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Plant, Equipment, and Leasehold Improvements (Detail) (USD $)
In Thousands, unless otherwise specified
9 Months Ended
Sep. 27, 2013
Dec. 28, 2012
Property, Plant and Equipment [Line Items]    
Equipment and leasehold improvements, Gross $ 33,608 $ 23,034
Less: accumulated depreciation and amortization (15,343) (13,669)
Equipment and leasehold improvements, net 18,265 9,365
Land
   
Property, Plant and Equipment [Line Items]    
Equipment and leasehold improvements, Gross 426  
Buildings
   
Property, Plant and Equipment [Line Items]    
Plant, equipment and leasehold improvements useful lives 20 years  
Equipment and leasehold improvements, Gross 1,439  
Machinery and equipment
   
Property, Plant and Equipment [Line Items]    
Equipment and leasehold improvements, Gross 6,466 6,268
Machinery and equipment | Minimum
   
Property, Plant and Equipment [Line Items]    
Plant, equipment and leasehold improvements useful lives 5 years  
Machinery and equipment | Maximum
   
Property, Plant and Equipment [Line Items]    
Plant, equipment and leasehold improvements useful lives 10 years  
Computers, data processing and other equipment
   
Property, Plant and Equipment [Line Items]    
Equipment and leasehold improvements, Gross 5,776 5,152
Computers, data processing and other equipment | Minimum
   
Property, Plant and Equipment [Line Items]    
Plant, equipment and leasehold improvements useful lives 3 years  
Computers, data processing and other equipment | Maximum
   
Property, Plant and Equipment [Line Items]    
Plant, equipment and leasehold improvements useful lives 7 years  
Leasehold improvements
   
Property, Plant and Equipment [Line Items]    
Equipment and leasehold improvements, Gross 8,958 8,518
Leasehold improvements | Minimum
   
Property, Plant and Equipment [Line Items]    
Plant, equipment and leasehold improvements useful lives 7 years  
Leasehold improvements | Maximum
   
Property, Plant and Equipment [Line Items]    
Plant, equipment and leasehold improvements useful lives 15 years  
Furniture and fixtures
   
Property, Plant and Equipment [Line Items]    
Plant, equipment and leasehold improvements useful lives 7 years  
Equipment and leasehold improvements, Gross 1,028 617
Vehicles
   
Property, Plant and Equipment [Line Items]    
Plant, equipment and leasehold improvements useful lives 5 years  
Equipment and leasehold improvements, Gross 1,002 839
Other
   
Property, Plant and Equipment [Line Items]    
Plant, equipment and leasehold improvements useful lives 7 years  
Equipment and leasehold improvements, Gross 95 85
Construction-in-progress
   
Property, Plant and Equipment [Line Items]    
Equipment and leasehold improvements, Gross $ 8,418 $ 1,555