Domestic Pension Plan's Asset Allocations by Asset Category (Detail) (Domestic Plan)	Dec. 31, 2011	Dec. 31, 2010
Defined Benefit Plan Disclosure [Line Items]
Plan asset allocations by asset category	100.00%	100.00%
Equity Securities
Defined Benefit Plan Disclosure [Line Items]
Plan asset allocations by asset category	15.00%
Fixed Income
Defined Benefit Plan Disclosure [Line Items]
Plan asset allocations by asset category	85.00%	99.00%
Other
Defined Benefit Plan Disclosure [Line Items]
Plan asset allocations by asset category		1.00%