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v2.4.1.9

Consolidated Statement of Shareholders' Investment (USD $) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2014 | Mar. 31, 2014 | Dec. 31, 2013 | Mar. 31, 2013 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |
Beginning balance (in shares) |  | 291,156,046 us-gaap_CommonStockSharesOutstanding |  |  | 291,156,046 us-gaap_CommonStockSharesOutstanding |  |
Beginning balance |  | $ 1,327,603,683 us-gaap_StockholdersEquity |  | $ 1,120,960,556 us-gaap_StockholdersEquity | $ 1,327,603,683 us-gaap_StockholdersEquity | $ 1,120,960,556 us-gaap_StockholdersEquity | $ 1,027,118,521 us-gaap_StockholdersEquity
Issuance of common stock and the tax benefit of stock plan transactions |  |  |  |  | 65,471,344 gntx_IssuanceOfCommonStockAndTaxBenefitOfStockPlanTransactionsValue | 42,822,635 gntx_IssuanceOfCommonStockAndTaxBenefitOfStockPlanTransactionsValue | 12,208,881 gntx_IssuanceOfCommonStockAndTaxBenefitOfStockPlanTransactionsValue
Repurchases of common stock |  |  |  |  | (30,010,882)us-gaap_StockRepurchasedDuringPeriodValue |  | (33,716,725)us-gaap_StockRepurchasedDuringPeriodValue
Stock-based compensation expense related to stock options, employee stock purchases and restricted stock |  |  |  |  | 21,276,991 us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue | 17,427,233 us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue | 16,433,837 us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue
Dividends declared ($.26, $.28, and $.31 per share for the years ended December 31, 2012, 2013 and 2014 respectively) |  |  |  |  | (90,870,922)us-gaap_DividendsCommonStockCash | (80,941,342)us-gaap_DividendsCommonStockCash | (74,699,306)us-gaap_DividendsCommonStockCash
Net Income | 70,975,000 us-gaap_NetIncomeLoss | 68,566,000 us-gaap_NetIncomeLoss | 69,881,000 us-gaap_NetIncomeLoss | 45,431,000 us-gaap_NetIncomeLoss | 288,604,579 us-gaap_NetIncomeLoss | 222,929,949 us-gaap_NetIncomeLoss | 168,586,840 us-gaap_NetIncomeLoss
Other comprehensive income |  |  |  |  | (10,662,348)us-gaap_OtherComprehensiveIncomeLossNetOfTax | 4,404,652 us-gaap_OtherComprehensiveIncomeLossNetOfTax | 5,028,508 us-gaap_OtherComprehensiveIncomeLossNetOfTax
Ending balance (in shares) | 295,247,958 us-gaap_CommonStockSharesOutstanding |  | 291,156,046 us-gaap_CommonStockSharesOutstanding |  | 295,247,958 us-gaap_CommonStockSharesOutstanding | 291,156,046 us-gaap_CommonStockSharesOutstanding |
Ending balance | 1,571,412,445 us-gaap_StockholdersEquity |  | 1,327,603,683 us-gaap_StockholdersEquity |  | 1,571,412,445 us-gaap_StockholdersEquity | 1,327,603,683 us-gaap_StockholdersEquity | 1,120,960,556 us-gaap_StockholdersEquity
Common Stocks |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |
Beginning balance (in shares) |  | 291,156,046 us-gaap_CommonStockSharesOutstanding / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  | 286,152,714 us-gaap_CommonStockSharesOutstanding / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 291,156,046 us-gaap_CommonStockSharesOutstanding / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 286,152,714 us-gaap_CommonStockSharesOutstanding / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 288,139,126 us-gaap_CommonStockSharesOutstanding / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember
Beginning balance |  | 17,469,362 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  | 17,169,162 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 17,469,362 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 17,169,162 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 17,288,348 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember
Issuance of common stock and the tax benefit of stock plan transactions (in shares) |  |  |  |  | 5,889,392 gntx_IssuanceOfCommonStockAndTaxBenefitOfStockPlanTransactionsShares / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 5,003,332 gntx_IssuanceOfCommonStockAndTaxBenefitOfStockPlanTransactionsShares / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 1,957,246 gntx_IssuanceOfCommonStockAndTaxBenefitOfStockPlanTransactionsShares / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember
Issuance of common stock and the tax benefit of stock plan transactions |  |  |  |  | 353,362 gntx_IssuanceOfCommonStockAndTaxBenefitOfStockPlanTransactionsValue / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 300,200 gntx_IssuanceOfCommonStockAndTaxBenefitOfStockPlanTransactionsValue / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 117,434 gntx_IssuanceOfCommonStockAndTaxBenefitOfStockPlanTransactionsValue / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember
Repurchases of common stock (in shares) |  |  |  |  | (1,797,480)us-gaap_StockRepurchasedDuringPeriodShares / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  | (3,943,658)us-gaap_StockRepurchasedDuringPeriodShares / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember
Repurchases of common stock |  |  |  |  | (107,847)us-gaap_StockRepurchasedDuringPeriodValue / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  | (236,620)us-gaap_StockRepurchasedDuringPeriodValue / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember
Ending balance (in shares) | 295,247,958 us-gaap_CommonStockSharesOutstanding / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  | 291,156,046 us-gaap_CommonStockSharesOutstanding / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  | 295,247,958 us-gaap_CommonStockSharesOutstanding / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 291,156,046 us-gaap_CommonStockSharesOutstanding / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 286,152,714 us-gaap_CommonStockSharesOutstanding / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember
