| Compensation and Retirement Disclosure [Abstract] | Period [Axis] |
|---|
2016-01-01 - 2016-12-31 |
|---|
Compensation and Retirement Disclosure [Abstract] | |
Changes in Benefit Obligation | Changes in benefit obligations for the years ended December 31, 2016 and 2015 were: | | | | | | | | | | 2016 | | 2015 | | (In Thousands) | Changes in benefit obligation | | | | Benefit obligation at beginning of year | $ | 2,199,356 |
| | $ | 2,352,094 |
| Service cost | 7,746 |
| | 8,562 |
| Interest cost | 104,485 |
| | 98,088 |
| Plan participants’ contributions | 2,585 |
| | 2,838 |
| Actuarial loss (gain) | 139,851 |
| | (139,573 | ) | Foreign currency exchange rate changes | 5,449 |
| | (35,082 | ) | Gross benefits paid | (154,676 | ) | | (87,571 | ) | Plan amendments | 2,063 |
| | — |
| Benefit obligation at end of year | $ | 2,306,859 |
| | $ | 2,199,356 |
|
|
Assumptions Used to Measure Pension Benefit Obligations | The assumptions used to measure the pension benefit obligations for the plans at December 31, 2016 and 2015, were: | | | | | | | | 2016 | | 2015 | Weighted-average discount rate | 4.26 | % | | 4.82 | % | Rate of increase in future compensation levels | 3.14 | % | | 3.12 | % |
|
Changes in Plan Assets | Changes in plan assets for the years ended December 31, 2016 and 2015 were: | | | | | | | | | | 2016 | | 2015 | | (In Thousands) | Changes in plan assets | | | | Fair value of plan assets at beginning of year | $ | 1,912,736 |
| | $ | 2,021,837 |
| Actual return on plan assets | 146,022 |
| | (45,529 | ) | Foreign currency exchange rate changes | 5,172 |
| | (33,382 | ) | Employer contributions | 53,663 |
| | 54,543 |
| Plan participants’ contributions | 2,585 |
| | 2,838 |
| Benefits paid | (154,676 | ) | | (87,571 | ) | Fair value of plan assets at end of year | $ | 1,965,502 |
| | $ | 1,912,736 |
|
|
Schedule of Benefit Obligations in Excess of Fair Value of Plan Assets | For the years ended December 31, 2016 and 2015, the aggregate benefit obligation and aggregate fair value of plan assets for plans with benefit obligations in excess of plan assets were as follows: | | | | | | | | | | 2016 | | 2015 | | (In Thousands) | Aggregate benefit obligation | $ | 2,131,550 |
| | $ | 2,186,412 |
| Aggregate fair value of plan assets | 1,783,472 |
| | 1,896,456 |
|
|
Schedule of Accumulated Benefit Obligations in Excess of Fair Value of Plan Assets | For the years ended December 31, 2016 and 2015, the aggregate accumulated benefit obligation and aggregate fair value of plan assets for plans with accumulated benefit obligations in excess of plan assets were as follows: | | | | | | | | | | 2016 | | 2015 | | (In Thousands) | Aggregate accumulated benefit obligation | $ | 2,086,711 |
| | $ | 2,167,216 |
| Aggregate fair value of plan assets | 1,760,713 |
| | 1,896,456 |
|
|
Asset Allocations for Funded Pension Plans | The asset allocations for the Company’s funded pension plans at December 31, 2016 and 2015, and the target allocation for 2017, by asset category were: | | | | | | | | | | | Target Allocation 2017 | | Percentage of Plan Assets at December 31 | | 2016 | | 2015 | Asset Category | | | | | | Equity securities | 71 | % | | 70 | % | | 69 | % | Debt securities | 29 | % | | 30 | % | | 31 | % | | 100 | % | | 100 | % | | 100 | % |
