Schedule of Weighted Average Pension Asset Allocations by Category (Detail) (Defined Benefit Pension Plans)	Dec. 31, 2012	Dec. 31, 2011
United States Plan
Defined Benefit Plan Disclosure
Fixed Income Securities	100.00%	100.00%
United States Plan | Debt Securities
Defined Benefit Plan Disclosure
Fixed Income Securities	85.80%	86.70%
United States Plan | Equity Securities
Defined Benefit Plan Disclosure
Fixed Income Securities	13.00%	12.30%
United States Plan | Other than Securities Investment
Defined Benefit Plan Disclosure
Fixed Income Securities	1.20%	1.00%
Foreign Plans
Defined Benefit Plan Disclosure
Fixed Income Securities	100.00%	100.00%
Foreign Plans | Debt Securities
Defined Benefit Plan Disclosure
Fixed Income Securities	49.20%	49.70%
Foreign Plans | Equity Securities
Defined Benefit Plan Disclosure
Fixed Income Securities	49.60%	48.30%
Foreign Plans | Other than Securities Investment
Defined Benefit Plan Disclosure
Fixed Income Securities	1.20%	2.00%