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Debt - Additional Information (Detail) (USD $)
 3 Months Ended 9 Months Ended 1 Months Ended 9 Months Ended 1 Months Ended 1 Months Ended 1 Months Ended 12 Months Ended 1 Months Ended
Sep. 30, 2012
Sep. 30, 2012
Jul. 27, 2012
Revolving Credit Facility
Sep. 30, 2012
Revolving Credit Facility
Sep. 30, 2012
Revolving Credit Facility
Minimum
Sep. 30, 2012
Revolving Credit Facility
Maximum
Jul. 27, 2012
Revolving Credit Facility
Alternate Base Rate
Jul. 27, 2012
Revolving Credit Facility
Alternate Base Rate
Minimum
Jul. 27, 2012
Revolving Credit Facility
Alternate Base Rate
Maximum
Jul. 27, 2012
Revolving Credit Facility
Euro Dollar Rate
Minimum
Jul. 27, 2012
Revolving Credit Facility
Euro Dollar Rate
Maximum
Jul. 27, 2012
Senior Secured Term Loans
Sep. 30, 2012
Senior Secured Term Loans
Jul. 27, 2012
Senior Secured Term Loans
Alternate Base Rate
Jul. 27, 2012
Senior Secured Term Loans
Adjusted LIBOR Rate
Jul. 27, 2012
Senior Secured Term Loans
Covenant Requirement
Jul. 27, 2012
Senior Secured Term Loans
Covenant Requirement
if at any time EBITDA (as defined) is less than $34.0 million but equal to or greater than $30.0 million
Jul. 27, 2012
Senior Secured Term Loans
Covenant Requirement
Minimum
Jul. 27, 2012
Senior Secured Term Loans
Covenant Requirement
Maximum
Dec. 31, 2012
Senior Secured Term Loans
Subsequent Event
Covenant Requirement
Maximum
Jul. 31, 2012
Term Loan
Jun. 30, 2012
Term Loan
Debt Instrument [Line Items]                                            
Old revolving credit facility commitment     $ 150,000,000                                      
New revolving credit facility commitment     175,000,000                                      
Revolving credit facility, extended maturity date     Jul. 27, 2017                                      
Revolving credit facility, maximum commitment under expansion option     225,000,000                                      
Line of credit facility interest rate description     Borrowings under the Revolving Credit Facility bear interest, at the Company's option, at one of the following rates (i) the Alternate Base Rate, defined as the greater of the Prime Rate, Federal Funds Rate plus 0.5% or the Adjusted LIBOR rate plus 1.0%, plus a margin of 1.0% to 1.75%, or (ii) the Eurodollar Rate, defined as the Adjusted LIBOR Rate plus a margin of 2.0% to 2.75%. The respective margins are based upon availability.                                      
Interest Rate Above Federal Funds Rate             0.50%                              
Interest Rate above Libor Rate             1.00%                              
Interest rate margin               1.00% 1.75% 2.00% 2.75%     4.00% 5.00%              
Interest rates on outstanding borrowings         2.50% 4.50%                                
Percentage of Line of Credit Facility Unused Capacity Commitment Fee         0.375% 0.50%                                
Open letters or credit       1,200,000                                    
Outstanding borrowing under revolving credit facility       73,700,000                                    
Availability under revolving credit facility       90,100,000                                    
Availability under revolving credit facility, percentage of the total loan commitment       51.50%                                    
Senior secured term loan 31,500,000 31,500,000                   35,000,000                    
Maturity date                       Jul. 27, 2018                    
Interest rate on outstanding                         5.25%                  
Earnings before interest taxes depreciation and amortization required under term loan agreement                                   30,000,000 34,000,000      
Maximum Indebtedness to EBITDA ratio                                 3.0          
Maximum capital expenditures                                       7,500,000    
Fixed charge coverage ratio, minimum                               1.10            
Credit facility terms                               The Senior Secured Term Loan provides for other customary restrictions and events of default. Restrictions include limitations on additional indebtedness, acquisitions, investments and payment of dividends, among others. Further, the Senior Secured Term Loan provides that the Company maintain a minimum fixed charge coverage ratio of 1.10 to 1.00 for any four consecutive fiscal quarters ending after July 27, 2012.            
Repayment of term loan   40,000,000                                     30,000,000 10,000,000
Loss on early retirement of debt $ (1,015,000) $ (1,363,000)                                     $ (1,363,000)