Annual report pursuant to Section 13 and 15(d)

Long-Term Debt - Long-Term Debt (Parenthetical) (Detail)

v3.19.1
Long-Term Debt - Long-Term Debt (Parenthetical) (Detail)
Dec. 31, 2018
May 19, 2017
Debt Instrument [Line Items]    
Debt instrument, interest rate, stated percentage 4.58%  
Senior Secured Debt [Member]    
Debt Instrument [Line Items]    
Debt instrument, interest rate, stated percentage 6.75% 6.75%
Senior Secured Debt [Member] | Debt Issuance Costs [Member]    
Debt Instrument [Line Items]    
Debt instrument, interest rate, stated percentage 7.08%