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Long Term Debt - Additional Information (Detail)
3 Months Ended 4 Months Ended 8 Months Ended 12 Months Ended
Sep. 30, 2015
USD ($)
Dec. 31, 2015
USD ($)
Installment
Aug. 28, 2015
USD ($)
Dec. 31, 2015
USD ($)
Installment
Dec. 31, 2014
USD ($)
Debt Instrument [Line Items]          
Total leverage ratio   0.9   0.9  
Fixed charge coverage ratio   3.7   3.7  
Credit facility, maximum borrowing capacity     $ 300,000,000    
Deferred debt issuance cost $ 2,400,000        
Long-term debt including current portion   $ 100,000,000   $ 100,000,000 $ 116,400,000
Write Off Of Deferred Debt Issuance Cost 2,500,000        
First Eight Quarterly Payments [Member]          
Debt Instrument [Line Items]          
Debt instrument, number of quarterly installments | Installment   8   8  
Debt Instrument Periodic Payment Principal       $ 1,250,000  
Second Eight Quarterly Payments [Member]          
Debt Instrument [Line Items]          
Debt instrument, number of quarterly installments | Installment   8   8  
Debt Instrument Periodic Payment Principal       $ 2,500,000  
Final Two Quarterly Payments [Member]          
Debt Instrument [Line Items]          
Debt instrument, number of quarterly installments | Installment   2   2  
Debt Instrument Periodic Payment Principal       $ 3,100,000  
Term Loan [Member]          
Debt Instrument [Line Items]          
Principal amount   $ 60,000,000 27,000,000 $ 60,000,000  
Maturity date       Oct. 26, 2017  
Debt Instrument Periodic Payment Principal       $ 3,000,000  
Long-term debt including current portion   0   0 33,000,000
Revolving Credit Facilities [Member]          
Debt Instrument [Line Items]          
Principal amount   120,000,000   $ 120,000,000  
Maturity date       Oct. 26, 2017  
Long-term debt including current portion   0   $ 0 15,000,000
Swing Line Loan [Member]          
Debt Instrument [Line Items]          
Amount of Revolving Credit Facility     25,000,000    
Letter Of Credit          
Debt Instrument [Line Items]          
Amount of Revolving Credit Facility     50,000,000    
Second Lien Credit Agreement Term Loan [Member]          
Debt Instrument [Line Items]          
Principal amount   70,000,000 70,000,000 $ 70,000,000  
Maturity date       Jul. 28, 2020  
Long-term debt including current portion   $ 0   $ 0 70,000,000
Call Premium Payment     700,000    
Credit Agreement [Member]          
Debt Instrument [Line Items]          
Deferred debt issuance cost $ 2,400,000        
Credit facility, additional interest rate over Federal Funds rate       0.50%  
Credit Facility, additional interest rate over Eurodollar Rate       1.00%  
Credit Facility, applicable margin on Base Rate Advances       1.00%  
Credit Facility, applicable margin on Eurodollar Rate Advances       2.00%  
Percentage of consolidated revenue and adjusted EBITDA that guarantor wholly-owned subsidiaries represent       95.00%  
Percentage of adjusted EBITDA that guarantor subsidiaries represent       70.00%  
Credit Agreement [Member] | One Month [Member]          
Debt Instrument [Line Items]          
Eurodollar deposits interest period       1 month  
Credit Agreement [Member] | Two Month [Member]          
Debt Instrument [Line Items]          
Eurodollar deposits interest period       2 months  
Credit Agreement [Member] | Three Month [Member]          
Debt Instrument [Line Items]          
Eurodollar deposits interest period       3 months  
Credit Agreement [Member] | Six Month [Member]          
Debt Instrument [Line Items]          
Eurodollar deposits interest period       6 months  
One Hundred Million Term Loan [Member]          
Debt Instrument [Line Items]          
Weighted-average interest rate for five year Term Loan   2.70%      
Principal amount   $ 100,000,000   $ 100,000,000  
Credit facility, maximum borrowing capacity     100,000,000    
Maturity date       Aug. 28, 2020  
Debt instrument, number of quarterly installments | Installment   18   18  
Long-term debt including current portion   $ 100,000,000   $ 100,000,000 $ 0
Two Hundred Million Revolving Credit Facility [Member]          
Debt Instrument [Line Items]          
Availability under the revolving credit facility   179,000,000   179,000,000  
Outstanding letters of credit   $ 21,000,000   $ 21,000,000  
Amount of Revolving Credit Facility     200,000,000    
Credit facility, maximum additional borrowing capacity     $ 150,000,000