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Summary of Significant Accounting Policies - Additional Information 2 (Detail) (USD $)	12 Months Ended
	Dec. 31, 2013 bbl	Dec. 31, 2014
Operations And Summary Of Significant Accounting Policies [Line Items]
Derivative financial instruments		$ 0us-gaap_DerivativeAssets
Quantity of barrels in swap agreements	1,985,000
Level 1
Operations And Summary Of Significant Accounting Policies [Line Items]
Cash held in bank accounts		2,100,000
Level 2
Operations And Summary Of Significant Accounting Policies [Line Items]
Derivative financial instruments	970,000	$ 0

Fair value, after the effects of master netting arrangements, of a 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. Includes assets not subject to a master netting arrangement and not elected to be offset.

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