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Financial Instruments - Effect of Derivative Instruments on Condensed Consolidated Statements of Operations (Detail) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015
Derivative Instruments, Gain (Loss) [Line Items]
Amount of gain/loss recognized in income	$ (7)	$ 193
Derivatives Designated as Cash-Flow Hedging Instruments [Member] | Interest Rate Swap [Member] | Interest Expense [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Amount of gain/loss recognized in income	$ (7)	(146)
Derivatives Not Designated as Cash-Flow Hedging Instruments [Member] | Natural Gas Commodity Contracts [Member] | Unrealized Loss on Derivative Instruments, Net [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Amount of gain/loss recognized in income		(1,007)
Derivatives Not Designated as Cash-Flow Hedging Instruments [Member] | Natural Gas Commodity Contracts [Member] | Realized Gain (Loss) on Derivative Instruments, Net [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Amount of gain/loss recognized in income		1,358
Derivatives Not Designated as Cash-Flow Hedging Instruments [Member] | Crude Oil Commodity Contracts [Member] | Unrealized Loss on Derivative Instruments, Net [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Amount of gain/loss recognized in income		(8,098)
Derivatives Not Designated as Cash-Flow Hedging Instruments [Member] | Crude Oil Commodity Contracts [Member] | Realized Gain (Loss) on Derivative Instruments, Net [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Amount of gain/loss recognized in income		$ 8,086

X

- Definition

Amount of increase (decrease) in the fair value of derivatives recognized in the income statement.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4A
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=64837297&loc=SL5618551-113959

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4C
-Subparagraph (a),(c),(d),(e)
-URI http://asc.fasb.org/extlink&oid=64837297&loc=SL5624171-113959

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+ References

No definition available.

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