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Employee Benefit Plans (Tables) | 12 Months Ended
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Dec. 31, 2020
Defined Benefit Plans and Other Postretirement Benefit Plans Disclosures [Abstract] |
Schedule of Defined Benefit Plans Disclosures [Table Text Block] | The following tables summarize the change in benefit obligations, change in plan assets, and funded status associated with the Company's significant defined benefit plans and the amounts recognized in the consolidated balance sheets at December 31, 2020 and 2019:
| Qualified Defined Benefits |  | Non-Qualified Supplemental Benefits |  |
| U.S. Plan |  | Non-U.S. Plans |  |
| 2020 |  | 2019 |  | 2020 |  | 2019 |  | 2020 |  | 2019 |  |  |  |
Change in benefit obligation: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Benefit obligation at beginning of year | $ | 490,228 |  |  | $ | 447,173 |  |  | $ | 296,534 |  |  | $ | 270,329 |  |  | $ | 60,183 |  |  | $ | 66,836 |  |  |  |  |
Service cost | 6,824 |  |  | 7,016 |  |  | 5,345 |  |  | 5,665 |  |  | 1,272 |  |  | 1,942 |  |  |  |  |
Interest cost | 16,272 |  |  | 19,026 |  |  | 3,697 |  |  | 5,101 |  |  | 1,765 |  |  | 2,670 |  |  |  |  |
Plan participants' contributions | — |  |  | — |  |  | 1,707 |  |  | 1,681 |  |  | — |  |  | — |  |  |  |  |
Benefits paid | (36,303) |  |  | (38,093) |  |  | (8,613) |  |  | (9,298) |  |  | (12,324) |  |  | (13,617) |  |  |  |  |
Actuarial loss(1) | 47,160 |  |  | 55,105 |  |  | 19,558 |  |  | 24,791 |  |  | 298 |  |  | 2,352 |  |  |  |  |
Amendments | — |  |  | — |  |  | (1,401) |  |  | — |  |  | — |  |  | — |  |  |  |  |
Settlements and curtailments | — |  |  | — |  |  | (294) |  |  | (5,412) |  |  | — |  |  | — |  |  |  |  |
Currency translation and other | — |  |  | 1 |  |  | 24,296 |  |  | 3,677 |  |  | — |  |  | — |  |  |  |  |
Benefit obligation at end of year | 524,181 |  |  | 490,228 |  |  | 340,829 |  |  | 296,534 |  |  | 51,194 |  |  | 60,183 |  |  |  |  |
Change in plan assets: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair value of plan assets at beginning of year | 550,238 |  |  | 488,900 |  |  | 185,590 |  |  | 162,589 |  |  | — |  |  | — |  |  |  |  |
Actual return on plan assets | 92,961 |  |  | 99,431 |  |  | 13,560 |  |  | 23,812 |  |  | — |  |  | — |  |  |  |  |
Company contributions | — |  |  | — |  |  | 7,315 |  |  | 7,247 |  |  | 12,324 |  |  | 13,617 |  |  |  |  |
Plan participants' contributions | — |  |  | — |  |  | 1,707 |  |  | 1,681 |  |  | — |  |  | — |  |  |  |  |
Benefits paid | (36,303) |  |  | (38,093) |  |  | (8,613) |  |  | (9,298) |  |  | (12,324) |  |  | (13,617) |  |  |  |  |
Settlements and curtailments | — |  |  | — |  |  | (294) |  |  | (4,350) |  |  | — |  |  | — |  |  |  |  |
Currency translation and other | — |  |  | — |  |  | 13,483 |  |  | 3,909 |  |  | — |  |  | — |  |  |  |  |
Fair value of plan assets at end of year | 606,896 |  |  | 550,238 |  |  | 212,748 |  |  | 185,590 |  |  | — |  |  | — |  |  |  |  |
Funded (Unfunded) status | $ | 82,715 |  |  | $ | 60,010 |  |  | $ | (128,081) |  |  | $ | (110,944) |  |  | $ | (51,194) |  |  | $ | (60,183) |  |  |  |  |
Amounts recognized in the consolidated balance sheets consist of: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Assets and Liabilities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other assets and deferred charges | $ | 82,715 |  |  | $ | 60,010 |  |  | $ | 653 |  |  | $ | 671 |  |  | $ | — |  |  | $ | — |  |  |  |  |
Accrued compensation and employee benefits | — |  |  | — |  |  | (1,691) |  |  | (1,526) |  |  | (4,899) |  |  | (12,500) |  |  |  |  |
Other liabilities (deferred compensation) | — |  |  | — |  |  | (127,043) |  |  | (110,089) |  |  | (46,295) |  |  | (47,683) |  |  |  |  |
Total assets and liabilities | 82,715 |  |  | 60,010 |  |  | (128,081) |  |  | (110,944) |  |  | (51,194) |  |  | (60,183) |  |  |  |  |
