Organization and Nature of Business - Additional Information (Detail)	9 Months Ended
	Sep. 30, 2014
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Percentage of operations concentrated in geographic areas	74.00%
Percentage of revenues concentrated in geographic areas	83.00%
Percentage of crude oil and natural gas production concentrated in crude oil	70.00%
Percentage of crude oil and natural gas revenue concentrated in crude oil	85.00%