|
Components of Debt Obligations (Parenthetical) (Detail)
|
3 Months Ended | 12 Months Ended |
|---|---|---|
|
Mar. 31, 2015
|
Dec. 31, 2014
|
|
| 6 3/4 % Senior Notes Due 2020 | ||
| Debt Instrument [Line Items] | ||
| Interest percentage | 6.75% | 6.75% |
| Debt maturity period | 2020 | 2020 |
| 6.0% Senior Notes Due 2022 | ||
| Debt Instrument [Line Items] | ||
| Interest percentage | 6.00% | 6.00% |
| Debt maturity period | 2022 | 2022 |