Accumulated Other Comprehensive Loss (Earnings): |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net actuarial losses (gains) | 49,386 |  |  | 71,247 |  |  | 80,472 |  |  | 70,694 |  |  | (18,400) |  |  | (20,556) |  |  |  |  |
Prior service cost (credit) | 322 |  |  | 549 |  |  | (3,632) |  |  | (2,724) |  |  | 4,593 |  |  | 6,288 |  |  |  |  |
Deferred taxes | (10,272) |  |  | (15,263) |  |  | (17,144) |  |  | (15,492) |  |  | 2,961 |  |  | 3,066 |  |  |  |  |
Total accumulated other comprehensive loss (earnings), net of tax | 39,436 |  |  | 56,533 |  |  | 59,696 |  |  | 52,478 |  |  | (10,846) |  |  | (11,202) |  |  |  |  |
Net amount recognized at December 31, | $ | 122,151 |  |  | $ | 116,543 |  |  | $ | (68,385) |  |  | $ | (58,466) |  |  | $ | (62,040) |  |  | $ | (71,385) |  |  |  |  |
Accumulated benefit obligations | $ | 511,292 |  |  | $ | 476,357 |  |  | $ | 326,317 |  |  | $ | 282,883 |  |  | $ | 47,358 |  |  | $ | 56,017 |  |  |  |  |
Schedule of Accumulated Benefit Obligations in Excess of Fair Value of Plan Assets [Table Text Block] | Pension plans with projected benefit obligations and accumulated benefit obligations in excess of plan assets consist of the following at December 31, 2020 and 2019:
| 2020 |  | 2019
Projected benefit obligation (PBO) | $ | 383,244 |  |  | $ | 348,137 |
Accumulated benefit obligation (ABO) | 364,895 |  |  | 331,126 |
Fair value of plan assets | 203,314 |  |  | 177,057 |
Schedule of Net Benefit Costs [Table Text Block] | Net Periodic Benefit Cost The operating expense component of net periodic benefit cost (service cost) is reported with similar compensation costs in the Company's Consolidated Statement of Earnings. The non-operating components (all other components of net periodic benefit expense, including interest cost, amortization of prior service cost, curtailments and settlements, etc.) are reported outside of operating income in other income, net in the Consolidated Statement of Earnings. Components of the net periodic benefit cost were as follows: Defined Benefit Plans
| Qualified Defined Benefits |  | Non-Qualified Supplemental Benefits
| U.S. Plan |  | Non-U.S. Plans |
| 2020 |  | 2019 |  | 2018 |  | 2020 |  | 2019 |  | 2018 |  | 2020 |  | 2019 |  | 2018
Service cost | $ | 6,824 |  |  | $ | 7,016 |  |  | $ | 9,019 |  |  | $ | 5,345 |  |  | $ | 5,665 |  |  | $ | 5,359 |  |  | $ | 1,272 |  |  | $ | 1,942 |  |  | $ | 2,624 |
Interest cost | 16,272 |  |  | 19,026 |  |  | 20,756 |  |  | 3,697 |  |  | 5,101 |  |  | 4,962 |  |  | 1,765 |  |  | 2,670 |  |  | 3,204 |
Expected return on plan assets | (31,475) |  |  | (34,136) |  |  | (39,045) |  |  | (6,837) |  |  | (6,220) |  |  | (7,675) |  |  | — |  |  | — |  |  | — |
Amortization of: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Prior service cost (credit) | 227 |  |  | 303 |  |  | 298 |  |  | (493) |  |  | (398) |  |  | (449) |  |  | 1,695 |  |  | 2,811 |  |  | 3,770 |
Recognized actuarial loss (gain) | 7,536 |  |  | — |  |  | 3,102 |  |  | 3,047 |  |  | 3,109 |  |  | 2,952 |  |  | (1,857) |  |  | (2,280) |  |  | (1,132) |
Transition obligation | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | 1 |  |  | — |  |  | — |  |  | — |
Settlement and curtailment loss (gain) | — |  |  | — |  |  | 13,939 |  | (1) | 25 |  |  | 961 |  |  | 7 |  |  | — |  |  | — |  |  | (1,381) |
Net periodic (benefit) expense | $ | (616) |  |  | $ | (7,791) |  |  | $ | 8,069 |  |  | $ | 4,784 |  |  | $ | 8,218 |  |  | $ | 5,157 |  |  | $ | 2,875 |  |  | $ | 5,143 |  |  | $ | 7,085 |
Less: Discontinued operations | — |  |  | — |  |  | 10,109 |  | (1) | — |  |  | — |  |  | 114 |  |  | — |  |  | — |  |  | 279 |
Net periodic (income) expense - Continuing operations | $ | (616) |  |  | $ | (7,791) |  |  | $ | (2,040) |  |  | $ | 4,784 |  |  | $ | 8,218 |  |  | $ | 5,043 |  |  | $ | 2,875 |  |  | $ | 5,143 |  |  | $ | 6,806 |
(1) $9.2 million of the total settlement and curtailment loss on the U.S. Plan is attributable to Apergy participants in the Dover Defined Benefit Plan and has therefore been reflected in the results of discontinued operations.
