Postretirement Benefit Plans - Weighted-Average Assumptions used to Determine Benefit Obligations (Detail)	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Cost Assumptions:
Expected return on plan assets	7.20%	8.00%	8.00%
U.S. Pension Plans [Member]
Obligation Assumptions:
Discount rate	4.20%	4.30%
Cost Assumptions:
Discount rate	4.30%	4.00%
Expected return on plan assets	7.20%	8.00%
International Pension Plan [Member]
Obligation Assumptions:
Discount rate	1.70%	2.30%
Rate of future compensation increase	3.40%	3.40%
Cost Assumptions:
Discount rate	2.30%	1.90%
Expected return on plan assets	4.80%	4.80%
Other Postretirement Benefit Plan [Member]
Obligation Assumptions:
Discount rate	4.10%	4.10%
Cost Assumptions:
Discount rate	4.10%	3.80%
Expected return on plan assets	7.20%	8.00%