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