Property and Equipment - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended	12 Months Ended
	Sep. 30, 2016	Sep. 30, 2016	Dec. 31, 2015
Property Plant And Equipment [Line Items]
Proved development wells excluded from depletion	$ 100	$ 100	$ 700
Acquisition costs of proved properties		17,700	20,000
Well costs and additional development costs	91,200	91,200	111,400
Exploratory dry hole costs	1,500	3,000
Inventory	4,926	4,926
Inventory [Member]
Property Plant And Equipment [Line Items]
Property plant and equipment excluded from depreciation	20,000	20,000	$ 21,300
Guney Residere Well [Member]
Property Plant And Equipment [Line Items]
Exploratory dry hole costs	700	700
Hayrabolu-10 well [Member] | Turkey [Member]
Property Plant And Equipment [Line Items]
Exploratory drilling costs capitalized	1,200	1,200
Pinar - 1 well [Member] | Turkey [Member]
Property Plant And Equipment [Line Items]
Exploratory drilling costs capitalized	$ 2,100	$ 2,100