Summary Of Assumptions Used To Determine Pension Obligations And Pension Costs (Detail)	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
United States Pension Plan of US Entity [Member]
Defined Benefit Plan Disclosure [Line Items]
Net periodic benefit cost	4.40%	4.00%	4.75%
Benefit obligation	3.90%	4.40%	4.00%
Long-term rate of return on plan assets	7.00%	7.25%	7.50%
Foreign Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Net periodic benefit cost	3.45%	3.30%	4.50%
Benefit obligation	2.45%	3.45%	3.30%
Long-term rate of return on plan assets	4.45%	4.65%	5.30%