Weighted-average assumptions used in benefit obligations [Table Text Block] | The weighted average assumptions used in determining the benefit obligations were as follows:
| Qualified Defined Benefits |  | Non-Qualified Supplemental Benefits |  |
| U.S. Plan |  | Non-U.S. Plans |  |
| 2020 |  | 2019 |  | 2020 |  | 2019 |  | 2020 |  | 2019 |  |  |  |
Discount rate | 2.65 | % |  | 3.40 | % |  | 0.79 | % |  | 1.18 | % |  | 2.45 | % |  | 3.20 | % |  |  |  |
Average wage increase | 4.00 | % |  | 4.00 | % |  | 1.51 | % |  | 1.80 | % |  | 4.50 | % |  | 4.50 | % |  |  |  |
Weighted-average assumptions used calculating net periodic cost [Table Text Block] | The weighted average assumptions used in determining the net periodic benefit cost were as follows:
| Qualified Defined Benefits |  | Non- Qualified Supplemental Benefits |  |
| U.S. Plan |  | Non-U.S. Plans |
| 2020 |  | 2019 |  | 2018 |  | 2020 |  | 2019 |  | 2018 |  | 2020 |  | 2019 |  | 2018 |  |  |  |  |  |
Discount rate | 3.40 | % |  | 4.35 | % |  | 4.20 | % | / | 3.65 | % | (1) | 1.18 | % |  | 1.83 | % |  | 1.94 | % |  | 3.20 | % |  | 4.30 | % |  | 3.57 | % |  |  |  |  |  |
Average wage increase | 4.00 | % |  | 4.00 | % |  | 4.00 | % |  | 1.80 | % |  | 2.10 | % |  | 2.33 | % |  | 4.50 | % |  | 4.50 | % |  | 4.50 | % |  |  |  |  |  |
Expected return on plan assets | 6.30 | % |  | 6.80 | % |  | 6.80 | % | / | 7.25 | % | (1) | 3.69 | % |  | 3.67 | % |  | 4.66 | % |  | na |  | na |  | na |  |  |  |  |  |
(1) The separation of Apergy triggered a pension plan curtailment which required a re-measurement of the Plan's benefit obligation in the second quarter 2018, assuming a discount rate of 4.2% and an expected return on assets of 6.8%.
Weighted-average asset allocation actual and target [Table Text Block] | The Company’s actual and target weighted average asset allocation for our U.S. Corporate Pension Plan was as follows:
| 2020 |  | 2019 |  | Current Target
Equity securities | 22 | % |  | 34 | % |  | 22 | %
Fixed income | 77 | % |  | 64 | % |  | 78 | %
Other | 1 | % |  | 2 | % |  | — | %
Total | 100 | % |  | 100 | % |  | 100 | %
Schedule of Allocation of Plan Assets [Table Text Block] | The fair values of both U.S. and non-U.S. pension plan assets by asset category within the fair value hierarchy (as defined in Note 14 — Financial Instruments) were as follows:
| U.S. Qualified Defined Benefits Plan
| 12/31/2020 |  | 12/31/2019
| Level 1 |  | Level 2 |  |  |  | Total Fair Value |  | Level 1 |  | Level 2 |  |  |  | Total Fair Value
Corporate bonds | $ | — |  |  | $ | 329,800 |  |  |  |  | $ | 329,800 |  |  | $ | — |  |  | $ | 216,981 |  |  |  |  | $ | 216,981 |
Government securities | 8,533 |  |  | 72,018 |  |  |  |  | 80,551 |  |  | 5,846 |  |  | 69,486 |  |  |  |  | 75,332
Interest-bearing cash and short-term investments | 3,117 |  |  | — |  |  |  |  | 3,117 |  |  | 1,438 |  |  | — |  |  |  |  | 1,438
Total investments at fair value | 11,650 |  |  | 401,818 |  |  |  |  | 413,468 |  |  | 7,284 |  |  | 286,467 |  |  |  |  | 293,751
Investments measured at net asset value* |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Collective funds | — |  |  | — |  |  |  |  | 180,103 |  |  | — |  |  | — |  |  |  |  | 241,058 |
Short-term investment funds | — |  |  | — |  |  |  |  | 13,325 |  |  | — |  |  | — |  |  |  |  | 15,429 |
