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Financial Instruments - Schedule of Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014
Assets
Derivative assets	$ 7,796	$ 16,927
Liabilities
Derivative liabilities	(126)	(170)
Fair Value, Measurements, Recurring [Member]
Assets
Derivative assets	7,796	16,927
Liabilities
Derivative liabilities	(126)	(170)
Commodity Derivative Contracts [Member] | Fair Value, Measurements, Recurring [Member]
Assets
Derivative assets	7,796	16,901
Interest Rate Derivative Contracts [Member] | Fair Value, Measurements, Recurring [Member]
Assets
Derivative assets		26
Liabilities
Derivative liabilities	(126)	(170)
Significant Unobservable Inputs (Level 3) [Member] | Fair Value, Measurements, Recurring [Member]
Assets
Derivative assets	7,796	16,927
Liabilities
Derivative liabilities	(126)	(170)
Significant Unobservable Inputs (Level 3) [Member] | Commodity Derivative Contracts [Member] | Fair Value, Measurements, Recurring [Member]
Assets
Derivative assets	7,796	16,901
Significant Unobservable Inputs (Level 3) [Member] | Interest Rate Derivative Contracts [Member] | Fair Value, Measurements, Recurring [Member]
Assets
Derivative assets		26
Liabilities
Derivative liabilities	$ (126)	$ (170)

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