shares	(80,338)
Outstanding at end of period, Shares	331,821	215,969
RSU | Time Vesting Shares [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Outstanding at beginning of period, Shares	86,392
Granted, Shares	107,391	86,392
Vested, Shares	(23,956)
Forfeited, Shares	(28,086)
Outstanding at end of period, Shares	141,741	86,392
RSU | ROIC Target Shares [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Outstanding at beginning of period, Shares	64,785
Granted, Shares	56,380	64,785
Forfeited, Shares	(26,124)
Outstanding at end of period, Shares	95,041	64,785
RSU | TSR Target Shares [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Outstanding at beginning of period, Shares	64,792
Granted, Shares	56,375	64,792
Forfeited, Shares	(26,128)
Outstanding at end of period, Shares	95,039	64,792

Accounting for Stock Based Co_8

Accounting for Stock Based Compensation - Summarizes Stock Appreciation Rights (SARs) Activity (Detail) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock Options Outstanding, beginning balance, Shares	1,653,000	2,652,142	2,103,470
Granted, Shares	0	0	808,500
Exercised, Shares	(428,250)	(615,358)	(202,328)
Forfeited, Shares	(355,750)	(383,784)	(57,500)
Stock Options Outstanding, ending balance, Shares	869,000	1,653,000	2,652,142	2,103,470
Exercisable, Ending Balance	665,000	788,125	984,374
Stock Options Outstanding, beginning balance, Weighted-Average Exercise Price	$ 38.53	$ 35.34	$ 32.72
Granted, Weighted-Average Exercise Price			37.23
Exercised, Weighted-Average Exercise Price	38.66	24.01	13.62
Forfeited, Weighted-Average Exercise Price	39.99	39.59	42.54
Stock Options Outstanding, ending balance, Weighted-Average Exercise Price	37.87	38.53	35.34	$ 32.72
Exercisable, Weighted Average Exercise Price	$ 38.10	$ 38.15	$ 29.84
Stock Options Outstanding, Weighted-Average Remaining Contractual Term	3 years 6 months 3 days	4 years 3 months 10 days	4 years 9 months 3 days	4 years 10 months 9 days
Exercisable, Weighted-Average Remaining Contractual Term	3 years 2 months 23 days	3 years 8 months 15 days	3 years 5 months 8 days
Outstanding, Aggregate Intrinsic Value	$ 5,172	$ 3,610	$ 6,964	$ 12,265
Exercisable, Aggregate Intrinsic Value	$ 3,725	$ 2,200	$ 6,534
Stock Appreciation Rights (SARs)
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock Options Outstanding, beginning balance, Shares	988,100	1,192,350	1,244,600
Granted, Shares			235,000
Exercised, Shares	(179,500)	(204,250)	(94,250)
Forfeited, Shares	(254,350)		(193,000)
Stock Options Outstanding, ending balance, Shares	554,250	988,100	1,192,350	1,244,600
Exercisable, Ending Balance	401,438	683,600	613,808
Stock Options Outstanding, beginning balance, Weighted-Average Exercise Price	$ 40.61	$ 38.17	$ 36.11
Granted, Weighted-Average Exercise Price			38.05
Exercised, Weighted-Average Exercise Price	32.84	26.35	22.21
Forfeited, Weighted-Average Exercise Price	42.63		32.53
Stock Options Outstanding, ending balance, Weighted-Average Exercise Price	39.41	40.61	38.17	$ 36.11
Exercisable, Weighted Average Exercise Price	$ 39.62	$ 41.21	$ 37.68
Stock Options Outstanding, Weighted-Average Remaining Contractual Term	2 years 10 months 2 days	3 years 6 months 25 days	4 years 4 months 9 days	4 years 9 months 18 days
Exercisable, Weighted-Average Remaining Contractual Term	2 years 5 months 15 days	3 years 1 month 2 days	3 years 8 months 19 days
Outstanding, Aggregate Intrinsic Value	$ 2,981	$ 2,064	$ 2,278	$ 3,511
Exercisable, Aggregate Intrinsic Value	$ 2,135	$ 1,728	$ 1,904

Leases - Components of Lease Ex

Leases - Components of Lease Expense and Other Information (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2019USD ($)
Lease cost:
Operating lease cost	$ 5,899
Short-term lease cost	3,444
Sublease income	(128)
Total lease cost	9,215
Gain on sales and leaseback transactions, net	207
Operating cash flows from operating leases	6,059
Right-of-use lease assets obtained in exchange for lease obligations, Operating leases	$ 4,111
Weighted-average remaining lease term, Operating leases	4 years 6 months
Weighted-average discount rate, Operating leases	5.46%

