v3.6.0.2
Debt - Summary of Outstanding Long-Term Debt (Parenthetical) (Detail)
Dec. 31, 2016
Fixed-Rate 3.5% Senior Unsecured Notes Maturing in September 2016 [Member]  
Debt Instrument [Line Items]  
Fixed rate on notes 3.50%
Fixed-Rate 3.75% Senior Unsecured Notes Maturing in June 2018 [Member]  
Debt Instrument [Line Items]  
Fixed rate on notes 3.75%
Fixed-Rate 4.125% Senior Unsecured Notes Maturing in June 2020 [Member]  
Debt Instrument [Line Items]  
Fixed rate on notes 4.125%
Fixed-Rate 4.125% Senior Unsecured Notes Maturing in June 2021 [Member]  
Debt Instrument [Line Items]  
Fixed rate on notes 4.125%
Fixed-Rate 5.75% Senior Unsecured Notes Maturing in February 2021 [Member]  
Debt Instrument [Line Items]  
Fixed rate on notes 5.75%
Fixed-Rate 5% Senior Secured Notes Maturing in May 2021 [Member]  
Debt Instrument [Line Items]  
Fixed rate on notes 5.00%
Fixed-Rate 3.875% Senior Unsecured Notes Maturing in September 2022 [Member]  
Debt Instrument [Line Items]  
Fixed rate on notes 3.875%
Fixed-Rate 6% Senior Secured Notes Maturing in January 2022 [Member]  
Debt Instrument [Line Items]  
Fixed rate on notes 6.00%
Fixed-Rate 4.625% Senior Unsecured Notes Maturing in June 2022 [Member]  
Debt Instrument [Line Items]  
Fixed rate on notes 4.625%
Fixed-Rate 5.75% Senior Unsecured Notes Maturing in March 2023 [Member]  
Debt Instrument [Line Items]  
Fixed rate on notes 5.75%
Fixed-Rate 4.625% Senior Unsecured Notes Maturing in June 2023 [Member]  
Debt Instrument [Line Items]  
Fixed rate on notes 4.625%
Fixed-Rate 1% Cash Convertible Notes Maturing in December 2019 [Member]  
Debt Instrument [Line Items]  
Fixed rate on notes 1.00%