Fair Value Measurements - Derivative Assets and Liabilities Measured at Fair Value on a Recurring Basis (Detail) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Liabilities
Common stock warrants	$ (5,823)	$ (5,134)
Fair Value, Measurements, Recurring
Assets
Fair value of derivative asset	11,536	29,887
Derivative asset, fair value, gross liability	(3,660)	(23,601)
Derivative asset	7,876	6,286
Liabilities
Fair value of derivative liability	(19,666)	(49,424)
Derivative liability, fair value, gross asset	3,660	23,601
Derivative liability	(16,006)	(25,823)
Cash collateral	10,200	9,700
Interest Rate \| Fair Value, Measurements, Recurring
Assets
Fair value of derivative asset	3,672	3,602
Derivative asset, fair value, gross liability	(27)	(64)
Derivative asset	3,645	3,538
Liabilities
Fair value of derivative liability	(27)	(158)
Derivative liability, fair value, gross asset	27	64
Derivative liability	0	(94)
Level 1 \| Fair Value, Measurements, Recurring
Assets
Fair value of derivative asset	433	190
Liabilities
Fair value of derivative liability	(116)	(54)
Level 1 \| Interest Rate \| Fair Value, Measurements, Recurring
Assets
Fair value of derivative asset	0	0
Liabilities
Fair value of derivative liability	0	0
Level 2 \| Fair Value, Measurements, Recurring
Assets
Fair value of derivative asset	11,103	29,697
Liabilities
Fair value of derivative liability	(4,335)	(24,236)
Level 2 \| Interest Rate \| Fair Value, Measurements, Recurring
Assets
Fair value of derivative asset	3,672	3,602
Liabilities
Fair value of derivative liability	(27)	(158)
Level 3 \| Fair Value, Measurements, Recurring
Assets
Fair value of derivative asset	0	0
Liabilities
Fair value of derivative liability	(15,215)	(25,134)
Level 3 \| Interest Rate \| Fair Value, Measurements, Recurring
Assets
Fair value of derivative asset	0	0
Liabilities
Fair value of derivative liability	0	0
Exchange Traded \| Future \| Fair Value, Measurements, Recurring
Assets
Fair value of derivative asset	7,864	26,285
Derivative asset, fair value, gross liability	(3,633)	(23,537)
Derivative asset	4,231	2,748
Liabilities
Fair value of derivative liability	(4,424)	(24,132)
Derivative liability, fair value, gross asset	3,633	23,537
Derivative liability	(791)	(595)
Exchange Traded \| Embedded Derivative \| Fair Value, Measurements, Recurring
Liabilities
Fair value of derivative liability	(9,392)	(20,000)
Derivative liability, fair value, gross asset	0	0
Derivative liability	(9,392)	(20,000)
Exchange Traded \| Level 1 \| Future \| Fair Value, Measurements, Recurring
Assets
Fair value of derivative asset	433	190
Liabilities
Fair value of derivative liability	(116)	(54)
Exchange Traded \| Level 1 \| Embedded Derivative \| Fair Value, Measurements, Recurring
Liabilities
Fair value of derivative liability	0	0
Exchange Traded \| Level 2 \| Future \| Fair Value, Measurements, Recurring
Assets
Fair value of derivative asset	7,431	26,095
Liabilities
Fair value of derivative liability	(4,308)	(24,078)
Exchange Traded \| Level 2 \| Embedded Derivative \| Fair Value, Measurements, Recurring
Liabilities
Fair value of derivative liability	0	0
Exchange Traded \| Level 3 \| Future \| Fair Value, Measurements, Recurring
Assets
Fair value of derivative asset	0	0
Liabilities
Fair value of derivative liability	0	0
Exchange Traded \| Level 3 \| Embedded Derivative \| Fair Value, Measurements, Recurring
Liabilities
Fair value of derivative liability	(9,392)	(20,000)
Over the Counter \| Fair Value, Measurements, Recurring
Liabilities
Common stock warrants	(5,823)	(5,134)
Over the Counter \| Level 1 \| Fair Value, Measurements, Recurring
Liabilities
Common stock warrants	0	0
Over the Counter \| Level 2 \| Fair Value, Measurements, Recurring
Liabilities
Common stock warrants	0	0
Over the Counter \| Level 3 \| Fair Value, Measurements, Recurring
Liabilities
Common stock warrants	$ (5,823)	$ (5,134)

Fair value of liability associated with 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.

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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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Fair value, before 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 elected not to be offset. Excludes assets not subject to a master netting arrangement.

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Fair value, before 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 elected not to be offset. Excludes liabilities not subject to a master netting arrangement.

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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.

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Amount of right to receive cash collateral under master netting arrangements offset against derivative liabilities.

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Fair value of asset associated with 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.

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Value of outstanding derivative securities that permit the holder the right to purchase securities (usually equity) from the issuer at a specified price.

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