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Debt - Additional Information (Detail) - USD ($)
3 Months Ended 6 Months Ended
Mar. 26, 2015
Mar. 11, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Debt Instrument [Line Items]          
Debt amendment costs       $ 555,000  
Loss on early extinguishment of debt     $ 178,000 94,000 $ 178,000
2013 Senior Secured Credit Facility          
Debt Instrument [Line Items]          
Debt amendment costs recorded as unamortized debt discount     360,000 827,000 360,000
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     $ 178,000 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%