Fair Value Measurements - Additional Information (Details) - USD ($)	3 Months Ended	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Fair value assets transfer from Level 1 to Level 2	$ 0	$ 0
Fair value assets transfer from Level 2 to Level 1	0	0
Fair value liabilities transfer from Level 1 to Level 2	0	0
Fair value liabilities transfer from Level 2 to Level 1	0	0
Impairment of goodwill		1,547,000
2014 Eagle Ford Properties [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Impairment of goodwill	$ 1,500,000	1,547,000
Proved Property [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Asset impairments		93,984,000	$ 16,903,000	$ 9,817,000
Proved Property [Member] | Fair Value on a Nonrecurring Basis [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Asset impairments		93,984,000	16,903,000	9,817,000
Unproved Property [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Asset impairments		42,555,000	2,456,000	2,481,000
Unproved Property [Member] | Fair Value on a Nonrecurring Basis [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Asset impairments		$ 42,555,000	$ 2,456,000	$ 2,481,000