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Summary of Impact of Derivative Financial Instruments to Condensed Consolidated Statements of Operations (Detail) (USD $)
In Thousands, unless otherwise specified |
3 Months Ended | 9 Months Ended | ||
|---|---|---|---|---|
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Sep. 30, 2013
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Sep. 30, 2012
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Sep. 30, 2013
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Sep. 30, 2012
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| Derivative Financial Instruments [Line Items] | ||||
| Hedge Ineffectiveness | $ 548 | |||
| Excluded from Assessment of Effectiveness | (938) | |||
| Realized Gain | 22,941 | |||
| Realized Gains (Losses) | 12,298 | (1,619) | 7,407 | (1,368) |
| Net Change in Unrealized Gain (Loss) | (13,854) | (9,086) | (11,011) | (2,173) |
|
Freestanding Derivatives | Interest Rate Contracts
|
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| Derivative Financial Instruments [Line Items] | ||||
| Realized Gains (Losses) | 359 | (189) | (596) | (2,740) |
| Net Change in Unrealized Gain (Loss) | (2,512) | 1,946 | (12,005) | 9,565 |
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Freestanding Derivatives | Foreign Currency Contracts
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| Derivative Financial Instruments [Line Items] | ||||
| Realized Gains (Losses) | 11,847 | (1,438) | 8,084 | 1,357 |
| Net Change in Unrealized Gain (Loss) | (11,553) | (11,027) | 1,083 | (11,692) |
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Freestanding Derivatives | Other
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| Derivative Financial Instruments [Line Items] | ||||
| Realized Gains (Losses) | 92 | 8 | (81) | 15 |
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Freestanding Derivatives | Credit Default Swaps
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| Derivative Financial Instruments [Line Items] | ||||
| Net Change in Unrealized Gain (Loss) | $ 211 | $ (5) | $ (89) | $ (46) |