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Realized and Net Change in Unrealized Gains (Losses) on Investments (Detail) (USD $)
In Thousands, unless otherwise specified |
3 Months Ended | 9 Months Ended | ||
|---|---|---|---|---|
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Sep. 30, 2014
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Sep. 30, 2013
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Sep. 30, 2014
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Sep. 30, 2013
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| Gain (Loss) on Investments [Line Items] | ||||
| Realized Gains (Losses) | $ (460) | $ (168) | $ 5,152 | $ 13,938 |
| Net Change in Unrealized Gains (Losses) | 239 | 1,331 | (6,252) | (11,170) |
| Total realized and net change in unrealized gains (losses) | $ (221) | $ 1,163 | $ (1,100) | $ 2,768 |