Derivative Activities - Schedule of Additional Information Related to Master Netting Arrangements with Derivative Counterparties (Detail) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Derivative [Line Items]
Gross Amounts of Recognized Assets	$ 135,357	$ 77,079
Gross Amounts Offset in the Balance Sheet	(37,928)	(63,596)
Net Amounts of Assets Presented in the Balance Sheet	97,429	13,483
Gross Amounts of Recognized (Liabilities)	(43,369)	(253,096)
Gross Amounts Offset in the Balance Sheet	37,928	63,596
Net Amounts of (Liabilities) Presented in the Balance Sheet	(5,441)	(189,500)
Commodity \| Swaps \| Natural Gas
Derivative [Line Items]
Gross Amounts of Recognized Assets	48,423	13,213
Gross Amounts Offset in the Balance Sheet	(17,824)	(11,425)
Net Amounts of Assets Presented in the Balance Sheet	30,599	1,788
Gross Amounts of Recognized (Liabilities)	(15,527)	(158,359)
Gross Amounts Offset in the Balance Sheet	17,824	11,425
Net Amounts of (Liabilities) Presented in the Balance Sheet	2,297	(146,934)
Commodity \| Swaps \| Crude Oil
Derivative [Line Items]
Gross Amounts of Recognized Assets	25,230	9,356
Gross Amounts Offset in the Balance Sheet	(798)	(3,489)
Net Amounts of Assets Presented in the Balance Sheet	24,432	5,867
Gross Amounts of Recognized (Liabilities)	(137)	(13,206)
Gross Amounts Offset in the Balance Sheet	798	3,489
Net Amounts of (Liabilities) Presented in the Balance Sheet	661	(9,717)
Commodity \| Swaps \| NGLs (C2-Ethane)
Derivative [Line Items]
Gross Amounts of Recognized Assets	482	53
Gross Amounts Offset in the Balance Sheet	(36)	(53)
Net Amounts of Assets Presented in the Balance Sheet	446	0
Gross Amounts of Recognized (Liabilities)	(36)	(1,008)
Gross Amounts Offset in the Balance Sheet	36	53
Net Amounts of (Liabilities) Presented in the Balance Sheet	0	(955)
Commodity \| Swaps \| NGLs (C3-Propane)
Derivative [Line Items]
Gross Amounts of Recognized Assets	7,025
Gross Amounts Offset in the Balance Sheet	(6,803)
Net Amounts of Assets Presented in the Balance Sheet	222
Gross Amounts of Recognized (Liabilities)	(6,708)	(32,437)
Gross Amounts Offset in the Balance Sheet	6,803	0
Net Amounts of (Liabilities) Presented in the Balance Sheet	95	(32,437)
Commodity \| Swaps \| NGLs (NC4-Normal Butane)
Derivative [Line Items]
Gross Amounts of Recognized Assets	9,957	4
Gross Amounts Offset in the Balance Sheet	(1,561)	(4)
Net Amounts of Assets Presented in the Balance Sheet	8,396	0
Gross Amounts of Recognized (Liabilities)	(1,561)	(13,419)
Gross Amounts Offset in the Balance Sheet	1,561	4
Net Amounts of (Liabilities) Presented in the Balance Sheet	0	(13,415)
Commodity \| Swaps \| NGLs (C5-Natural Gasoline)
Derivative [Line Items]
Gross Amounts of Recognized Assets	5,760
Gross Amounts Offset in the Balance Sheet	(910)
Net Amounts of Assets Presented in the Balance Sheet	4,850
Gross Amounts of Recognized (Liabilities)	(910)	(12,176)
Gross Amounts Offset in the Balance Sheet	910	0
Net Amounts of (Liabilities) Presented in the Balance Sheet	0	(12,176)
Commodity \| Swaps \| Freight
Derivative [Line Items]
Gross Amounts of Recognized Assets	109	65
Gross Amounts Offset in the Balance Sheet	0	(65)
Net Amounts of Assets Presented in the Balance Sheet	109	0
Gross Amounts of Recognized (Liabilities)		0
Gross Amounts Offset in the Balance Sheet		65
Net Amounts of (Liabilities) Presented in the Balance Sheet		65
Commodity \| Basis Swaps \| Natural Gas
Derivative [Line Items]
Gross Amounts of Recognized Assets	1,412	12,535
Gross Amounts Offset in the Balance Sheet	(2,632)	(9,437)
Net Amounts of Assets Presented in the Balance Sheet	(1,220)	3,098
Gross Amounts of Recognized (Liabilities)	(11,930)	(687)
Gross Amounts Offset in the Balance Sheet	2,632	9,437
Net Amounts of (Liabilities) Presented in the Balance Sheet	(9,298)	8,750
Commodity \| Collars \| Natural Gas
Derivative [Line Items]
Gross Amounts of Recognized Assets	10,629	6,298
Gross Amounts Offset in the Balance Sheet	(804)	(6,298)
Net Amounts of Assets Presented in the Balance Sheet	9,825	0
Gross Amounts of Recognized (Liabilities)	0	(2,625)
Gross Amounts Offset in the Balance Sheet	804	6,298
Net Amounts of (Liabilities) Presented in the Balance Sheet	804	3,673
Commodity \| Puts \| Natural Gas
Derivative [Line Items]
Gross Amounts of Recognized Assets	17,314	18,159
Gross Amounts Offset in the Balance Sheet	0	(15,429)
Net Amounts of Assets Presented in the Balance Sheet	17,314	2,730
Gross Amounts of Recognized (Liabilities)		0
Gross Amounts Offset in the Balance Sheet		15,429
Net Amounts of (Liabilities) Presented in the Balance Sheet		15,429
Commodity \| Calls \| Natural Gas
Derivative [Line Items]
Gross Amounts of Recognized Assets	0
Gross Amounts Offset in the Balance Sheet	(134)
Net Amounts of Assets Presented in the Balance Sheet	(134)
Gross Amounts of Recognized (Liabilities)	(134)	(1,041)
Gross Amounts Offset in the Balance Sheet	134	0
Net Amounts of (Liabilities) Presented in the Balance Sheet	0	(1,041)
Commodity \| Spread Swaps \| NGLs (C3-Propane)
Derivative [Line Items]
Gross Amounts of Recognized Assets	9,016	17,396
Gross Amounts Offset in the Balance Sheet	(6,426)	(17,396)
Net Amounts of Assets Presented in the Balance Sheet	2,590	0
Gross Amounts of Recognized (Liabilities)	(6,426)	(18,138)
Gross Amounts Offset in the Balance Sheet	6,426	17,396
Net Amounts of (Liabilities) Presented in the Balance Sheet	$ 0	$ (742)

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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