Leases - Summary of Operating L

Leases - Summary of Operating Leases Under all Non-Cancellable Operating Leases (Detail) $ in Thousands	Dec. 31, 2019USD ($)
Leases [Abstract]
2020	$ 4,847
2021	2,949
2022	1,602
2023	796
2024	790
2025 or later	1,832
Total future minimum lease payments	12,816
Less: imputed interest	(1,479)
Total	$ 11,337

Summary of Maturities of Lease

Summary of Maturities of Lease Liabilities Under Previous Lease Accounting (Detail) $ in Thousands	Dec. 31, 2018USD ($)
Leases [Abstract]
2019	$ 7,530
2020	5,016
2021	2,468
2022	2,152
2023	1,532
2024 or later	4,021
Total	$ 22,719

Commitments and Contingencies -

Commitments and Contingencies - Reconciliation of Changes in Accrued Warranty Costs (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Loss Contingency [Abstract]
Balance at beginning of year	$ 4,514	$ 5,382
Warranty claims paid	(584)	(905)
Warranty expense for products shipped during the current period	2,370	2,678
Adjustments to warranty estimates from prior periods	(1,660)	(608)
Acquisition of business	21
Reclassification to liabilities held for sale		(1,884)
Adjustments due to currency translation	(65)	(149)
Balance at end of year	$ 4,596	$ 4,514

Commitments and Contingencies_2

Commitments and Contingencies - Additional Information (Detail)	12 Months Ended
	Dec. 31, 2019Agreement
Loss Contingencies [Line Items]
Number of agreements expire in 2020	0
Labor Agreements
Loss Contingencies [Line Items]
Percentage of workforce as members of industrial trade unions	25.00%

Selected Quarterly Informatio_3

Selected Quarterly Information (Unaudited) - Summary of Selected Quarterly Information (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended												12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018		Sep. 30, 2018		Jun. 30, 2018		Mar. 31, 2018		Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Selected Quarterly Financial Information [Abstract]
Product revenues	$ 230,381	$ 240,056	$ 243,326	$ 257,921	$ 256,015	[1]	$ 261,504	[1]	$ 266,400	[1]	$ 264,586	[1]	$ 971,684	$ 1,048,505	$ 993,991
Type of Revenue [Extensible List]	us-gaap:ProductMember	us-gaap:ProductMember	us-gaap:ProductMember	us-gaap:ProductMember	us-gaap:ProductMember		us-gaap:ProductMember		us-gaap:ProductMember		us-gaap:ProductMember		us-gaap:ProductMember	us-gaap:ProductMember	us-gaap:ProductMember
Gross margin	$ 65,622	$ 74,692	$ 72,714	$ 75,307	$ 70,820		$ 75,704		$ 77,092		$ 81,242		$ 288,335	$ 304,858	$ 319,195
Net income (loss)	$ 10,454	$ 15,887	$ 2,751	$ 8,414	$ 12,629		$ (355)		$ 16,659		$ 12,966		$ 37,506	$ 41,899	$ 35,227
Basic earnings (loss) per share	$ 0.32	$ 0.48	$ 0.08	$ 0.25	$ 0.37		$ (0.01)		$ 0.46		$ 0.35		$ 1.13	$ 1.17	$ 0.96
Diluted earnings (loss) per share	$ 0.32	$ 0.48	$ 0.08	$ 0.25	$ 0.36		$ (0.01)		$ 0.45		$ 0.35		$ 1.13	$ 1.16	$ 0.96
[1]	Product revenues for 2018 have been adjusted to conform with the current year presentation, related to a reclassification of customer relationship amortization from product revenues to selling, general and administrative expenses.  See Note 2, “Significant Accounting Policies” to the consolidated financial statements included in this Report for further details regarding these adjustments.

Valuation and Qualifying Acco_2

Valuation and Qualifying Accounts (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Allowance for Doubtful Accounts
Valuation And Qualifying Accounts Disclosure [Line Items]
Balance at Beginning of Period	$ 851	$ 973	$ 1,391
Charged to Costs and Expenses	969	1,005	1,239
Charged to Other Accounts	(8)	(121)	51
Deductions from Reserves	(619)	(1,006)	(1,708)
Balance at End of Period	1,193	851	973
Allowance for Deferred Income Tax Assets
Valuation And Qualifying Accounts Disclosure [Line Items]
Balance at Beginning of Period	9,977	27,578	19,304
Charged to Costs and Expenses	19,277		6,700
Charged to Other Accounts	(491)	(14,009)	1,574
Deductions from Reserves		(3,592)
Balance at End of Period	28,763	9,977	27,578
Reserve for Inventory
Valuation And Qualifying Accounts Disclosure [Line Items]
Balance at Beginning of Period	6,270	7,887	4,790
Charged to Costs and Expenses	1,679	2,712	3,521
Charged to Other Accounts	(56)	(1,047)	302
Deductions from Reserves	(1,820)	(3,282)	(726)
Balance at End of Period	$ 6,073	$ 6,270	$ 7,887