Retirement Benefits - Additional Information (Detail) $ in Thousands	12 Months Ended
	Dec. 31, 2019 USD ($) Investment	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)
Defined Benefit Plan Disclosure [Line Items]
Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Tax	$ 1,599	$ 3,914	$ (17,131)
Multi employer pension plan contributions	4,785	5,292	6,423
Defined contribution plans contributions charged to expense	$ 14,400	12,000	$ 11,800
Target Allocation	100.00%
Plan assets held under management by single investment company	99.00%
Number of commingled debt and equity index funds | Investment	6
Number of asset funds individually in excess of ten percent of total plan assets | Investment	4
Maximum [Member]
Defined Benefit Plan Disclosure [Line Items]
Multi Employer Funded Status	65.00%
Foreign Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Accumulated benefit obligations in excess of plan assets, projected benefit obligation	$ 109,000	95,600
Accumulated benefit obligations in excess of plan assets, accumulated benefit obligation	$ 103,900	$ 93,100
Benefit obligation discount rate	1.50%	2.20%
Net periodic benefit cost discount rate	2.20%	2.10%	1.90%
Net periodic benefit cost rate of compensation increase	3.30%	3.30%	3.30%
Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Accumulated benefit obligation, pension benefit plans	$ 828,000	$ 728,700
Equity Securities
Defined Benefit Plan Disclosure [Line Items]
Target Allocation	58.00%
Debt securities
Defined Benefit Plan Disclosure [Line Items]
Target Allocation	42.00%
Equity securities—U.S.
Defined Benefit Plan Disclosure [Line Items]
Target Allocation	49.00%
Equity securities, target allocation as percentage of total equity securities	85.00%