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Revolving Line of Credit and Term Loan - Additional Information (Detail) (USD $)
 6 Months Ended 0 Months Ended 6 Months Ended 0 Months Ended 6 Months Ended 0 Months Ended 6 Months Ended 6 Months Ended 0 Months Ended 6 Months Ended 0 Months Ended
Jun. 30, 2014
Dec. 31, 2013
Jun. 30, 2014
Term Loan B Debt [Member]
Apr. 01, 2014
Wells Fargo Bank, N.A [Member]
Apr. 01, 2014
Minimum [Member]
Wells Fargo Bank, N.A [Member]
Jun. 28, 2013
Minimum [Member]
Wells Fargo Bank, N.A [Member]
Jun. 30, 2014
Minimum [Member]
Wells Fargo Bank, N.A [Member]
Apr. 01, 2014
Maximum [Member]
Wells Fargo Bank, N.A [Member]
Jun. 28, 2013
Maximum [Member]
Wells Fargo Bank, N.A [Member]
Jun. 30, 2014
Maximum [Member]
Wells Fargo Bank, N.A [Member]
Apr. 01, 2014
Amended Wells Credit Agreement I [Member]
Jun. 30, 2014
Amended Wells Credit Agreement I [Member]
Apr. 01, 2014
Amended Wells Credit Agreement I [Member]
Term Loan B Debt [Member]
Jun. 30, 2014
Amended Wells Credit Agreement I [Member]
Minimum [Member]
Apr. 01, 2014
Amended Wells Credit Agreement I [Member]
Minimum [Member]
Wells Fargo Bank, N.A [Member]
Apr. 01, 2014
Amended Wells Credit Agreement I [Member]
Maximum [Member]
Wells Fargo Bank, N.A [Member]
Jun. 30, 2014
BMO Harris Bank N A prime rate [Member]
Mar. 20, 2012
BMO Harris Bank N A prime rate [Member]
Mar. 20, 2012
BMO Harris Bank N A prime rate [Member]
Minimum [Member]
Mar. 20, 2012
BMO Harris Bank N A prime rate [Member]
Maximum [Member]
Line of Credit Facility [Line Items]                                        
Agreement provides for borrowings under a revolving line of credit           $ 75,000,000     $ 100,000,000               $ 50,000,000      
Applicable margin, during the period         0.00% 0.00%   0.50% 0.50%                   0.00% 0.50%
Line of credit, interest at LIBOR     4.66%   1.50% 1.50%   2.00% 2.00%   4.50% 0.16%             1.75% 2.25%
Percentage of revolving unused line fee       0.25%         0.25%               0.25%      
Consecutive days of liquidity threshold                   60 days                    
Liquidity threshold                 9,375,000                 7,500,000    
Percent of total credit facility                 12.50%                 50.00%    
Line of credit facility covenants minimum fixed charge coverage ratio           1.0               1.20            
Increased line of credit             75,000,000     90,000,000         75,000,000 90,000,000        
Long term borrowings                         5,000,000              
Amortization period                       36 months                
Line of credit facility covenants maximum debt leverage ratio                       4.0                
Line of credit, LIBOR                     LIBOR plus 4.5%                  
Revolving line of credit, scheduled maturity date                                 Mar. 20, 2017      
Outstanding borrowings under its revolving line of credit 69,000,000 9,000,000 4,900,000                                  
Line of Credit bears interest at BMO Bank's LIBOR rate 1.65% 1.67%                                    
Remaining outstanding balance 1,100,000 8,900,000                                    
Percentage of applicable margin interest rate 3.25% 3.25%                                    
Unused and available line of credit balance $ 19,400,000 $ 47,900,000