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Suspended Exploratory Well Costs - Suspended Exploratory Well Costs (Detail) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Project
Dec. 31, 2012
Project
Dec. 31, 2011
Project
Extractive Industries [Abstract]      
Balance at beginning of period $ 57,360 $ 93,388 $ 23,908
Additions to capitalized exploratory well costs pending the determination of proved reserves 39,832 153,250 86,996
Reclassifications to wells, facilities and equipment based on determination of proved reserves (84,840) (184,298) (17,516)
Divested wells   (4,980)  
Capitalized exploratory well costs charged to expense (5,388)    
Balance at end of period 6,964 57,360 93,388
Less exploratory well costs that have been capitalized for a period of one year or less   (45,965) (83,860)
Capitalized exploratory well costs that have been capitalized for a period greater than one year $ 6,964 $ 11,395 $ 9,528
Number of projects that have exploratory well costs that have been capitalized for a period greater than one year 1 5 3