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Investment Securities - Company's Investment Securities Holdings (Detail) (USD $)
In Thousands, unless otherwise specified |
9 Months Ended | 12 Months Ended |
|---|---|---|
|
Sep. 30, 2012
|
Dec. 31, 2011
|
|
| Investment Holdings [Line Items] | ||
| Cost | $ 606 | $ 606 |
| Unrealized Gains | 2 | 4 |
| Unrealized Losses | ||
| Fair Value | 608 | 610 |
| Fair Value | 12,022 | 4,032 |
| Total investment securities | 12,630 | 4,642 |
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Equity securities [Member]
|
||
| Investment Holdings [Line Items] | ||
| Fair Value | 5,689 | 2,656 |
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Fixed income securities [Member]
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||
| Investment Holdings [Line Items] | ||
| Fair Value | 5,014 | |
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Short-term securities [Member]
|
||
| Investment Holdings [Line Items] | ||
| Fair Value | 1,111 | 636 |
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Managed mutual funds [Member]
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||
| Investment Holdings [Line Items] | ||
| Fair Value | 208 | 740 |
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US Treasury Note (0.375%, 9/30/2012) [Member]
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||
| Investment Holdings [Line Items] | ||
| Percentage of Notes | 0.375% | 0.375% |
| Cost | 504 | 504 |
| Unrealized Gains | 2 | 2 |
| Unrealized Losses | ||
| Fair Value | 506 | 506 |
|
US Treasury Note (1.75%, 1/31/2014) [Member]
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||
| Investment Holdings [Line Items] | ||
| Percentage of Notes | 1.75% | 1.75% |
| Cost | 102 | 102 |
| Unrealized Gains | 2 | |
| Unrealized Losses | ||
| Fair Value | $ 102 | $ 104 |