Ending balance | 17,714,877 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  | 17,469,362 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  | 17,714,877 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 17,469,362 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 17,169,162 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember
Additional Paid-In Capital |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |
Beginning balance |  | 470,131,097 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  | 410,181,429 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember | 470,131,097 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember | 410,181,429 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember | 386,585,717 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember
Issuance of common stock and the tax benefit of stock plan transactions |  |  |  |  | 65,117,982 gntx_IssuanceOfCommonStockAndTaxBenefitOfStockPlanTransactionsValue / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember | 42,522,435 gntx_IssuanceOfCommonStockAndTaxBenefitOfStockPlanTransactionsValue / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember | 12,091,447 gntx_IssuanceOfCommonStockAndTaxBenefitOfStockPlanTransactionsValue / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember
Repurchases of common stock |  |  |  |  | (2,689,587)us-gaap_StockRepurchasedDuringPeriodValue / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  | (4,929,572)us-gaap_StockRepurchasedDuringPeriodValue / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember
Stock-based compensation expense related to stock options, employee stock purchases and restricted stock |  |  |  |  | 21,276,991 us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember | 17,427,233 us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember | 16,433,837 us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember
Ending balance | 553,836,483 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  | 470,131,097 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  | 553,836,483 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember | 470,131,097 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember | 410,181,429 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember
Retained Earnings |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |
Beginning balance |  | 818,027,861 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |  | 676,039,254 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | 818,027,861 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | 676,039,254 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | 610,702,253 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember
Repurchases of common stock |  |  |  |  | (27,213,448)us-gaap_StockRepurchasedDuringPeriodValue / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |  | (28,550,533)us-gaap_StockRepurchasedDuringPeriodValue / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember
Dividends declared ($.26, $.28, and $.31 per share for the years ended December 31, 2012, 2013 and 2014 respectively) |  |  |  |  | (90,870,922)us-gaap_DividendsCommonStockCash / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | (80,941,342)us-gaap_DividendsCommonStockCash / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | (74,699,306)us-gaap_DividendsCommonStockCash / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember
Net Income |  |  |  |  | 288,604,579 us-gaap_NetIncomeLoss / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | 222,929,949 us-gaap_NetIncomeLoss / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | 168,586,840 us-gaap_NetIncomeLoss / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember
Ending balance | 988,548,070 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |  | 818,027,861 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |  | 988,548,070 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | 818,027,861 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | 676,039,254 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember
Accumulated Other Comprehensive Income (Loss) |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |
Beginning balance |  | 21,975,363 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember |  | 17,570,711 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | 21,975,363 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | 17,570,711 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | 12,542,203 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember
Other comprehensive income |  |  |  |  | (10,662,348)us-gaap_OtherComprehensiveIncomeLossNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | 4,404,652 us-gaap_OtherComprehensiveIncomeLossNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | 5,028,508 us-gaap_OtherComprehensiveIncomeLossNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember
Ending balance | $ 11,313,015 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember |  | $ 21,975,363 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember |  | $ 11,313,015 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | $ 21,975,363 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | $ 17,570,711 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember

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