|
Fair Value of Plan Assets by Asset Category | | | | | | | | | | | | | | | | | | | | | | | 2016 | | Total | | Assets Measured at NAV | | Quoted Prices in Active Markets for Identical Assets (Level 1) | | Significant Observable Inputs (Level 2) | | Significant Unobservable Inputs (Level 3) | | (In Thousands) | Equity Securities | | | | | | | | | | Common stocks — mutual funds — equity | $ | 384,103 |
| | $ | 114,182 |
| | $ | 269,921 |
| | $ | — |
| | $ | — |
| Genuine Parts Company common stock | 192,841 |
| | — |
| | 192,841 |
| | — |
| | — |
| Other stocks | 793,101 |
| | — |
| | 793,007 |
| | — |
| | 94 |
| | | | | | | | | | | Debt Securities | | | | | | | | | | Short-term investments | 55,607 |
| | — |
| | 55,607 |
| | — |
| | — |
| Cash and equivalents | 15,995 |
| | — |
| | 15,995 |
| | — |
| | — |
| Government bonds | 157,303 |
| | — |
| | 102,468 |
| | 54,835 |
| | — |
| Corporate bonds | 192,457 |
| | — |
| | — |
| | 192,457 |
| | — |
| Asset-backed and mortgage–backed securities | 8,872 |
| | — |
| | — |
| | 8,872 |
| | — |
| Convertible securities | 216 |
| | — |
| | — |
| | 216 |
| | — |
| Other-international | 24,613 |
| | — |
| | 20,868 |
| | 3,745 |
| | — |
| Municipal bonds | 9,272 |
| | — |
| | — |
| | 9,272 |
| | — |
| Mutual funds—fixed income | 128,367 |
| | 82,394 |
| | — |
| | 45,973 |
| | — |
| | | | | | | | | | | Other | | | | | | | | | | Cash surrender value of life insurance policies | 2,755 |
| | — |
| | — |
| | — |
| | 2,755 |
| Total | $ | 1,965,502 |
| | $ | 196,576 |
| | $ | 1,450,707 |
| | $ | 315,370 |
| | $ | 2,849 |
|
| | | | | | | | | | | | | | | | | | | | | | 2015 | | Total | | Assets Measured at NAV | | Quoted Prices in Active Markets for Identical Assets (Level 1) | | Significant Observable Inputs (Level 2) | | Significant Unobservable Inputs (Level 3) | | (In Thousands) | Equity Securities | | | | | | | | | | Common stocks — mutual funds — equity | $ | 349,852 |
| | $ | 107,441 |
| | $ | 242,411 |
| | $ | — |
| | $ | — |
| Genuine Parts Company common stock | 173,363 |
| | — |
| | 173,363 |
| | — |
| | — |
| Other stocks | 793,229 |
| | — |
| | 792,624 |
| | — |
| | 605 |
| | | | | | | | | | | Debt Securities | | | | | | | | | | Short-term investments | 46,195 |
| | — |
| | 46,195 |
| | — |
| | — |
| Cash and equivalents | 2,978 |
| | — |
| | 2,978 |
| | — |
| | — |
| Government bonds | 193,436 |
| | — |
| | 109,559 |
| | 83,877 |
| | — |
| Corporate bonds | 172,119 |
| | — |
| | — |
| | 172,119 |
| | — |
| Asset-backed and mortgage–backed securities | 27,510 |
| | — |
| | — |
| | 27,510 |
| | — |
| Convertible securities | 434 |
| | — |
| | — |
| | 434 |
| | — |
| Other-international | 21,137 |
| | — |
| | 20,785 |
| | 352 |
| | — |
| Municipal bonds | 5,857 |
| | — |
| | — |
| | 5,857 |
| | — |
| Mutual funds—fixed income | 123,895 |
| | 83,241 |
| | — |
| | 40,654 |
| | — |
| | | | | | | | | | | Other | | | | | | | | | | Cash surrender value of life insurance policies | 2,731 |
| | — |
| | — |
| | — |
| | 2,731 |
| Total | $ | 1,912,736 |
| | $ | 190,682 |
| | $ | 1,387,915 |
| | $ | 330,803 |
| | $ | 3,336 |
|
|
