Annual report pursuant to Section 13 and 15(d)

Schedule I - Parent Company Financial Statement (Statements Of Consolidated Operations) (Detail)

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Schedule I - Parent Company Financial Statement (Statements Of Consolidated Operations) (Detail) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Revenues:                      
Oil and natural gas sales $ 17,523 [1] $ 17,546 [1] $ 27,137 [1] $ 18,239 [1] $ 23,037 [1] $ 24,486 [1] $ 52,098 [1] $ 28,071 [1] $ 80,445 $ 127,691 $ 169,277
Operating costs and expenses:                      
Depreciation, depletion and amortization                 33,010 20,086 16,929
General and administrative expense                 14,829 14,194 11,254
General and administrative related to shareholder matters                 2,372    
Total operating costs and expenses 89,301 [2] 49,667 [2] 28,225 [2] 53,857 [2] 117,308 [2] 17,799 18,270 28,721 221,050 182,097 92,052
Operating income (loss) (75,124) (32,121) (1,030) (35,278) (94,270) 6,687 33,828 (650) (143,553) (54,406) 77,225
Other income (expense):                      
Other, net                 809 (733) (111)
Total other income (expense)                 (516) (658) (38)
Income (loss) before income taxes                 (144,069) (55,064) 77,187
Income tax expense                 (14,587) (22,486) (34,115)
Net income (loss) $ (80,779) $ (33,668) $ (5,204) $ (39,005) $ (98,332) $ 3,109 $ 24,711 $ (7,038) (158,656) (77,550) 43,072
VAALCO ENERGY, INC.                      
Operating costs and expenses:                      
Depreciation, depletion and amortization                 240 94 63
General and administrative expense                 7,550 6,740 5,750
General and administrative related to shareholder matters                 2,372    
Total operating costs and expenses                 10,162 6,834 5,813
Operating income (loss)                 (10,162) (6,834) (5,813)
Other income (expense):                      
Interest income (expense), net                 (181) 33 33
Other, net                 (469) 450  
Equity in subsidiary earnings (losses)                 (146,495) (71,199) 48,852
Total other income (expense)                 (147,145) (70,716) 48,885
Income (loss) before income taxes                 (157,307) (77,550) 43,072
Income tax expense                 (1,349)    
Net income (loss)                 $ (158,656) $ (77,550) $ 43,072
[1] As discussed in Note 3 to the consolidated financial statements an error was identified the prepaid royalty account that caused previous periods to be misstated. Total revenues were corrected through an out of period adjustment in the fourth quarter of 2015 with reduction of $2.3 million, overstating operating loss and net loss by $2.3 million.
[2] Significant cost and expense items that caused total operating costs and expenses to vary among the quarters are impairments of proved properties and undeveloped leasehold costs, dry hole costs, bad debt expense and inventory write-offs.