Schedule of Weighted Average Assumptions to Determine Pension Obligations (Detail)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Post-Retirement Benefit Plans
Schedule of Benefit Obligations Weighted Average Assumptions [Line Items]
Discount rate	3.10%	3.70%	4.50%
Initial Medical Trend	8.50%	9.00%	8.50%
Ultimate Health Care Trend	5.00%	5.00%	5.00%
Medical cost trend rate decrease to ultimate rate in year	2018	2018	2018
United States Plans
Schedule of Benefit Obligations Weighted Average Assumptions [Line Items]
Discount rate	3.60%	4.20%
United States Plans | Defined Benefit Pension Plans
Schedule of Benefit Obligations Weighted Average Assumptions [Line Items]
Discount rate	3.60%	4.20%
Salary progression rate	3.00%	3.00%
Foreign Plans | Defined Benefit Pension Plans
Schedule of Benefit Obligations Weighted Average Assumptions [Line Items]
Discount rate	3.70%	4.90%
Salary progression rate	3.50%	3.40%