Long-Term Debt - Schedule of Long-Term Debt (Parenthetical) (Detail)	9 Months Ended
	Sep. 30, 2018
Debt Instrument [Line Items]
Total debt average term	6 years 7 months 6 days
Total debt average rate	5.40%
Senior Secured Asset-Based Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Effective interest rate	3.70%
Senior Secured Term Loan Facilities [Member]
Debt Instrument [Line Items]
Effective interest rate	3.60%
Senior Secured Notes [Member]
Debt Instrument [Line Items]
Effective interest rate	5.60%
Other Senior Secured Debt [Member]
Debt Instrument [Line Items]
Effective interest rate	5.80%
Senior Unsecured Notes [Member]
Debt Instrument [Line Items]
Effective interest rate	6.30%