Quarterly report pursuant to Section 13 or 15(d)

Long-Term Debt - Schedule of Redemption Prices expressed as Percentages of Principal Amount (Detail)

v3.10.0.1
Long-Term Debt - Schedule of Redemption Prices expressed as Percentages of Principal Amount (Detail) - Senior Notes Due 2026 [Member]
1 Months Ended 9 Months Ended
Aug. 31, 2018
Sep. 30, 2018
Debt Instrument Redemption [Line Items]    
Redemption prices, expressed as percentages of principal amount 100.00%  
2021 [Member]    
Debt Instrument Redemption [Line Items]    
Redemption prices, expressed as percentages of principal amount   103.625%
2022 [Member]    
Debt Instrument Redemption [Line Items]    
Redemption prices, expressed as percentages of principal amount   101.813%
2023 and Thereafter [Member]    
Debt Instrument Redemption [Line Items]    
Redemption prices, expressed as percentages of principal amount   100.00%