Fair Value Measurements - Derivative Assets and Liabilities Measured at Fair Value on a Recurring Basis (Detail) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Liabilities
Common stock warrants	$ (5,134)	$ (8,096)
Fair Value, Measurements, Recurring
Assets
Fair value of derivative asset	29,887	44,036
Derivative asset, fair value, gross liability	(23,601)	(39,459)
Derivative asset	6,286	4,577
Liabilities
Fair value of derivative liability	(49,424)	(79,785)
Derivative liability, fair value, gross asset	23,601	39,459
Derivative liability	(25,823)	(40,326)
Cash collateral	9,700	28,000
Interest Rate Contract \| Fair Value, Measurements, Recurring
Assets
Fair value of derivative asset	3,602
Derivative asset, fair value, gross liability	(64)
Derivative asset	3,538
Liabilities
Fair value of derivative liability	(158)
Derivative liability, fair value, gross asset	64
Derivative liability	(94)
Fair Value, Inputs, Level 1 \| Fair Value, Measurements, Recurring
Assets
Fair value of derivative asset	190	429
Liabilities
Fair value of derivative liability	(54)	(396)
Fair Value, Inputs, Level 1 \| Interest Rate Contract \| Fair Value, Measurements, Recurring
Assets
Fair value of derivative asset	0
Liabilities
Fair value of derivative liability	0
Fair Value, Inputs, Level 2 \| Fair Value, Measurements, Recurring
Assets
Fair value of derivative asset	29,697	33,797
Liabilities
Fair value of derivative liability	(24,236)	(43,712)
Fair Value, Inputs, Level 2 \| Interest Rate Contract \| Fair Value, Measurements, Recurring
Assets
Fair value of derivative asset	3,602
Liabilities
Fair value of derivative liability	(158)
Fair Value, Inputs, Level 3 \| Fair Value, Measurements, Recurring
Assets
Fair value of derivative asset	0	9,810
Liabilities
Fair value of derivative liability	(25,134)	(35,677)
Fair Value, Inputs, Level 3 \| Interest Rate Contract \| Fair Value, Measurements, Recurring
Assets
Fair value of derivative asset	0
Liabilities
Fair value of derivative liability	0
Exchange Traded \| Future \| Fair Value, Measurements, Recurring
Assets
Fair value of derivative asset	26,285	34,226
Derivative asset, fair value, gross liability	(23,537)	(29,649)
Derivative asset	2,748	4,577
Liabilities
Fair value of derivative liability	(24,132)	(44,108)
Derivative liability, fair value, gross asset	23,537	29,649
Derivative liability	(595)	(14,459)
Exchange Traded \| Equity Option \| Fair Value, Measurements, Recurring
Assets
Fair value of derivative asset		9,810
Derivative asset, fair value, gross liability		(9,810)
Derivative asset		0
Exchange Traded \| Embedded Derivative \| Fair Value, Measurements, Recurring
Liabilities
Fair value of derivative liability	(20,000)	0
Derivative liability, fair value, gross asset	0	9,810
Derivative liability	(20,000)	9,810
Exchange Traded \| Fair Value, Inputs, Level 1 \| Future \| Fair Value, Measurements, Recurring
Assets
Fair value of derivative asset	190	429
Liabilities
Fair value of derivative liability	(54)	(396)
Exchange Traded \| Fair Value, Inputs, Level 1 \| Equity Option \| Fair Value, Measurements, Recurring
Assets
Fair value of derivative asset		0
Exchange Traded \| Fair Value, Inputs, Level 1 \| Embedded Derivative \| Fair Value, Measurements, Recurring
Liabilities
Fair value of derivative liability	0	0
Exchange Traded \| Fair Value, Inputs, Level 2 \| Future \| Fair Value, Measurements, Recurring
Assets
Fair value of derivative asset	26,095	33,797
Liabilities
Fair value of derivative liability	(24,078)	(43,712)
Exchange Traded \| Fair Value, Inputs, Level 2 \| Equity Option \| Fair Value, Measurements, Recurring
Assets
Fair value of derivative asset		0
Exchange Traded \| Fair Value, Inputs, Level 2 \| Embedded Derivative \| Fair Value, Measurements, Recurring
Liabilities
Fair value of derivative liability	0	0
Exchange Traded \| Fair Value, Inputs, 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 \| Fair Value, Inputs, Level 3 \| Equity Option \| Fair Value, Measurements, Recurring
Assets
Fair value of derivative asset		9,810
Exchange Traded \| Fair Value, Inputs, Level 3 \| Embedded Derivative \| Fair Value, Measurements, Recurring
Liabilities
Fair value of derivative liability	(20,000)	0
Over the Counter \| Fair Value, Measurements, Recurring
Liabilities
Common stock warrants	(5,134)	(8,096)
Contingent consideration	0	(27,581)
Over the Counter \| Fair Value, Inputs, Level 1 \| Fair Value, Measurements, Recurring
Liabilities
Common stock warrants	0	0
Contingent consideration	0	0
Over the Counter \| Fair Value, Inputs, Level 2 \| Fair Value, Measurements, Recurring
Liabilities
Common stock warrants	0	0
Contingent consideration	0	0
Over the Counter \| Fair Value, Inputs, Level 3 \| Fair Value, Measurements, Recurring
Liabilities
Common stock warrants	(5,134)	(8,096)
Contingent consideration	$ 0	$ (27,581)

Contingent Consideration, Earn Out Provision, Fair Value Disclosure

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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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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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