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Corporate Borrowings and Capital Lease Obligations (Detail)
1 Months Ended 12 Months Ended
Jun. 28, 2011
USD ($)
Dec. 28, 2006
USD ($)
Dec. 31, 2007
USD ($)
Dec. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
Dec. 31, 2013
USD ($)
Debt Instrument [Line Items]            
Unamortized loan fees       $ (636,000) $ (384,000)  
Sale leaseback transaction, gross proceeds $ 7,335,000          
Sale leaseback transaction, monthly rental payments $ 110,000          
Sale leaseback transaction, lease terms 60 months          
Sale leaseback transaction, imputed interest rate 2.61% 4.90% 4.90%      
Leveraged leases, net investment in leveraged leases disclosure, residual value of leased assets $ 1,328,000          
Operating leases, contract terms, acceleration in the event of default, duration of default       10 days    
Sale leaseback transaction, gross proceeds   $ 7,000,000        
Sale leaseback transaction, other payments required     $ 50,000      
Sale leaseback admin fee payment period     10 years      
Special assessment bond   $ 7,000,000        
Operating leases, rent expense       $ 2,283,000 $ 2,241,000 $ 2,844,000
Second Amended and Restated Credit Agreement [Member]            
Debt Instrument [Line Items]            
Maximum borrowing capacity       $ 80,000,000    
Water Cooling System Sale Leaseback [Member]            
Debt Instrument [Line Items]            
Sale leaseback transaction, lease terms 72 months          
Minimum [Member] | Second Amended and Restated Credit Agreement [Member] | Wells Fargo Bank [Member]            
Debt Instrument [Line Items]            
Credit facility covenant, fixed charge coverage ratio (less than)       1.1    
Credit facility covenant, excess availability from fixed charge coverage (less than)       $ 10,000,000