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Fair Value Measurements - Valuation of Financial Instruments that are Marked-to-Market on Recurring Basis (Detail) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Assets
Estimated Fair Value	$ 170,831	$ 168,934
Fair Value Measurements Recurring
Assets
Estimated Fair Value	170,831	168,934
Derivative instruments	25,410	5,238
Total earning assets	196,241	174,172
Liabilities
Derivative Liability	(38,063)	(28,688)
Fair Value Measurements Recurring \| Level 1
Assets
Estimated Fair Value	0	0
Derivative instruments	0	0
Total earning assets	0	0
Liabilities
Derivative Liability	0	0
Fair Value Measurements Recurring \| Level 2
Assets
Estimated Fair Value	170,831	168,934
Derivative instruments	25,410	5,238
Total earning assets	196,241	174,172
Liabilities
Derivative Liability	(38,063)	(28,688)
Fair Value Measurements Recurring \| Level 3
Assets
Estimated Fair Value	0	0
Derivative instruments	0	0
Total earning assets	0	0
Liabilities
Derivative Liability	$ 0	$ 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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- Definition

Fair value, after the effects of master netting arrangements, of a financial liability or 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 liabilities not subject to a master netting arrangement and not elected to be offset.

+ References+ Details