Derivative Activities - Schedule of Additional Information Related to Master Netting Arrangements with Derivative Counterparties (Detail) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Derivative [Line Items]
Gross Amounts of Recognized Assets	$ 185,342	$ 122,624
Gross Amounts Offset in the Balance Sheet	(22,206)	(29,829)
Net Amounts of Assets Presented in the Balance Sheet	163,136	92,795
Gross Amounts of Recognized (Liabilities)	(24,981)	(37,435)
Gross Amounts Offset in the Balance Sheet	22,206	29,829
Net Amounts of (Liabilities) Presented in the Balance Sheet	(2,775)	(7,606)
Commodity \| Swaps \| Natural Gas
Derivative [Line Items]
Gross Amounts of Recognized Assets	128,392	20,834
Gross Amounts Offset in the Balance Sheet	(2,132)	(11,748)
Net Amounts of Assets Presented in the Balance Sheet	126,260	9,086
Gross Amounts of Recognized (Liabilities)	(2,132)	(18,332)
Gross Amounts Offset in the Balance Sheet	2,132	11,748
Net Amounts of (Liabilities) Presented in the Balance Sheet	0	(6,584)
Commodity \| Swaps \| Crude Oil
Derivative [Line Items]
Gross Amounts of Recognized Assets	8,459	26,481
Gross Amounts Offset in the Balance Sheet	(4,932)	(651)
Net Amounts of Assets Presented in the Balance Sheet	3,527	25,830
Gross Amounts of Recognized (Liabilities)	(4,932)	0
Gross Amounts Offset in the Balance Sheet	4,932	651
Net Amounts of (Liabilities) Presented in the Balance Sheet	0	651
Commodity \| Swaps \| NGLs (C3-Propane)
Derivative [Line Items]
Gross Amounts of Recognized Assets		18,719
Gross Amounts Offset in the Balance Sheet		(589)
Net Amounts of Assets Presented in the Balance Sheet		18,130
Gross Amounts of Recognized (Liabilities)		0
Gross Amounts Offset in the Balance Sheet		589
Net Amounts of (Liabilities) Presented in the Balance Sheet		589
Commodity \| Swaps \| NGLs (C5-Natural Gasoline)
Derivative [Line Items]
Gross Amounts of Recognized Assets	7,857	17,371
Gross Amounts Offset in the Balance Sheet	0	0
Net Amounts of Assets Presented in the Balance Sheet	7,857	17,371
Commodity \| Swaps \| Freight
Derivative [Line Items]
Gross Amounts of Recognized Assets	1,501	0
Gross Amounts Offset in the Balance Sheet	0	(561)
Net Amounts of Assets Presented in the Balance Sheet	1,501	(561)
Gross Amounts of Recognized (Liabilities)		(561)
Gross Amounts Offset in the Balance Sheet		561
Net Amounts of (Liabilities) Presented in the Balance Sheet		0
Commodity \| Swaps \| NGLs (NC4-Normal Butane)
Derivative [Line Items]
Gross Amounts of Recognized Assets		4,084
Gross Amounts Offset in the Balance Sheet		0
Net Amounts of Assets Presented in the Balance Sheet		4,084
Commodity \| Swaptions \| Natural Gas
Derivative [Line Items]
Gross Amounts of Recognized Assets	29,982	5,200
Gross Amounts Offset in the Balance Sheet	(6,070)	(3,883)
Net Amounts of Assets Presented in the Balance Sheet	23,912	1,317
Gross Amounts of Recognized (Liabilities)	(6,070)	(7,972)
Gross Amounts Offset in the Balance Sheet	6,070	3,883
Net Amounts of (Liabilities) Presented in the Balance Sheet	0	(4,089)
Commodity \| Basis Swaps \| Natural Gas
Derivative [Line Items]
Gross Amounts of Recognized Assets	1,220	6,468
Gross Amounts Offset in the Balance Sheet	(1,305)	(2,822)
Net Amounts of Assets Presented in the Balance Sheet	(85)	3,646
Gross Amounts of Recognized (Liabilities)	(3,255)	(1,702)
Gross Amounts Offset in the Balance Sheet	1,305	2,822
Net Amounts of (Liabilities) Presented in the Balance Sheet	(1,950)	1,120
Commodity \| Collars \| Crude Oil
Derivative [Line Items]
Gross Amounts of Recognized Assets	1,116	5,945
Gross Amounts Offset in the Balance Sheet	0	(707)
Net Amounts of Assets Presented in the Balance Sheet	1,116	5,238
Gross Amounts of Recognized (Liabilities)		0
Gross Amounts Offset in the Balance Sheet		707
Net Amounts of (Liabilities) Presented in the Balance Sheet		707
Commodity \| Collars \| NGLs (C3-Propane)
Derivative [Line Items]
Gross Amounts of Recognized Assets		8,538
Gross Amounts Offset in the Balance Sheet		0
Net Amounts of Assets Presented in the Balance Sheet		8,538
Commodity \| Spread Swaps \| NGLs (C3-Propane)
Derivative [Line Items]
Gross Amounts of Recognized Assets	6,815	8,984
Gross Amounts Offset in the Balance Sheet	(7,767)	(8,868)
Net Amounts of Assets Presented in the Balance Sheet	(952)	116
Gross Amounts of Recognized (Liabilities)	(8,592)	(8,868)
Gross Amounts Offset in the Balance Sheet	7,767	8,868
Net Amounts of (Liabilities) Presented in the Balance Sheet	$ (825)	$ 0

Fair value of liability associated with financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset.

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