Annual report pursuant to Section 13 and 15(d)

Long-Term Debt - Components of Long-Term Debt 2 (Detail)

v3.8.0.1
Long-Term Debt - Components of Long-Term Debt 2 (Detail)
 12 Months Ended
Sep. 30, 2017
Dec. 31, 2015
Nov. 09, 2015
Senior notes | Senior notes, interest at 6.125%, payable semi-annually, principal due November 2023      
Components of long-term debt      
Debt instrument interest rate stated, percentage 6.125%   6.125%
Senior notes | Senior subordinated notes, interest at 8.25%, payable semi-annually, repaid in December 2015      
Components of long-term debt      
Debt instrument interest rate stated, percentage 8.25% 8.25%  
Asset-based revolving credit facility | Asset-based revolving credit facility, interest at LIBOR plus a margin of 1.25% to 1.75% or Base Rate plus a margin of 0.25% to 0.75%, amended in April 2016 | LIBOR | Minimum      
Components of long-term debt      
Applicable interest margin rate on the credit facility 1.25%    
Asset-based revolving credit facility | Asset-based revolving credit facility, interest at LIBOR plus a margin of 1.25% to 1.75% or Base Rate plus a margin of 0.25% to 0.75%, amended in April 2016 | LIBOR | Maximum      
Components of long-term debt      
Applicable interest margin rate on the credit facility 1.75%    
Asset-based revolving credit facility | Asset-based revolving credit facility, interest at LIBOR plus a margin of 1.25% to 1.75% or Base Rate plus a margin of 0.25% to 0.75%, amended in April 2016 | Base Rate | Minimum      
Components of long-term debt      
Applicable interest margin rate on the credit facility 0.25%    
Asset-based revolving credit facility | Asset-based revolving credit facility, interest at LIBOR plus a margin of 1.25% to 1.75% or Base Rate plus a margin of 0.25% to 0.75%, amended in April 2016 | Base Rate | Maximum      
Components of long-term debt      
Applicable interest margin rate on the credit facility 0.75%    
Asset-based revolving credit facility | Asset-based revolving credit facility, interest at LIBOR plus a margin of 1.25% to 1.50% or Base Rate plus a margin of 0.25% to 0.50%, final maturity April 2021 | LIBOR | Minimum      
Components of long-term debt      
Applicable interest margin rate on the credit facility 1.25%    
Asset-based revolving credit facility | Asset-based revolving credit facility, interest at LIBOR plus a margin of 1.25% to 1.50% or Base Rate plus a margin of 0.25% to 0.50%, final maturity April 2021 | LIBOR | Maximum      
Components of long-term debt      
Applicable interest margin rate on the credit facility 1.50%    
Asset-based revolving credit facility | Asset-based revolving credit facility, interest at LIBOR plus a margin of 1.25% to 1.50% or Base Rate plus a margin of 0.25% to 0.50%, final maturity April 2021 | Base Rate | Minimum      
Components of long-term debt      
Applicable interest margin rate on the credit facility 0.25%    
Asset-based revolving credit facility | Asset-based revolving credit facility, interest at LIBOR plus a margin of 1.25% to 1.50% or Base Rate plus a margin of 0.25% to 0.50%, final maturity April 2021 | Base Rate | Maximum      
Components of long-term debt      
Applicable interest margin rate on the credit facility 0.50%