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Pension Plans and Other Postretirement Benefits - Additional Information (Details) - USD ($) $ in Thousands |  | 12 Months Ended
--- | --- | ---
Jan. 01, 2017 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2005
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Accumulated benefit obligation for defined benefit pension plans |  |  | $ 901,400 | $ 916,700 |  |
Post retirement medical benefit available to U.S. employees, change of age group, current range |  |  |  |  |  | under age 50
Age group for capping of retiree medical premium |  |  |  |  |  | age 50 and above
Transfers between fair value level 1 and level 2 |  |  | $ 0 |  |  |
Percentage of defined benefit plan assets in U.S. and U.K. |  |  | 98.00% |  |  |
Change in percentage of broad asset class targets |  |  | 10.00% |  |  |
Pension and postretirement contributions |  |  | $ 20,068 | $ 21,613 | $ 13,916 |
Assumed rate of increase in the pre-65 per capita cost of covered health care benefits for U.S. retirees |  |  | 0.00% |  |  |
Assumed rate of increase in the post-65 per capita cost of covered health care benefits for U.S. retirees |  |  | 0.00% |  |  |
Defined contribution plan, employer matching contribution percentage |  |  | 5.00% |  |  |
U.S. Pension Plans |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Weighted-average expected rate of return on plan assets |  |  | 6.89% | 6.88% | 6.91% |
Projected benefit obligation recognized |  |  | $ 665,688 | $ 682,839 | $ 729,652 |
Foreign Pension Plans |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Weighted-average expected rate of return on plan assets |  |  | 6.66% | 5.76% | 4.00% |
Projected benefit obligation recognized |  |  | $ 246,280 | $ 245,747 | $ 53,112 |
Other Postretirement Benefits |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Weighted-average expected rate of return on plan assets |  |  | 7.00% | 7.00% | 7.00% |
Projected benefit obligation recognized |  |  | $ 56,141 | $ 56,499 | $ 64,500 |
Supplemental Executive Retirement Plan |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Costs (credits) related to supplemental executive retirement plan |  |  | 1,600 | (2,100) | 7,300 |
Projected benefit obligation recognized |  |  | 23,500 | 23,100 |  |
2004 Defined Contribution Plan | U.S. Postretirement Benefit Plan |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Defined contribution plan, employer contributions |  |  | 15,100 | 12,800 | 8,400 |
Employee Savings Plan | U.S. Postretirement Benefit Plan |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Defined contribution plan, employer contributions |  |  | 12,700 | 11,700 | 10,000 |
Employee Savings Plan | Foreign Postretirement Benefit Plan |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Defined contribution plan, employer contributions |  |  | $ 9,500 | $ 7,200 | $ 10,100 |
Subsequent Event | U.S. Pension Plans |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Weighted-average expected rate of return on plan assets | 6.89% |  |  |  |  |
Subsequent Event | Foreign Pension Plans |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Weighted-average expected rate of return on plan assets | 6.16% |  |  |  |  |
Subsequent Event | Other Postretirement Benefits |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Weighted-average expected rate of return on plan assets | 7.00% |  |  |  |  |
Scenario, Forecast | Total Pension Benefits |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Expected contributions to benefit plans in 2017 |  | $ 10,000 |  |  |  |
Scenario, Forecast | Other Postretirement Benefits |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Expected premium contribution |  | 3,000 |  |  |  |
Scenario, Forecast | Supplemental Executive Retirement Plan |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Expected contributions to benefit plans in 2017 |  | $ 1,100 |  |  |  |

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- Definition For defined benefit pension plans, the actuarial present value of benefits (whether vested or nonvested) attributed by the pension benefit formula to employee service rendered before a specified date and based on employee service and compensation (if applicable) before that date. The accumulated benefit obligation differs from the projected benefit obligation in that it includes no assumption about future compensation levels. For plans with flat-benefit or nonpay-related pension benefit formulas, the accumulated benefit obligation and the projected benefit obligation are the same. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Accumulated Benefit Obligation -URI http://asc.fasb.org/extlink&oid=6503844 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e1928-114920 + Details
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- Definition An assumption as to the rate of return on plan assets reflecting the average rate of earnings expected on the funds invested or to be invested to provide for the benefits included in the benefit obligation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Expected Long-Term Rate of Return on Plan Assets -URI http://asc.fasb.org/extlink&oid=6512046 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (k)(3) -URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e1928-114920 + Details
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- Definition 1) For defined benefit pension plans, the benefit obligation is the projected benefit obligation, which is the actuarial present value as of a date of all benefits attributed by the pension benefit formula to employee service rendered prior to that date. 2) For other postretirement defined benefit plans, the benefit obligation is the accumulated postretirement benefit obligation, which is the actuarial present value of benefits attributed to employee service rendered to a particular date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Projected Benefit Obligation -URI http://asc.fasb.org/extlink&oid=6522206 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Accumulated Postretirement Benefit Obligation -URI http://asc.fasb.org/extlink&oid=6503904 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition Amount of employer's best estimate of contributions expected to be paid to the plan during the next fiscal year beginning after the date of the latest statement of financial position. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e1928-114920 + Details
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- Definition The amount of the cost recognized during the period for defined contribution plans. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 70 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=49170846&loc=d3e28014-114942 + Details
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- Definition Percentage of employees' gross pay for which the employer contributes a matching contribution to a defined contribution plan. + References No definition available. + Details
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- Definition Amount of transfers of assets measured on a recurring basis out of Level 1 of the fair value hierarchy into Level 2. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bb) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 + Details
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- Definition The amount of cash or cash equivalents contributed during the reporting period by the entity to fund its pension plans and its non-pension postretirement benefit plans. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 25 -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3536-108585 + Details
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