Derivative Activities - Schedule of Additional Information Related to Master Netting Arrangements with Derivative Counterparties (Detail) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Derivative [Line Items]
Gross Amounts of Recognized Assets	$ 44,090	$ 122,624
Gross Amounts Offset in the Balance Sheet	(29,538)	(29,829)
Net Amounts of Assets Presented in the Balance Sheet	14,552	92,795
Gross Amounts of Recognized (Liabilities)	(45,466)	(37,435)
Gross Amounts Offset in the Balance Sheet	29,538	29,829
Net Amounts of (Liabilities) Presented in the Balance Sheet	(15,928)	(7,606)
Commodity \| Swaps \| Natural Gas
Derivative [Line Items]
Gross Amounts of Recognized Assets	15,883	20,834
Gross Amounts Offset in the Balance Sheet	(7,441)	(11,748)
Net Amounts of Assets Presented in the Balance Sheet	8,442	9,086
Gross Amounts of Recognized (Liabilities)	(13,030)	(18,332)
Gross Amounts Offset in the Balance Sheet	7,441	11,748
Net Amounts of (Liabilities) Presented in the Balance Sheet	(5,589)	(6,584)
Commodity \| Swaps \| Crude Oil
Derivative [Line Items]
Gross Amounts of Recognized Assets	2,871	26,481
Gross Amounts Offset in the Balance Sheet	(4,648)	(651)
Net Amounts of Assets Presented in the Balance Sheet	(1,777)	25,830
Gross Amounts of Recognized (Liabilities)	(11,197)	0
Gross Amounts Offset in the Balance Sheet	4,648	651
Net Amounts of (Liabilities) Presented in the Balance Sheet	(6,549)	651
Commodity \| Swaps \| NGLs (C2-Ethane)
Derivative [Line Items]
Gross Amounts of Recognized Assets	216
Gross Amounts Offset in the Balance Sheet	(216)
Net Amounts of Assets Presented in the Balance Sheet	0
Gross Amounts of Recognized (Liabilities)	0
Gross Amounts Offset in the Balance Sheet	216
Net Amounts of (Liabilities) Presented in the Balance Sheet	216
Commodity \| Swaps \| NGLs (C3-Propane)
Derivative [Line Items]
Gross Amounts of Recognized Assets	7,471	18,719
Gross Amounts Offset in the Balance Sheet	(3,108)	(589)
Net Amounts of Assets Presented in the Balance Sheet	4,363	18,130
Gross Amounts of Recognized (Liabilities)	0	0
Gross Amounts Offset in the Balance Sheet	3,108	589
Net Amounts of (Liabilities) Presented in the Balance Sheet	3,108	589
Commodity \| Swaps \| NGLs (C5-Natural Gasoline)
Derivative [Line Items]
Gross Amounts of Recognized Assets	4,643	17,371
Gross Amounts Offset in the Balance Sheet	(3,474)	0
Net Amounts of Assets Presented in the Balance Sheet	1,169	17,371
Gross Amounts of Recognized (Liabilities)	(37)
Gross Amounts Offset in the Balance Sheet	3,474
Net Amounts of (Liabilities) Presented in the Balance Sheet	3,437
Commodity \| Swaps \| Freight
Derivative [Line Items]
Gross Amounts of Recognized Assets	37	0
Gross Amounts Offset in the Balance Sheet	(37)	(561)
Net Amounts of Assets Presented in the Balance Sheet	0	(561)
Gross Amounts of Recognized (Liabilities)	(140)	(561)
Gross Amounts Offset in the Balance Sheet	37	561
Net Amounts of (Liabilities) Presented in the Balance Sheet	(103)	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	6,487	5,200
Gross Amounts Offset in the Balance Sheet	(4,634)	(3,883)
Net Amounts of Assets Presented in the Balance Sheet	1,853	1,317
Gross Amounts of Recognized (Liabilities)	(12,550)	(7,972)
Gross Amounts Offset in the Balance Sheet	4,634	3,883
Net Amounts of (Liabilities) Presented in the Balance Sheet	(7,916)	(4,089)
Commodity \| Basis Swaps \| Natural Gas
Derivative [Line Items]
Gross Amounts of Recognized Assets	838	6,468
Gross Amounts Offset in the Balance Sheet	(838)	(2,822)
Net Amounts of Assets Presented in the Balance Sheet	0	3,646
Gross Amounts of Recognized (Liabilities)	(4,278)	(1,702)
Gross Amounts Offset in the Balance Sheet	838	2,822
Net Amounts of (Liabilities) Presented in the Balance Sheet	(3,440)	1,120
Commodity \| Collars \| Crude Oil
Derivative [Line Items]
Gross Amounts of Recognized Assets	1,252	5,945
Gross Amounts Offset in the Balance Sheet	(750)	(707)
Net Amounts of Assets Presented in the Balance Sheet	502	5,238
Gross Amounts of Recognized (Liabilities)	0	0
Gross Amounts Offset in the Balance Sheet	750	707
Net Amounts of (Liabilities) Presented in the Balance Sheet	750	707
Commodity \| Collars \| NGLs (C3-Propane)
Derivative [Line Items]
Gross Amounts of Recognized Assets	967	8,538
Gross Amounts Offset in the Balance Sheet	(967)	0
Net Amounts of Assets Presented in the Balance Sheet	0	8,538
Gross Amounts of Recognized (Liabilities)	0
Gross Amounts Offset in the Balance Sheet	967
Net Amounts of (Liabilities) Presented in the Balance Sheet	967
Commodity \| Spread Swaps \| NGLs (C3-Propane)
Derivative [Line Items]
Gross Amounts of Recognized Assets	3,425	8,984
Gross Amounts Offset in the Balance Sheet	(3,425)	(8,868)
Net Amounts of Assets Presented in the Balance Sheet	0	116
Gross Amounts of Recognized (Liabilities)	(4,234)	(8,868)
Gross Amounts Offset in the Balance Sheet	3,425	8,868
Net Amounts of (Liabilities) Presented in the Balance Sheet	$ (809)	$ 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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