Annual report pursuant to section 13 and 15(d)

Estimated Useful Lives of Property and Equipment (Detail)

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Estimated Useful Lives of Property and Equipment (Detail)
12 Months Ended
Dec. 31, 2012
Vehicles
 
Property, Plant and Equipment [Line Items]  
Property, plant and equipment, Useful Life 5 years
Leasehold Improvements
 
Property, Plant and Equipment [Line Items]  
Leasehold improvements Lesser of lease term or estimated useful life
Maximum | Machinery and Equipment
 
Property, Plant and Equipment [Line Items]  
Property, plant and equipment, Useful Life 20 years
Maximum | Furniture and Fixtures
 
Property, Plant and Equipment [Line Items]  
Property, plant and equipment, Useful Life 7 years
Maximum | Computers And Software
 
Property, Plant and Equipment [Line Items]  
Property, plant and equipment, Useful Life 7 years
Minimum | Machinery and Equipment
 
Property, Plant and Equipment [Line Items]  
Property, plant and equipment, Useful Life 3 years
Minimum | Furniture and Fixtures
 
Property, Plant and Equipment [Line Items]  
Property, plant and equipment, Useful Life 5 years
Minimum | Computers And Software
 
Property, Plant and Equipment [Line Items]  
Property, plant and equipment, Useful Life 3 years