Unaudited Pro Forma Results as if Acquisitions of Oil and Gas Properties Had Taken Place as of Beginning of Period (Detail) (Pro Forma, USD $)	12 Months Ended
	Dec. 31, 2011
Pro Forma
Acquisitions And Dispositions Of Oil And Gas Properties [Line Items]
Total revenue	$ 2,756,294
Net income (loss)	458,553
Net income (loss) applicable to common stockholders	$ 262,553
Earnings per share:
Basic	$ 0.04
Diluted	$ 0.04