Retirement Benefits - Additional Information (Detail) $ in Thousands	12 Months Ended
	Dec. 31, 2016 USD ($) Investment	Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)
Defined Benefit Plan Disclosure [Line Items]
Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Tax	$ 2,829	$ 9,949	$ 14,027
Accumulated benefit obligation, pension benefit plans	697,500	658,400
Multi employer pension plan contributions	6,482	6,715	6,282
Defined contribution plans contributions charged to expense	$ 9,800	9,500	$ 9,000
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
United States
Defined Benefit Plan Disclosure [Line Items]
Equity securities, target allocation as percentage of total equity securities	85.00%
Equity Securities
Defined Benefit Plan Disclosure [Line Items]
Target Allocation	58.00%
Equity Securities | United States
Defined Benefit Plan Disclosure [Line Items]
Target Allocation	49.00%
Debt securities
Defined Benefit Plan Disclosure [Line Items]
Target Allocation	42.00%
Maximum [Member]
Defined Benefit Plan Disclosure [Line Items]
Multi Employer Funded Status	65.00%
Foreign Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Accumulated benefit obligations in excess of plan assets, projected benefit obligation	$ 71,000	60,100
Accumulated benefit obligations in excess of plan assets, accumulated benefit obligation	$ 66,200	$ 55,800
Benefit obligation discount rate	1.90%	2.60%
Benefit obligation rate of compensation increase	3.50%	3.50%
Net periodic benefit cost discount rate	2.60%	2.00%	3.70%
Net periodic benefit cost rate of compensation increase	3.50%	3.50%	3.50%