Quarterly report pursuant to Section 13 or 15(d)

Long-Term Debt - Additional Information (Detail)

v3.8.0.1
Long-Term Debt - Additional Information (Detail) - USD ($)
9 Months Ended
Sep. 30, 2017
Dec. 31, 2016
Debt Disclosure [Line Items]    
Line of Credit Facility, Maximum Borrowing Capacity $ 200,000,000  
Debt Issuance Costs, Line of Credit Arrangements, Gross 1,700,000  
Write off of Deferred Debt Issuance Cost 800,000  
Long-term Line of Credit [1] $ 57,000,000 $ 25,000,000
Debt Instrument, Discounted Percentage 98.00%  
Interest Coverage Ratio, Maximum 3.00  
Current Ratio 1.00  
Second Lien Facility $ 200,000,000 0
Proceeds from Debt, Net of Issuance Costs 188,100,000  
Debt Instrument, Unamortized Discount 4,000,000 0
Unamortized Debt Issuance Expense $ 7,945,000 0
Year 2 [Member]    
Debt Disclosure [Line Items]    
Prepayment Premium 102.00%  
Prepayment Premium, Change in Control 102.00%  
Year 3 [Member]    
Debt Disclosure [Line Items]    
Prepayment Premium 101.00%  
Prepayment Premium, Change in Control 101.00%  
Revolving Credit Facility    
Debt Disclosure [Line Items]    
Line of Credit Facility, Maximum Borrowing Capacity $ 237,500,000  
Interest Rate at Period End 4.4163%  
Revolving Credit Facility | Future Period [Member]    
Debt Disclosure [Line Items]    
Debt To E B I T D Ratio Maximum 4.00  
Revolving Credit Facility | Future Period Two [Member]    
Debt Disclosure [Line Items]    
Debt To E B I T D Ratio Maximum 3.75  
Revolving Credit Facility | Future Period Three [Member]    
Debt Disclosure [Line Items]    
Debt To E B I T D Ratio Maximum 3.50  
Letter of Credit    
Debt Disclosure [Line Items]    
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage 0.50%  
Line of Credit [Member]    
Debt Disclosure [Line Items]    
Letters of Credit Outstanding, Amount $ 800,000 $ 800,000
Line of Credit [Member] | Letter of Credit    
Debt Disclosure [Line Items]    
Line of Credit Facility, Maximum Borrowing Capacity $ 5,000,000.0  
Second Lien Facility [Member]    
Debt Disclosure [Line Items]    
Interest rate option one, applicable margin rate over Adjusted LIBOR 7.00%  
Interest rate option two, applicable margin rate 6.00%  
Second Lien Facility, Initial Interest Rate 8.34%  
Second Lien Facility, Effective Interest Rate 9.86%  
Minimum [Member] | Revolving Credit Facility    
Debt Disclosure [Line Items]    
Interest rate option one, applicable margin rate over Adjusted LIBOR 2.00%  
Interest rate option two, applicable margin rate 3.00%  
Maximum [Member] | Revolving Credit Facility    
Debt Disclosure [Line Items]    
Interest rate option one, applicable margin rate over Adjusted LIBOR 3.00%  
Interest rate option two, applicable margin rate 4.00%  
Interest Payable One [Member] | Revolving Credit Facility    
Debt Disclosure [Line Items]    
Debt Instrument, Interest Payable Period 1 month  
Interest Payable Two [Member] | Revolving Credit Facility    
Debt Disclosure [Line Items]    
Debt Instrument, Interest Payable Period 3 months  
Interest Payable Three [Member] | Revolving Credit Facility    
Debt Disclosure [Line Items]    
Debt Instrument, Interest Payable Period 6 months  
[1] 2 Issuance costs of the Credit Facility, which represent costs attributable to the access to credit over it’s contractual term, have been presented as a component of Other assets (see Note 11) and are being amortized over the term of the Credit Facility using the straight-line method.