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Derivative Instruments - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified						9 Months Ended
	Sep. 30, 2014	Dec. 31, 2013	Sep. 30, 2014 7.25% Senior Unsecured Notes due 2019	Sep. 30, 2014 Commodity contracts Entity	Sep. 30, 2014 Commodity contracts Credit Concentration Risk Entity	Sep. 30, 2014 Commodity contracts Natural Gas	Sep. 30, 2014 Commodity contracts Crude Oil
Derivative Instruments and Hedging Activities Disclosure [Line Items]
Third-party quoted forward prices						NYMEX Henry Hub gas	West Texas Intermediate crude oil
Annual interest rate			7.25%
Derivative assets	$ 22,252	$ 5,382		$ 22,300
Number of derivative counterparties				7	2

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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