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Pension Plans and Other Postretirement Benefits - Additional Information (Details) - USD ($) $ in Thousands |  | 12 Months Ended
--- | --- | ---
Jan. 01, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2005
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Accumulated benefit obligation for defined benefit pension plans |  | $ 949,000 | $ 901,400 |  |
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
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 |  | $ 13,341 | $ 20,068 | $ 21,613 |
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% |  |  |
Transfers between fair value Level 1 and Level 2 |  | $ 0 |  |  |
Pension Plans |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Expected contributions to benefit plans in 2018 |  | $ 13,000 |  |  |
Other Postretirement Benefits |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Weighted-average expected rate of return on plan assets |  | 7.00% | 7.00% | 7.00% |
Expected premium contribution |  | $ 3,000 |  |  |
Projected benefit obligation recognized |  | 56,647 | $ 56,141 | $ 56,499 |
Supplemental Executive Retirement Plan |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Expected contributions to benefit plans in 2018 |  | 1,300 |  |  |
Costs (credits) related to supplemental executive retirement plan |  | 2,600 | 1,600 | $ (2,100) |
Projected benefit obligation recognized |  | $ 24,800 | $ 23,500 |  |
Subsequent Event | Other Postretirement Benefits |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Weighted-average expected rate of return on plan assets | 7.00% |  |  |  |
U.S. Plans | Pension Plans |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Weighted-average expected rate of return on plan assets |  | 6.89% | 6.89% | 6.88% |
Projected benefit obligation recognized |  | $ 685,963 | $ 665,688 | $ 682,839 |
Defined contribution plan, employer matching contribution percentage |  | 5.00% |  |  |
U.S. Plans | 2004 Defined Contribution Plan | Pension Plans |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Defined contribution plan, employer contributions |  | $ 10,300 | 15,100 | 12,800 |
U.S. Plans | Employee Savings Plan | Pension Plans |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Defined contribution plan, employer contributions |  | $ 11,300 | $ 12,700 | $ 11,700 |
U.S. Plans | Subsequent Event | Pension Plans |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Weighted-average expected rate of return on plan assets | 6.89% |  |  |  |
Foreign Plans | Pension Plans |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Weighted-average expected rate of return on plan assets |  | 6.16% | 6.66% | 5.76% |
Projected benefit obligation recognized |  | $ 275,006 | $ 246,280 | $ 245,747 |
Foreign Plans | Employee Savings Plan | Pension Plans |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Defined contribution plan, employer contributions |  | $ 9,900 | $ 9,500 | $ 7,200 |
Foreign Plans | Subsequent Event | Pension Plans |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Weighted-average expected rate of return on plan assets | 5.52% |  |  |  |

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- Definition Amount of actuarial present value of benefits attributed to employee service rendered, excluding assumptions about future compensation level. + 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 (e) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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