|
Securities Carried at Fair value (Detail) (USD $)
In Thousands
|
Jun. 30, 2012
|
Dec. 31, 2011
|
| Security Owned and Sold, Not yet Purchased, at Fair Value [Line Items] |
|
|
| Securities owned at fair value |
$ 1,336 |
$ 2,014 |
| Securities sold, but not yet purchased |
64 |
78 |
|
Fair Value, Inputs, Level 2 | Portion at Fair Value, Fair Value Disclosure
|
|
|
| Security Owned and Sold, Not yet Purchased, at Fair Value [Line Items] |
|
|
| Securities owned at fair value |
1,008 |
1,823 |
|
Portion at Fair Value, Fair Value Disclosure
|
|
|
| Security Owned and Sold, Not yet Purchased, at Fair Value [Line Items] |
|
|
| Securities owned at fair value |
1,336 |
2,014 |
|
Portion at Fair Value, Fair Value Disclosure | Common stock and warrants | Fair Value, Inputs, Level 2
|
|
|
| Security Owned and Sold, Not yet Purchased, at Fair Value [Line Items] |
|
|
| Securities owned at fair value |
1,008 |
|
|
Portion at Fair Value, Fair Value Disclosure | Common stock and warrants
|
|
|
| Security Owned and Sold, Not yet Purchased, at Fair Value [Line Items] |
|
|
| Securities owned at fair value |
1,336 |
2,014 |
|
Portion at Fair Value, Fair Value Disclosure | Common stock and warrants | Fair Value, Inputs, Level 1
|
|
|
| Security Owned and Sold, Not yet Purchased, at Fair Value [Line Items] |
|
|
| Securities owned at fair value |
328 |
191 |
|
Portion at Fair Value, Fair Value Disclosure | Fair Value, Inputs, Level 1
|
|
|
| Security Owned and Sold, Not yet Purchased, at Fair Value [Line Items] |
|
|
| Securities owned at fair value |
328 |
191 |
|
Common stock and warrants | Fair Value, Inputs, Level 2 | Portion at Fair Value, Fair Value Disclosure
|
|
|
| Security Owned and Sold, Not yet Purchased, at Fair Value [Line Items] |
|
|
| Securities owned at fair value |
|
1,823 |
|
Common stock and warrants
|
|
|
| Security Owned and Sold, Not yet Purchased, at Fair Value [Line Items] |
|
|
| Securities owned at fair value |
328 |
191 |
| Securities sold, but not yet purchased |
64 |
78 |
|
Common stock and warrants | Fair Value, Inputs, Level 1
|
|
|
| Security Owned and Sold, Not yet Purchased, at Fair Value [Line Items] |
|
|
| Securities sold, but not yet purchased |
54 |
68 |
|
Common stock and warrants | Fair Value, Inputs, Level 2
|
|
|
| Security Owned and Sold, Not yet Purchased, at Fair Value [Line Items] |
|
|
| Securities sold, but not yet purchased |
10 |
10 |
|
Fair Value, Inputs, Level 1
|
|
|
| Security Owned and Sold, Not yet Purchased, at Fair Value [Line Items] |
|
|
| Securities sold, but not yet purchased |
54 |
68 |
|
Fair Value, Inputs, Level 2
|
|
|
| Security Owned and Sold, Not yet Purchased, at Fair Value [Line Items] |
|
|
| Securities sold, but not yet purchased |
$ 10 |
$ 10 |