Benefit Plans - Actual Overall Asset Allocation for U.S. And Non-U.S. Plans as Compared to Investment Policy Goals (Detail)	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Target Allocation
Asset allocation	99.00%
U.S. Pension Plans | Fixed income
Plan Assets
Asset allocation	99.00%	98.00%
Target Allocation
Asset allocation	100.00%	100.00%
U.S. Pension Plans | Alternative
Plan Assets
Asset allocation	1.00%	2.00%
Target Allocation
Asset allocation	0.00%	0.00%
Non-US Pension Plans | Equity securities
Plan Assets
Asset allocation	23.00%	23.00%
Target Allocation
Asset allocation	23.00%	22.00%
Non-US Pension Plans | Fixed income
Plan Assets
Asset allocation	46.00%	46.00%
Target Allocation
Asset allocation	48.00%	48.00%
Non-US Pension Plans | Alternative
Plan Assets
Asset allocation	26.00%	27.00%
Target Allocation
Asset allocation	27.00%	28.00%
Non-US Pension Plans | Cash
Plan Assets
Asset allocation	5.00%	4.00%
Target Allocation
Asset allocation	2.00%	2.00%