Annual report pursuant to Section 13 and 15(d)

Long-Term Debt - Redemption Price, Percentage (Detail)

v3.8.0.1
Long-Term Debt - Redemption Price, Percentage (Detail)
 12 Months Ended
Dec. 31, 2017
6.125% Senior Subordinated Notes due 2027 [Member]  
Debt Instrument Redemption [Line Items]  
Redemption Price 106.125%
6.125% Senior Subordinated Notes due 2027 [Member] | Beginning on March 15, 2022 [Member]  
Debt Instrument Redemption [Line Items]  
Redemption Price 103.063%
6.125% Senior Subordinated Notes due 2027 [Member] | Beginning on March 15, 2023 [Member]  
Debt Instrument Redemption [Line Items]  
Redemption Price 102.042%
6.125% Senior Subordinated Notes due 2027 [Member] | Beginning on March 15, 2024 [Member]  
Debt Instrument Redemption [Line Items]  
Redemption Price 101.021%
6.125% Senior Subordinated Notes due 2027 [Member] | Beginning on March 15, 2025 and Thereafter [Member]  
Debt Instrument Redemption [Line Items]  
Redemption Price 100.00%
5.0% Senior Subordinated Notes due 2023 [Member] | Beginning on May 15, 2018 [Member]  
Debt Instrument Redemption [Line Items]  
Redemption Price 102.50%
5.0% Senior Subordinated Notes due 2023 [Member] | Beginning on May 15, 2019 [Member]  
Debt Instrument Redemption [Line Items]  
Redemption Price 101.667%
5.0% Senior Subordinated Notes due 2023 [Member] | Beginning on May 15, 2020 [Member]  
Debt Instrument Redemption [Line Items]  
Redemption Price 100.833%
5.0% Senior Subordinated Notes due 2023 [Member] | Beginning on May 15, 2021 and Thereafter [Member]  
Debt Instrument Redemption [Line Items]  
Redemption Price 100.00%