Schedule of Weighted Average Assumptions to Determine Net Periodic Pension Cost (Detail)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Post-Retirement Benefit Plans
Schedule of Net Periodic Benefit Costs Weighted Average Assumptions [Line Items]
Discount rate	3.70%	4.50%	5.10%
Initial Health Care Cost Trend Rate	9.00%	8.50%	8.50%
Ultimate Health Care Cost Trend Rate	5.00%	5.00%	5.00%
Year in which Ultimate Health Care Cost Trend Rate is reached	2018	2018	2018
United States Plans
Schedule of Net Periodic Benefit Costs Weighted Average Assumptions [Line Items]
Expected return on plan assets	5.00%
United States Plans | Defined Benefit Pension Plans
Schedule of Net Periodic Benefit Costs Weighted Average Assumptions [Line Items]
Discount rate	4.20%	5.30%	5.80%
Expected return on plan assets	5.00%	5.50%	7.50%
Salary progression rate	3.00%	4.00%	4.00%
Foreign Plans | Defined Benefit Pension Plans
Schedule of Net Periodic Benefit Costs Weighted Average Assumptions [Line Items]
Discount rate	4.90%	5.00%	5.40%
Expected return on plan assets	3.10%	3.50%	3.70%
Salary progression rate	3.40%	4.00%	4.20%