Debt Facilities - Summary of Senior Notes Redemption Price Percentage (Detail) - Senior Notes [Member]	1 Months Ended	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2015
5.375% Senior Notes due 2022 [Member] | Debt Instrument Redemption Period 2018 [Member]
Debt Instrument, Redemption [Line Items]
Redemption price, percentage		104.031%
5.375% Senior Notes due 2022 [Member] | Debt Instrument Redemption Period 2019 [Member]
Debt Instrument, Redemption [Line Items]
Redemption price, percentage		102.688%
5.375% Senior Notes due 2022 [Member] | Debt Instrument Redemption Period 2020 [Member]
Debt Instrument, Redemption [Line Items]
Redemption price, percentage		101.344%
5.375% Senior Notes due 2022 [Member] | Debt Instrument Redemption Period 2021 and thereafter [Member]
Debt Instrument, Redemption [Line Items]
Redemption price, percentage		100.00%
5.750% Senior Notes due 2025 [Member] | Debt Instrument Redemption Period 2020 [Member]
Debt Instrument, Redemption [Line Items]
Redemption price, percentage		102.875%
5.750% Senior Notes due 2025 [Member] | Debt Instrument Redemption Period 2021 [Member]
Debt Instrument, Redemption [Line Items]
Redemption price, percentage		101.917%
5.750% Senior Notes due 2025 [Member] | Debt Instrument Redemption Period 2022 [Member]
Debt Instrument, Redemption [Line Items]
Redemption price, percentage		100.958%
5.750% Senior Notes due 2025 [Member] | Debt Instrument Redemption Period 2023 and thereafter [Member]
Debt Instrument, Redemption [Line Items]
Redemption price, percentage		100.00%
5.875% Senior Notes Due 2026 [Member]
Debt Instrument, Redemption [Line Items]
Redemption price, percentage	100.00%
5.875% Senior Notes Due 2026 [Member] | Debt Instrument Redemption Period 2021 [Member]
Debt Instrument, Redemption [Line Items]
Redemption price, percentage		102.938%
5.875% Senior Notes Due 2026 [Member] | Debt Instrument Redemption Period 2022 [Member]
Debt Instrument, Redemption [Line Items]
Redemption price, percentage		101.958%
5.875% Senior Notes Due 2026 [Member] | Debt Instrument Redemption Period 2023 [Member]
Debt Instrument, Redemption [Line Items]
Redemption price, percentage		100.979%
5.875% Senior Notes Due 2026 [Member] | Debt Instrument Redemption Period 2024 and thereafter [Member]
Debt Instrument, Redemption [Line Items]
Redemption price, percentage		100.00%
4.875% Senior Notes due 2020 [Member] | Debt Instrument Redemption Period 2017 [Member]
Debt Instrument, Redemption [Line Items]
Redemption price, percentage		102.438%
4.875% Senior Notes due 2020 [Member] | Debt Instrument Redemption Period 2018 [Member]
Debt Instrument, Redemption [Line Items]
Redemption price, percentage		101.219%
4.875% Senior Notes due 2020 [Member] | Debt Instrument Redemption Period 2019 and thereafter [Member]
Debt Instrument, Redemption [Line Items]
Redemption price, percentage		100.00%
5.375% Senior Notes due 2023 [Member] | Debt Instrument Redemption Period 2018 [Member]
Debt Instrument, Redemption [Line Items]
Redemption price, percentage		102.688%
5.375% Senior Notes due 2023 [Member] | Debt Instrument Redemption Period 2019 [Member]
Debt Instrument, Redemption [Line Items]
Redemption price, percentage		101.792%
5.375% Senior Notes due 2023 [Member] | Debt Instrument Redemption Period 2020 and thereafter [Member]
Debt Instrument, Redemption [Line Items]
Redemption price, percentage		100.896%
5.375% Senior Notes due 2023 [Member] | Debt Instrument Redemption Period 2021 and thereafter [Member]
Debt Instrument, Redemption [Line Items]
Redemption price, percentage		100.00%