|
Gain on Sale of Rights Gain on Sale of Rights (Detail) (USD $)
In Thousands, unless otherwise specified |
3 Months Ended | 9 Months Ended | ||
|---|---|---|---|---|
|
Sep. 30, 2012
|
Sep. 30, 2011
|
Sep. 30, 2012
|
Sep. 30, 2011
|
|
| Gain on Sale of Rights [Abstract] | ||||
| Gain on sale of rights | $ 31,719 | $ 0 | $ 31,719 | $ 0 |