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 ($)
Oct. 30, 2018
Sep. 30, 2018
Feb. 14, 2018
Dec. 31, 2017
Jan. 26, 2015
Jan. 22, 2014
Jul. 30, 2013
Debt Instrument [Line Items]              
Deferred acquisition costs   $ 5,711,000   $ 7,029,000      
2015 Secured Credit Agreement              
Debt Instrument [Line Items]              
Deferred acquisition costs   1,400,000          
Maximum borrowing capacity     $ 80,000,000.0 $ 100,000,000.0 $ 200,000,000.0    
Minimum liquidity amount     30,000,000.0        
Minimum liquidity amount, restricted amount   15,000,000.0 15,000,000.0        
Maximum borrowing capacity net of restricted liquidity amount and outstanding letters of credit     $ 65,000,000.0        
Unamortized debt issuance expense   1,400,000          
Senior secured credit facility   79,900,000          
Letters of credit outstanding   6,300,000          
Remaining borrowing capacity   58,600,000          
Long-term line of credit   0          
2015 Secured Credit Agreement | Subsequent Event              
Debt Instrument [Line Items]              
Cash collateral to support letters of credit $ 10,000,000.0            
Revolver borrowing availability increase $ 10,000,000.0            
6.75% Senior Notes, due July 2022              
Debt Instrument [Line Items]              
Percentage of notes guaranteed by restricted subsidiaries           6.75%  
Aggregate principal amount           $ 360,000,000.0  
Debt issuance costs   7,600,000          
Deferred acquisition costs   $ 3,900,000          
Redemption price rate after year three   103.375%          
Redemption price rate after year five           101.00%  
7.50% Senior Notes, due August 2020              
Debt Instrument [Line Items]              
Percentage of notes guaranteed by restricted subsidiaries             7.50%
Aggregate principal amount             $ 225,000,000.0
Debt issuance costs   $ 5,600,000          
Deferred acquisition costs   $ 1,800,000          
Redemption price rate after year five             101.00%