Organization And Significant Accounting Policies (Components Of Depreciation Of Property,Plant And Equipment) (Detail)	12 Months Ended
	Dec. 31, 2011
Transportation Equipment [Member]
Property, Plant and Equipment [Line Items]
Depreciation life in years	5 years	[1]
Equipment [Member]
Property, Plant and Equipment [Line Items]
Depreciation life in years	10 years	[1]
Software [Member]
Property, Plant and Equipment [Line Items]
Depreciation life in years	5 years	[1]
Computer Equipment [Member]
Property, Plant and Equipment [Line Items]
Depreciation life in years	3 years	[1]
Other Equipment [Member] | Minimum [Member]
Property, Plant and Equipment [Line Items]
Depreciation life in years	2 years	[1]
Other Equipment [Member] | Maximum [Member]
Property, Plant and Equipment [Line Items]
Depreciation life in years	10 years	[1]
Freehold Buildings [Member]
Property, Plant and Equipment [Line Items]
Depreciation life in years	40 years	[1]

[1] Restated