Income Taxes - Reconciliation of Income Tax Benefit (Provision) (Detail) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Income Tax Disclosure [Abstract]
Expected tax benefit (expense) at federal statutory rate		$ 191,870	$ 139,183	$ (39,966)
State income tax benefit (expense), net of federal benefit		382	645	(1,907)
Pass-through entities	[1]	(191,921)	(137,704)	42,000
Other		(504)	51	1,294
Total income tax benefit (expense)		$ (173)	$ 2,175	$ 1,421

[1] MEMP, a publicly traded partnership with qualifying income, is a pass-through entity for federal income tax purposes.