|
Deferred Revenue - Additional Information (Detail) (USD $)
In Thousands, unless otherwise specified |
0 Months Ended | 12 Months Ended |
|---|---|---|
|
Sep. 22, 2013
|
Dec. 31, 2011
|
|
| Revenue Recognition [Abstract] | ||
| Received rent payment | $ 3,293 | |
| Term of oil exploration lease | 8 years | 8 years |
| Lease period where payment recognized | 12 months |