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Debt - Additional Information (Detail) - USD ($)
9 Months Ended
Mar. 26, 2015
Mar. 11, 2015
Sep. 30, 2015
Sep. 30, 2014
Debt Instrument [Line Items]        
Debt amendment costs     $ 555,000  
Loss on early extinguishment of debt     94,000 $ 178,000
2013 Senior Secured Credit Facility        
Debt Instrument [Line Items]        
Debt amendment costs recorded as unamortized debt discount     789,000 360,000
2013 Senior Secured Credit Facility First amendment        
Debt Instrument [Line Items]        
Debt amendment costs recorded as unamortized debt discount     555,000  
Debt amendment costs     1,086,000  
Debt Instrument, expense incurred     531,000  
Term loan facility | 2013 Senior Secured Credit Facility        
Debt Instrument [Line Items]        
Credit facility, borrowing capacity     230,000,000  
Loss on early extinguishment of debt     94,000 178,000
Excess cash flow payment $ 7,320,000     14,627,000
Mandatory principal payments     520,000  
Revolving loan facility | 2013 Senior Secured Credit Facility        
Debt Instrument [Line Items]        
Credit facility, borrowing capacity     10,000,000  
Borrowings drawn during the period     0 $ 0
Available borrowings under the facility     $ 10,000,000  
Revolving loan facility commitment fee on average daily amount of unused portion     0.50%  
LIBOR loans | 2013 Senior Secured Credit Facility | London Interbank Offered Rate (LIBOR)        
Debt Instrument [Line Items]        
Variable interest rate floor     1.00%  
LIBOR loans | 2013 Senior Secured Credit Facility | London Interbank Offered Rate (LIBOR) | Maximum        
Debt Instrument [Line Items]        
Debt Instrument, Basis Spread on Variable Rate   3.25%    
LIBOR loans | 2013 Senior Secured Credit Facility First amendment        
Debt Instrument [Line Items]        
Increase to the maximum applicable margin   0.25%    
ABR loans | 2013 Senior Secured Credit Facility | Alternative Base Rate        
Debt Instrument [Line Items]        
Variable interest rate floor     2.00%  
ABR loans | 2013 Senior Secured Credit Facility | Alternative Base Rate | Maximum        
Debt Instrument [Line Items]        
Debt Instrument, Basis Spread on Variable Rate   2.25%    
ABR loans | 2013 Senior Secured Credit Facility | Federal Funds Effective Rate        
Debt Instrument [Line Items]        
Debt Instrument, Basis Spread on Variable Rate   0.50%    
ABR loans | 2013 Senior Secured Credit Facility | Eurodollar rate        
Debt Instrument [Line Items]        
Debt Instrument, Basis Spread on Variable Rate   1.00%