XML 40 R27.htm IDEA: XBRL DOCUMENT
v3.6.0.2

Comprehensive Income (Tables) | 12 Months Ended
--- | ---
Dec. 31, 2016
Comprehensive Income [Abstract] |
Schedule of Accumulated Other Comprehensive Income (Loss) | Comprehensive income reflects the change in equity of a business enterprise during a period from transactions and other events and circumstances from non-owner sources. For the Company, comprehensive income represents net income adjusted for unrealized gains and losses on certain investments, foreign currency translation adjustments, and unrealized movement in derivative financial instruments designated as hedges.
| For the Twelve Months ended December 31,
| 2016 |  | 2015 |  | 2014
Foreign currency translation adjustments: |  |  |  |  |
Balance at beginning of period | $ | (44,909 | ) |  | $ | 1,403,899 |  |  | $ | 2,507,922 |
Other comprehensive loss before reclassifications | (2,818,090 | ) |  | (1,448,808 | ) |  | (1,104,023 | )
Net current-period change | (2,818,090 | ) |  | (1,448,808 | ) |  | (1,104,023 | )
Balance at end of period | (2,862,999 | ) |  | (44,909 | ) |  | 1,403,899 |
Unrealized gains (losses) on available-for-sale securities: |  |  |  |  |
Balance at beginning of period | 829,907 |  |  | 10,868,322 |  |  | 19,467,441 |
Other comprehensive income (loss) before reclassifications | 2,167,196 |  |  | (5,513,842 | ) |  | 1,536,416 |
Amounts reclassified from accumulated other comprehensive income | (208,128 | ) |  | (4,524,573 | ) |  | (10,135,535 | )
Net current-period change | 1,959,068 |  |  | (10,038,415 | ) |  | (8,599,119 | )
Balance at end of period | 2,788,975 |  |  | 829,907 |  |  | 10,868,322 |
Unrealized gains (losses) on derivatives: |  |  |  |  |
Balance at beginning of period | (1,915,834 | ) |  | (959,206 | ) |  | — |
Other comprehensive loss before reclassifications | (672,419 | ) |  | (1,659,115 | ) |  | (959,206 | )
Amounts reclassified from accumulated other comprehensive income | 1,390,972 |  |  | 702,487 |  |  | — |
Net current-period change | 718,553 |  |  | (956,628 | ) |  | (959,206 | )
Balance at end of period | (1,197,281 | ) |  | (1,915,834 | ) |  | (959,206 | )
Accumulated other comprehensive income (loss), end of period | $ | (1,271,305 | ) |  | $ | (1,130,836 | ) |  | $ | 11,313,015 |
All amounts are shown net of tax. Amounts in parentheses indicate debits.
Reclassification out of Accumulated Other Comprehensive Income | The following table presents details of reclassifications out of other comprehensive income for the twelve months ended December 31, 2016, 2015 and 2014.
Details about Accumulated Other Comprehensive Income Components |  |  |  | Affected Line item in the Statement of Consolidated Income
|  | For the Twelve Months ended December 31, |  |
|  | 2016 |  | 2015 |  | 2014 |  |
Unrealized gains and (losses) on available-for-sale securities |  |  |  |  |  |  |  |
Realized gain on sale of securities |  | $ | 320,197 |  |  | $ | 6,960,881 |  |  | $ | 15,593,131 |  |  | Other, net
Provision for Income Taxes |  | (112,069 | ) |  | (2,436,308 | ) |  | (5,457,596 | ) |  | Provision for Income Taxes
Total reclassifications for the period |  | $ | 208,128 |  |  | $ | 4,524,573 |  |  | $ | 10,135,535 |  |  | Net of tax
Unrealized gains (losses) on derivatives |  |  |  |  |  |  |  |
Realized loss on interest rate swap |  | $ | (2,139,958 | ) |  | $ | (1,080,750 | ) |  | $ | — |  |  | Other, net
Provision for Income Taxes |  | 748,986 |  |  | 378,263 |  |  | — |  |  | Provision for Income Taxes
|  | $ | (1,390,972 | ) |  | $ | (702,487 | ) |  | $ | — |  |  | Net of tax
Total reclassifications for the period |  | $ | (1,182,844 | ) |  | $ | 3,822,086 |  |  | $ | 10,135,535 |  |  | Net of tax

X
- Definition Comprehensive Income [Abstract] + References No definition available. + Details
Name: | gntx_ComprehensiveIncomeAbstract
Namespace Prefix: | gntx_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of information about items reclassified out of accumulated other comprehensive income (loss). + References No definition available. + Details
Name: | us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of the components of accumulated other comprehensive income (loss). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=66004124&loc=SL7669686-108580 + Details
Name: | us-gaap_ScheduleOfAccumulatedOtherComprehensiveIncomeLossTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration