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Debt and Financing Arrangements (Details) (USD $) | 0 Months Ended | 3 Months Ended |
--- | --- | --- | ---
Sep. 30, 2013 | Sep. 30, 2013 | Sep. 27, 2013
Base Rate [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Description of variable rate basis | base |  |
Basis spread on variable rate |  |  | 0.50%
LIBOR Rate [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Description of variable rate basis | LIBOR | LIBOR |
Basis spread on variable rate | 1.18% | 1.18% | 1.00%
Minimum [Member] | Base Rate [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Basis spread on variable rate |  |  | 0.00%
Minimum [Member] | LIBOR Rate [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Basis spread on variable rate |  |  | 1.00%
Maximum [Member] | Base Rate [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Basis spread on variable rate |  |  | 0.75%
Maximum [Member] | LIBOR Rate [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Basis spread on variable rate |  |  | 1.75%
Credit Agreement [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Additional principal amount available |  |  | $ 75,000,000
Amount borrowed | 275,000,000 | 275,000,000 |
Available borrowing capacity | 25,000,000 | 25,000,000 |
Revolving Facility [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Principal amount |  |  | 150,000,000
Amount borrowed | 125,000,000 | 125,000,000 |
Term Loan [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Principal amount |  |  | 150,000,000
Amount borrowed | 150,000,000 | 150,000,000 |
Swing Loans [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Additional principal amount available |  |  | 20,000,000
Letters of Credit [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Additional principal amount available |  |  | $ 20,000,000

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- Definition Debt Instrument, Additional Borrowings Available Face Amount + References No definition available. + Details
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Namespace Prefix: | gntx_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition The percentage points added to the reference rate to compute the variable rate on the debt instrument. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

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- Definition Including current and noncurrent portions, aggregate carrying amount of long-term borrowings as of the balance sheet date before deducting unamortized discount or premiums (if any). May include notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt, which had initial maturities beyond one year or beyond the normal operating cycle, if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 20 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 16 -Article 9 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name FASB Staff Position (FSP) -Number APB14-1 -Paragraph 31 -Subparagraph b -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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Balance Type: | credit
Period Type: | instant

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- Definition The reference rate for the variable rate of the debt instrument, such as LIBOR or the US Treasury rate and the maturity of the reference rate used, such as three months or six months LIBOR. + References No definition available. + Details
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Balance Type: | na
Period Type: | duration

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- Definition The stated principal amount of the debt instrument at time of issuance, which may vary from the carrying amount because of unamortized premium or discount. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28551-108399 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6584090&loc=d3e28878-108400 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Principles Board Opinion (APB) -Number 21 -Paragraph 16, 20 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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Period Type: | instant

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- Details
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Balance Type: | na
Period Type: | duration

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- Definition Amount of unused borrowing capacity under the long-term financing arrangement that is available to the entity as of the balance sheet date. + 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 210.5-02.22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Subparagraph b -Article 5 + Details
Name: | us-gaap_DebtInstrumentUnusedBorrowingCapacityAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant