Oil and Natural Gas Properties - Additional Information (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Oil And Natural Gas Properties [Line Items]
Accumulated impairments to proved and unproved oil and natural gas properties	$ 162.7	$ 155.9
Proved Oil and Gas Properties [Member]
Oil And Natural Gas Properties [Line Items]
Depletion expenses	$ 25.4	$ 30.7	$ 18.1
Unproved Oil and Gas Properties [Member] | Minimum [Member]
Oil And Natural Gas Properties [Line Items]
Unproved oil and gas lease term	3 years
Unproved Oil and Gas Properties [Member] | Maximum [Member]
Oil And Natural Gas Properties [Line Items]
Unproved oil and gas lease term	5 years