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Pension and Other Post Retirement Benefit Plans - Additional Information (Detail) | 12 Months Ended
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Dec. 31, 2015 USD ($) Payment | Dec. 31, 2014 USD ($) | Dec. 31, 2013 USD ($)
Defined Benefit Plan Disclosure [Line Items] |  |  |
Vesting period | 6 years |  |
Discount rate for net periodic service cost | 3.25% | 4.25% | 3.25%
Discount rate for benefit obligation | 3.40% | 3.25% | 4.25%
Insurance policy value | $ 1,993,000 | $ 2,056,000 |
Tax (expense) benefit recognized in other comprehensive income | (23,000) | 121,000 | $ 0
Pretax unrecognized actuarial losses recorded in accumulated other comprehensive income (loss) | 266,000 | 328,000 |
Expected pretax unrecognized actuarial losses recorded in accumulated other comprehensive income (loss ) in next fiscal year | 0 |  |
Contributions to 401(k) plan | $ 959,000 | $ 543,000 | 191,000
Gentherm GmbH |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Discount rate for benefit obligation | 2.21% | 1.95% |
Tax (expense) benefit recognized in other comprehensive income | $ (211,000) | $ 559,000 | $ 18,000
Pretax unrecognized actuarial losses recorded in accumulated other comprehensive income (loss) | 1,821,000 | 2,267,000 |
Expected pretax unrecognized actuarial losses recorded in accumulated other comprehensive income (loss ) in next fiscal year | 47,000 |  |
Pension benefit obligation | 3,647,000 |  |
Underfunded defined benefit plan | 3,647,000 | 4,505,000 |
Defined benefit plan, expected employer contribution in next fiscal year | 257,000 |  |
Gentherm GmbH | Accrued Liabilities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Portion of the net benefit obligation payable | 0 | $ 274,000 |
Chief Executive Officer |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Annual retirement payment | $ 300,000,000 |  |
Number of expected annual retirement benefit payments | Payment | 15 |  |
Annual retirement benefit payments, earliest date | Jan. 01, 2018 |  |

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- Definition Defined benefit plan vesting period. + References No definition available. + Details
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- Definition Number of expected annual retirement benefit payments. + References No definition available. + Details
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- Definition A type of defined benefit plan that does not include any plan assets to pay for future pension benefit obligations. + References No definition available. + Details
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- Definition The pretax net amount of gains and losses that are not yet recognized as a component of net periodic benefit cost, and that are recognized as increases or decreases in other comprehensive income as they arise. Gains and losses are due to changes in the value of either the benefit obligation or the plan assets resulting from experience different from that assumed or from a change in an actuarial assumption, or the consequence of a decision to temporarily deviate from the substantive plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 10A -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=36458714&loc=SL7669646-108580 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (j) -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920 + Details
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- Definition Amount included in accumulated other comprehensive income (AOCI) expected to be recognized as components of net periodic benefit cost for the fiscal year that follows the most recent annual statement of financial position, including gain (loss), prior service cost (credit), and transition asset (obligation). + References No definition available. + Details
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- Definition The interest rate used to adjust for the time value of money for the plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (k)(1) -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition Amount of employer's best estimate of contributions expected to be paid to the plan during the next fiscal year beginning after the date of the latest statement of financial position. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920 + Details
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- Definition This item represents the amount that could be realized under a life insurance contract or contracts owned by the Entity as of the date of the statement of financial position. Such Entity-owned life insurance policies are commonly known as corporate-owned life insurance (COLI) or bank-owned life insurance (BOLI). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.12) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 325 -SubTopic 30 -Section 25 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6384206&loc=d3e41899-111602 + Details
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- Definition The amount of cash or cash equivalents contributed during the reporting period by the entity to fund non-pension postretirement benefits. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 25 -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3536-108585 + Details
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- Definition For a classified balance sheet, the amount recognized in balance sheet as a current liability associated with an underfunded defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Current Liabilities -URI http://asc.fasb.org/extlink&oid=6509677 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=21915240&loc=d3e1703-114919 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920 + Details
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