Quarterly report pursuant to Section 13 or 15(d)

Lines of Credit and Other Borrowings - Additional Information (Detail)

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Lines of Credit and Other Borrowings - Additional Information (Detail) (USD $)
 0 Months Ended 3 Months Ended 9 Months Ended
Jul. 28, 2014
Jun. 03, 2014
May 31, 2014
May 05, 2014
Apr. 10, 2014
Mar. 04, 2014
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Agreement
Sep. 30, 2013
Dec. 31, 2013
Line Of Credit Facility [Line Items]                      
Payments under lines of credit                 $ 21,508,000 $ 23,403,000  
Amortization of discount on lines of credit                 200,000 79,000  
Amortization of debt issuance costs                 128,000 152,000  
Financed insurance premium             0   0    
Number of monthly insurance premium installments payable                 Nine    
Financial insurance premiums interest rate             2.85%   2.85%    
Interest expense incurred for financed insurance premiums             0 1,000 2,000 5,000  
Comerica Bank Credit Agreements
                      
Line Of Credit Facility [Line Items]                      
Number revolving credit facility agreements                 2    
Credit agreements amendment fee         10,000 10,000          
Lines of credit maximum borrowing capacity         4,000,000 5,000,000          
Payments under lines of credit 2,900,000                    
Line of credit facility, expiration date   Aug. 01, 2014 Aug. 01, 2014 Jun. 01, 2014 May 01, 2014            
Revolving lines of credit fee paid   15,000 10,000 10,000              
Increase decrease in interest rate of lines of credit facility   0.50%                  
Unused capacity commitment fee percentage                 0.25%    
Interest expense incurred for lines of credit and loan and security agreement             37,000 181,000 451,000 381,000  
Accrued interest payable             0   0   20,000
Amortization of discount on lines of credit             0 43,000 200,000 79,000  
Amortization of debt issuance costs             0 71,000 128,000 152,000  
Restricted cash amounts             0   0   0
Aggregate agreements amendment fee.             $ 10,000 $ 10,000 $ 55,000 $ 44,000  
Comerica Bank Credit Agreements | Prime Rate
                      
Line Of Credit Facility [Line Items]                      
Prime floor, daily prime plus LIBOR               2.50%   2.50%  
Comerica Bank Credit Agreements | Domestic Revolver Credit Facility | Prime Rate
                      
Line Of Credit Facility [Line Items]                      
Interest on principal balance rate plus   2.50%                  
Comerica Bank Credit Agreements | Ex-Im Revolver | London Interbank Offered Rate (LIBOR) | Minimum | Prime Rate
                      
Line Of Credit Facility [Line Items]                      
Interest on principal balance rate plus   2.00%