Significant Accounting Policies (Useful Lives Of Each Class Of Assets) (Detail)	12 Months Ended
	Dec. 31, 2012
Minimum [Member] | Buildings And Site Improvements [Member]
Property, Plant and Equipment [Line Items]
Property and equipment useful life	2 years
Minimum [Member] | Leasehold Improvements [Member]
Property, Plant and Equipment [Line Items]
Property and equipment useful life	2 years
Minimum [Member] | Furniture And Fixtures [Member]
Property, Plant and Equipment [Line Items]
Property and equipment useful life	5 years
Minimum [Member] | Computer Equipment And Software [Member]
Property, Plant and Equipment [Line Items]
Property and equipment useful life	3 years
Maximum [Member] | Buildings And Site Improvements [Member]
Property, Plant and Equipment [Line Items]
Property and equipment useful life	31 years
Maximum [Member] | Leasehold Improvements [Member]
Property, Plant and Equipment [Line Items]
Property and equipment useful life	11 years
Maximum [Member] | Furniture And Fixtures [Member]
Property, Plant and Equipment [Line Items]
Property and equipment useful life	10 years
Maximum [Member] | Computer Equipment And Software [Member]
Property, Plant and Equipment [Line Items]
Property and equipment useful life	10 years