Total investments | $ | 11,650 |  |  | $ | 401,818 |  |  |  |  | $ | 606,896 |  |  | $ | 7,284 |  |  | $ | 286,467 |  |  |  |  | $ | 550,238 |
| Non-U.S. Plans
| 12/31/2020 |  | 12/31/2019
| Level 1 |  | Level 2 |  | Level 3 |  | Total Fair Value |  | Level 1 |  | Level 2 |  | Level 3 |  | Total Fair Value
Common stocks | $ | 52,865 |  |  | $ | — |  |  | $ | — |  |  | $ | 52,865 |  |  | $ | 44,685 |  |  | $ | — |  |  | $ | — |  |  | $ | 44,685 |
Fixed income investments | — |  |  | 26,068 |  |  | — |  |  | 26,068 |  |  | — |  |  | 19,871 |  |  | — |  |  | 19,871 |
Mutual funds | 29,413 |  |  | — |  |  | — |  |  | 29,413 |  |  | 26,799 |  |  | — |  |  | — |  |  | 26,799 |
Cash and cash equivalents | 2,822 |  |  | — |  |  | — |  |  | 2,822 |  |  | 3,752 |  |  | — |  |  | — |  |  | 3,752 |
Other | — |  |  | 1,181 |  |  | 21,276 |  |  | 22,457 |  |  | — |  |  | 3,519 |  |  | 18,597 |  |  | 22,116 |
Total investments at fair value | 85,100 |  |  | 27,249 |  |  | 21,276 |  |  | 133,625 |  |  | 75,236 |  |  | 23,390 |  |  | 18,597 |  |  | 117,223 |
Investments measured at net asset value* |  |  |  |  |  |  |  |  |  |  |  |
Collective funds | — |  |  | — |  |  | — |  |  | 74,138 |  |  | — |  |  | — |  |  | — |  |  | 64,000 |
Other | — |  |  | — |  |  | — |  |  | 4,985 |  |  | — |  |  | — |  |  | — |  |  | 4,367 |
Total | $ | 85,100 |  |  | $ | 27,249 |  |  | $ | 21,276 |  |  | $ | 212,748 |  |  | $ | 75,236 |  |  | $ | 23,390 |  |  | $ | 18,597 |  |  | $ | 185,590 |
* In accordance with Fair Value Measurement Topic 820 (Subtopic 820-10), certain investments that are measured at fair value using the net asset value per share (or its equivalent) as a practical expedient were not classified in the fair value hierarchy. These are included to permit reconciliation of the fair value hierarchy to the aggregate pension plan assets.
Schedule of Effect of Significant Unobservable Inputs, Changes in Plan Assets [Table Text Block] | The fair value measurement of plan assets using significant unobservable inputs (Level 3) changed during 2019 and 2020, due to the following:
| Level 3
Balance at December 31, 2018 | $ | 21,283 |
Actual return on plan assets: |
Relating to assets still held at December 31, 2019 | 319 |
Relating to assets sold during the period | 14 |
Purchases | 1,615 |
Sales and settlements | (4,971) |
Foreign currency translation | 337 |
Balance at December 31, 2019 | 18,597 |
Actual return on plan assets: |
Relating to assets still held at December 31, 2020 | 349 |
Relating to assets sold during the period | 6 |
Purchases | 1,715 |
Sales and settlements | (1,111) |
Foreign currency translation | 1,720 |
Balance at December 31, 2020 | $ | 21,276 |
Schedule of Expected Benefit Payments [Table Text Block] | Benefit Payments Estimated future benefit payments to retirees, which reflect expected future service, are as follows:
| Qualified Defined Benefits |  | Non-Qualified Supplemental Benefits |  |
| U.S. Plan |  | Non-U.S. Plans |
2021 | $ | 36,044 |  |  | $ | 9,999 |  |  | $ | 4,958 |  |  |
2022 | 37,184 |  |  | 9,944 |  |  | 5,021 |  |  |
2023 | 34,679 |  |  | 11,333 |  |  | 5,406 |  |  |
2024 | 35,863 |  |  | 13,170 |  |  | 7,090 |  |  |
2025 | 33,816 |  |  | 11,375 |  |  | 1,758 |  |  |
2026 - 2030 | 146,262 |  |  | 69,768 |  |  | 22,248 |  |  |

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