Estimated Useful Lives Of Property, Plant and Equipment (Detail)	12 Months Ended
	Dec. 31, 2012
Building
Property, Plant, and Equipment Disclosure [Line Items]
Property, Plant and Equipment, Useful Life	30 years
Leasehold Improvements | Minimum
Property, Plant, and Equipment Disclosure [Line Items]
Property, Plant and Equipment, Useful Life	3 years
Leasehold Improvements | Maximum
Property, Plant, and Equipment Disclosure [Line Items]
Property, Plant and Equipment, Useful Life	5 years
Equipment and Computers | Minimum
Property, Plant, and Equipment Disclosure [Line Items]
Property, Plant and Equipment, Useful Life	3 years
Equipment and Computers | Maximum
Property, Plant, and Equipment Disclosure [Line Items]
Property, Plant and Equipment, Useful Life	5 years
Furniture and Fixtures
Property, Plant, and Equipment Disclosure [Line Items]
Property, Plant and Equipment, Useful Life	5 years