Condensed Consolidating Statements of Cash Flows (Parenthetical) (Detail) |
6 Months Ended | ||
|---|---|---|---|
Jun. 30, 2017 |
Jun. 30, 2016 |
May 09, 2016 |
|
| Senior Notes 5.875 Percent Due 2024 | |||
| Condensed Cash Flow Statements Captions [Line Items] | |||
| Debt instrument interest rate | 5.875% | 5.875% | |
| Debt instrument due year | 2024 | 2024 | |
| Senior Notes 7.875 Percent Due 2020 | |||
| Condensed Cash Flow Statements Captions [Line Items] | |||
| Debt instrument interest rate | 7.875% | 7.875% | 7.875% |
| Debt instrument due year | 2020 | 2020 | |