Amounts Recognized in Consolidated Balance Sheets | The following table sets forth the funded status of the plans and the amounts recognized in the consolidated balance sheets at December 31: | | | | | | | | | | 2016 | | 2015 | | (In Thousands) | Other long-term asset | $ | 6,721 |
| | $ | 3,336 |
| Other current liability | (8,206 | ) | | (7,432 | ) | Pension and other post-retirement liabilities | (339,872 | ) | | (282,524 | ) | | $ | (341,357 | ) | | $ | (286,620 | ) |
|
Amounts Recognized In Accumulated Other Comprehensive Loss Table | Amounts recognized in accumulated other comprehensive loss consist of: | | | | | | | | | | 2016 | | 2015 | | (In Thousands) | Net actuarial loss | $ | 1,003,247 |
| | $ | 882,464 |
| Prior service cost (credit) | 672 |
| | (1,814 | ) | | $ | 1,003,919 |
| | $ | 880,650 |
|
|
Expected Cash Flows for Pension Plans | Information about the expected cash flows for the pension plans follows (in thousands): | | | | | Employer contribution | | 2017 (expected) | $ | 48,000 |
| Expected benefit payments: | | 2017 | $ | 109,000 |
| 2018 | 116,000 |
| 2019 | 122,000 |
| 2020 | 127,000 |
| 2021 | 133,000 |
| 2022 through 2026 | 721,000 |
|
|
Components of Net Periodic Benefit (Income) Cost | Net periodic benefit income included the following components: | | | | | | | | | | | | | | 2016 | | 2015 | | 2014 | | (In Thousands) | Service cost | $ | 7,746 |
| | $ | 8,562 |
| | $ | 7,824 |
| Interest cost | 104,485 |
| | 98,088 |
| | 102,465 |
| Expected return on plan assets | (156,832 | ) | | (150,130 | ) | | (144,746 | ) | Amortization of prior service credit | (432 | ) | | (565 | ) | | (1,890 | ) | Amortization of actuarial loss | 31,641 |
| | 38,197 |
| | 26,791 |
| Net periodic benefit income | $ | (13,392 | ) | | $ | (5,848 | ) | | $ | (9,556 | ) |
|
Other Changes in Plan Assets and Benefit Obligations Recognized in Other Comprehensive Income (Loss) | Other changes in plan assets and benefit obligations recognized in other comprehensive income (loss) are as follows: | | | | | | | | | | | | | | 2016 | | 2015 | | 2014 | | (In Thousands) | Current year actuarial loss | $ | 152,415 |
| | $ | 44,930 |
| | $ | 312,011 |
| Recognition of actuarial loss | (31,641 | ) | | (38,197 | ) | | (26,791 | ) | Current year prior service cost | 2,063 |
| | — |
| | — |
| Recognition of prior service credit | 432 |
| | 565 |
| | 638 |
| Total recognized in other comprehensive income (loss) | $ | 123,269 |
| | $ | 7,298 |
|
| $ | 285,858 |
| Total recognized in net periodic benefit income and other comprehensive income (loss) | $ | 109,877 |
| | $ | 1,450 |
| | $ | 276,303 |
|
|
Estimated Amounts Amortized from Accumulated Other Comprehensive Loss | The estimated amounts that will be amortized from accumulated other comprehensive loss into net periodic benefit income in 2017 are as follows in thousands: | | | | | Actuarial loss | $ | 37,870 |
| Prior service credit | (349 | ) | Total | $ | 37,521 |
|
|
Assumptions Used To Measure Net Periodic Benefit (Income) Cost | The assumptions used in measuring the net periodic benefit income for the plans follow: | | | | | | | | | | | 2016 | | 2015 | | 2014 | Weighted average discount rate | 4.82 | % | | 4.26 | % | | 5.10 | % | Rate of increase in future compensation levels | 3.12 | % | | 3.07 | % | | 3.04 | % | Expected long-term rate of return on plan assets | 7.83 | % | | 7.85 | % | | 7.85 | % |
|