Annual report pursuant to Section 13 and 15(d)

Supplemental Information on Oil and Gas Producing Activities - Results of Operations for Oil and Gas Producing Activities (Detail)

v2.4.0.8
Supplemental Information on Oil and Gas Producing Activities - Results of Operations for Oil and Gas Producing Activities (Detail) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
United States
      
Results of Operations for Oil and Gas Producing Activities:      
Crude oil and gas sales $ 1,891 $ 2,798 $ 1,655
Production, G&A and other expense (12,232) (47,866) (7,413)
Depreciation, depletion and amortization (1,528) (3,872) (1,922)
Income tax         
Results from oil and gas producing activities (11,869) (48,940) (7,680)
Gabon
      
Results of Operations for Oil and Gas Producing Activities:      
Crude oil and gas sales 167,386 192,489 208,781
Production, G&A and other expense (52,776) (27,425) (27,471)
Depreciation, depletion and amortization (15,302) (15,954) (23,604)
Income tax (34,115) (81,813) (93,468)
Results from oil and gas producing activities $ 65,193 $ 67,297 $ 64,238