Quarterly report pursuant to Section 13 or 15(d)

Long-Term Debt - Additional Information (Detail)

v3.10.0.1
Long-Term Debt - Additional Information (Detail) - USD ($)
9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Oct. 31, 2018
Dec. 31, 2017
Sep. 29, 2017
Debt Disclosure [Line Items]          
Line of Credit Facility, Maximum Borrowing Capacity $ 340,000,000        
Debt Issuance Costs, Line of Credit Arrangements, Gross $ 700,000        
Interest Coverage Ratio, Maximum 3.00        
Current Ratio 1.00        
Second Lien Facility $ 200,000,000     $ 200,000,000 $ 200,000,000
Proceeds from Debt, Net of Issuance Costs   $ 187,800,000      
Debt Instrument, Unamortized Discount 3,334,000     3,839,000 4,000,000
Unamortized Debt Issuance Expense $ 6,822,000     7,894,000 $ 8,200,000
Debt Instrument, Discounted Percentage 98.00%        
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 $ 450,000,000        
Interest Rate at Period End 5.95%        
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 $ 400,000     $ 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 9.25% 8.34%      
Second Lien Facility, Effective Interest Rate 9.89%        
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        
Subsequent Event [Member]          
Debt Disclosure [Line Items]          
Debt Issuance Costs, Line of Credit Arrangements, Gross     $ 300,000    
Subsequent Event [Member] | Revolving Credit Facility          
Debt Disclosure [Line Items]          
Line of Credit Facility, Maximum Borrowing Capacity     $ 450,000,000