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Financial Instruments - Effect of Derivative Instruments on Consolidated Balance Sheets (Detail) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Derivatives, Fair Value [Line Items]
Derivative assets	$ 1,081	$ 2,394
Derivative liabilities	(1,675)	(98)
Total derivative instruments	(594)	2,296
Derivatives Not Designated as Cash-Flow Hedging Instruments [Member] | Natural Gas Commodity Contracts [Member] | Derivative asset short-term [Member]
Derivatives, Fair Value [Line Items]
Derivative assets	136	63
Derivatives Not Designated as Cash-Flow Hedging Instruments [Member] | Natural Gas Commodity Contracts [Member] | Derivative asset long-term and other assets [Member]
Derivatives, Fair Value [Line Items]
Derivative assets		7
Derivatives Not Designated as Cash-Flow Hedging Instruments [Member] | Natural Gas Commodity Contracts [Member] | Derivative liability short-term [Member]
Derivatives, Fair Value [Line Items]
Derivative liabilities		(75)
Derivatives Not Designated as Cash-Flow Hedging Instruments [Member] | Natural Gas Commodity Contracts [Member] | Derivative liability Long Term [Member]
Derivatives, Fair Value [Line Items]
Derivative liabilities		(10)
Derivatives Not Designated as Cash-Flow Hedging Instruments [Member] | Crude Oil Commodity Contracts [Member] | Derivative asset short-term [Member]
Derivatives, Fair Value [Line Items]
Derivative assets	760	1,473
Derivatives Not Designated as Cash-Flow Hedging Instruments [Member] | Crude Oil Commodity Contracts [Member] | Derivative asset long-term and other assets [Member]
Derivatives, Fair Value [Line Items]
Derivative assets		713
Derivatives Not Designated as Cash-Flow Hedging Instruments [Member] | Crude Oil Commodity Contracts [Member] | Derivative liability short-term [Member]
Derivatives, Fair Value [Line Items]
Derivative liabilities	(1,675)
Derivatives Not Designated as Cash-Flow Hedging Instruments [Member] | Natural Gas Liquid Contracts [Member] | Derivative asset short-term [Member]
Derivatives, Fair Value [Line Items]
Derivative assets	$ 185	138
Derivatives Not Designated as Cash-Flow Hedging Instruments [Member] | Natural Gas Liquid Contracts [Member] | Derivative liability short-term [Member]
Derivatives, Fair Value [Line Items]
Derivative liabilities		$ (13)

X

- Definition

Fair value, after offset of derivative liability, of 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, before offset against an obligation to return collateral under a master netting arrangement. Includes assets elected not to be offset. Excludes assets not subject to a master netting arrangement.

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- Definition

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Fair value of the assets less the liabilities of a derivative or group of derivatives.

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