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Fair Value Measurements - Derivative Assets and Liabilities Measured at Fair Value on a Recurring Basis (Detail) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Liabilities |  |
Common stock warrants | $ (6,808) | $ (5,134)
Fair Value, Measurements, Recurring |  |
Assets |  |
Fair value of derivative asset | 26,274 | 29,887
Derivative asset, fair value, gross liability | (19,650) | (23,601)
Derivative asset | 6,624 | 6,286
Liabilities |  |
Fair value of derivative liability | (46,061) | (49,424)
Derivative liability, fair value, gross asset | 19,650 | 23,601
Derivative liability | (26,411) | (25,823)
Cash collateral | 7,200 | 9,700
Interest rate derivatives | Fair Value, Measurements, Recurring |  |
Assets |  |
Fair value of derivative asset | 3,810 | 3,602
Derivative asset, fair value, gross liability | 0 | (64)
Derivative asset | 3,810 | 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 | 557 | 190
Liabilities |  |
Fair value of derivative liability | (596) | (54)
Fair Value, Inputs, Level 1 | Interest rate derivatives | Fair Value, Measurements, Recurring |  |
Assets |  |
Fair value of derivative asset | 0 | 0
Liabilities |  |
Fair value of derivative liability |  | 0
Fair Value, Inputs, Level 2 | Fair Value, Measurements, Recurring |  |
Assets |  |
Fair value of derivative asset | 25,717 | 29,697
Liabilities |  |
Fair value of derivative liability | (19,093) | (24,236)
Fair Value, Inputs, Level 2 | Interest rate derivatives | Fair Value, Measurements, Recurring |  |
Assets |  |
Fair value of derivative asset | 3,810 | 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 | 0
Liabilities |  |
Fair value of derivative liability | (26,372) | (25,134)
Fair Value, Inputs, Level 3 | Interest rate derivatives | Fair Value, Measurements, Recurring |  |
Assets |  |
Fair value of derivative asset | 0 | 0
Liabilities |  |
Fair value of derivative liability |  | 0
Exchange Traded | Future | Fair Value, Measurements, Recurring |  |
Assets |  |
Fair value of derivative asset | 22,464 | 26,285
Derivative asset, fair value, gross liability | (19,650) | (23,537)
Derivative asset | 2,814 | 2,748
Liabilities |  |
Fair value of derivative liability | (19,689) | (24,132)
Derivative liability, fair value, gross asset | 19,650 | 23,537
Derivative liability | (39) | (595)
Exchange Traded | J. Aron repurchase obligation derivative | Fair Value, Measurements, Recurring |  |
Liabilities |  |
Fair value of derivative liability | (19,564) | (20,000)
Derivative liability, fair value, gross asset | 0 | 0
Derivative liability | (19,564) | (20,000)
Exchange Traded | Fair Value, Inputs, Level 1 | Future | Fair Value, Measurements, Recurring |  |
Assets |  |
Fair value of derivative asset | 557 | 190
Liabilities |  |
Fair value of derivative liability | (596) | (54)
Exchange Traded | Fair Value, Inputs, Level 1 | J. Aron repurchase obligation 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 | 21,907 | 26,095
Liabilities |  |
Fair value of derivative liability | (19,093) | (24,078)
Exchange Traded | Fair Value, Inputs, Level 2 | J. Aron repurchase obligation 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 | J. Aron repurchase obligation derivative | Fair Value, Measurements, Recurring |  |
Liabilities |  |
Fair value of derivative liability | (19,564) | (20,000)
Over the Counter | Fair Value, Measurements, Recurring |  |
Liabilities |  |
Common stock warrants | (6,808) | (5,134)
Derivative liability, fair value, gross asset | 0 | 0
Over the Counter | Fair Value, Inputs, Level 1 | Fair Value, Measurements, Recurring |  |
Liabilities |  |
Common stock warrants | 0 | 0
Over the Counter | Fair Value, Inputs, Level 2 | Fair Value, Measurements, Recurring |  |
Liabilities |  |
Common stock warrants | 0 | 0
Over the Counter | Fair Value, Inputs, Level 3 | Fair Value, Measurements, Recurring |  |
Liabilities |  |
Common stock warrants | $ (6,808) | $ (5,134)

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