Employee Benefits - Percentage of Assets Invested (Detail)	Dec. 31, 2014	Dec. 31, 2013
U.S. Pension Plans [Member] | Cash Equivalents [Member]
Defined Benefit Plan Disclosure [Line Items]
Percentage of assets invested	1.00%	1.00%
U.S. Pension Plans [Member] | Equity Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Percentage of assets invested	40.00%	48.00%
U.S. Pension Plans [Member] | Fixed income [Member]
Defined Benefit Plan Disclosure [Line Items]
Percentage of assets invested	59.00%	51.00%
U.S. Pension Plans [Member] | Real Estate [Member]
Defined Benefit Plan Disclosure [Line Items]
Percentage of assets invested	0.00%	0.00%
U.S. Pension Plans [Member] | Alternative and other investments [Member]
Defined Benefit Plan Disclosure [Line Items]
Alternative and other investments	0.00%	0.00%
Non-U.S. Pension Plans [Member] | Cash Equivalents [Member]
Defined Benefit Plan Disclosure [Line Items]
Percentage of assets invested	1.00%	2.00%
Non-U.S. Pension Plans [Member] | Equity Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Percentage of assets invested	26.00%	25.00%
Non-U.S. Pension Plans [Member] | Fixed income [Member]
Defined Benefit Plan Disclosure [Line Items]
Percentage of assets invested	62.00%	59.00%
Non-U.S. Pension Plans [Member] | Real Estate [Member]
Defined Benefit Plan Disclosure [Line Items]
Percentage of assets invested	7.00%	8.00%
Non-U.S. Pension Plans [Member] | Alternative and other investments [Member]
Defined Benefit Plan Disclosure [Line Items]
Alternative and other investments	4.00%	6.00%