Commodity Collar Contracts (Detail) (Oil and gas commodity contracts, 2014 Collar)
Dec. 31, 2013
bbl
Two Way
 
Derivative [Line Items]  
Bbl Per Day 1,500
Weighted Average Floor Price 65.00
Weighted Average Ceiling Price 110.00
Three Way
 
Derivative [Line Items]  
Bbl Per Day 2,000
Weighted Average Short Put Price 70.00
Weighted Average Floor Price 85.00
Weighted Average Ceiling Price 100.83