Employee Benefits - Percentage of Assets Invested (Detail)	Dec. 31, 2012	Dec. 31, 2011
U.S. Pension Plans [Member] | Cash Equivalents [Member]
Defined Benefit Plan Disclosure [Line Items]
Percentage of assets invested	1.00%	2.00%
U.S. Pension Plans [Member] | Equity Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Percentage of assets invested	50.00%	50.00%
U.S. Pension Plans [Member] | Fixed income [Member]
Defined Benefit Plan Disclosure [Line Items]
Percentage of assets invested	49.00%	48.00%
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] | Other Investment Companies [Member]
Defined Benefit Plan Disclosure [Line Items]
Percentage of assets invested	0.00%	0.00%
Non-U.S. Pension Plans [Member] | Cash Equivalents [Member]
Defined Benefit Plan Disclosure [Line Items]
Percentage of assets invested	2.00%	1.00%
Non-U.S. Pension Plans [Member] | Equity Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Percentage of assets invested	22.00%	22.00%
Non-U.S. Pension Plans [Member] | Fixed income [Member]
Defined Benefit Plan Disclosure [Line Items]
Percentage of assets invested	59.00%	59.00%
Non-U.S. Pension Plans [Member] | Real Estate [Member]
Defined Benefit Plan Disclosure [Line Items]
Percentage of assets invested	9.00%	10.00%
Non-U.S. Pension Plans [Member] | Other Investment Companies [Member]
Defined Benefit Plan Disclosure [Line Items]
Percentage of assets invested	8.00%	8.00%