|
Capitalization of Exploratory Well Costs - Schedule of Capitalized Exploratory Well Costs (Detail) (USD $)
In Millions, unless otherwise specified |
Dec. 31, 2013
Well
|
Dec. 31, 2012
Well
|
Dec. 31, 2011
Well
|
|---|---|---|---|
| Projects With Exploratory Well Costs Capitalized For More Than One Year [Line Items] | |||
| Capitalized exploratory well costs that have been capitalized for a period less than one year | $ 5.9 | $ 8.0 | |
| Capitalized exploratory well costs that have been capitalized for a period greater than one year | 16.7 | 8.1 | |
| Total | $ 16.7 | $ 14.0 | $ 8.0 |
| Number of exploratory wells that have been capitalized for a period greater than one year | 2 | 1 | 1 |
| X | ||||||||||
|
- Definition
The amount of capitalized exploratory well costs that is pending the determination of proved reserves. This does not include amounts that were capitalized and subsequently expensed in the same annual period. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
The amount of exploratory well costs that have been capitalized for a period of greater than one year after the completion of drilling. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
The amount of exploratory well costs that have been capitalized for a period of one year or less after the completion of drilling. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
The number of projects for which exploratory well costs have been capitalized for a period of greater than one year after the completion of drilling. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Details
|