Estimated Useful Lives of Property and Equipment (Detail)	12 Months Ended
	Dec. 31, 2012
Leasehold Improvements [Member]
Property, Plant and Equipment [Line Items]
Property plant and equipment, estimated useful life	Shorter of estimated life or term of lease
Capital Lease [Member]
Property, Plant and Equipment [Line Items]
Property plant and equipment, estimated useful life	Shorter of useful life or term of lease
Minimum [Member] | Plant And Equipment [Member]
Property, Plant and Equipment [Line Items]
Property plant and equipment, estimated useful life	2 years
Minimum [Member] | Computer Equipment And Software [Member]
Property, Plant and Equipment [Line Items]
Property plant and equipment, estimated useful life	1 year
Minimum [Member] | Production Tooling [Member]
Property, Plant and Equipment [Line Items]
Property plant and equipment, estimated useful life	2 years
Minimum [Member] | Building [Member]
Property, Plant and Equipment [Line Items]
Property plant and equipment, estimated useful life	5 years
Minimum [Member] | Furniture and Fixtures [Member]
Property, Plant and Equipment [Line Items]
Property plant and equipment, estimated useful life	1 year
Maximum [Member] | Plant And Equipment [Member]
Property, Plant and Equipment [Line Items]
Property plant and equipment, estimated useful life	20 years
Maximum [Member] | Computer Equipment And Software [Member]
Property, Plant and Equipment [Line Items]
Property plant and equipment, estimated useful life	10 years
Maximum [Member] | Production Tooling [Member]
Property, Plant and Equipment [Line Items]
Property plant and equipment, estimated useful life	5 years
Maximum [Member] | Building [Member]
Property, Plant and Equipment [Line Items]
Property plant and equipment, estimated useful life	50 years
Maximum [Member] | Furniture and Fixtures [Member]
Property, Plant and Equipment [Line Items]
Property plant and equipment, estimated useful life	15 years