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Fair Value Measurements - Hierarchy of Inputs Used to Derive Fair Value of Company's Assets (Detail) (USD $)
In Thousands, unless otherwise specified
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Sep. 30, 2012
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Dec. 31, 2011
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| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
| Trading securities, at fair value |
$ 12,022 |
$ 4,032 |
| Available-for-sale securities, at fair value |
608 |
610 |
| Investment securities, at fair value |
12,630 |
4,642 |
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Equity securities [Member]
|
|
|
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
| Trading securities, at fair value |
5,689 |
2,656 |
|
Fixed income securities [Member]
|
|
|
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
| Trading securities, at fair value |
5,014 |
|
|
Short-term securities [Member]
|
|
|
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
| Trading securities, at fair value |
1,111 |
636 |
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Managed mutual funds [Member]
|
|
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| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
| Trading securities, at fair value |
208 |
740 |
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U.S. Treasury Notes [Member]
|
|
|
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
| Available-for-sale securities, at fair value |
608 |
610 |
|
Level 1 [Member]
|
|
|
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
| Investment securities, at fair value |
7,008 |
4,032 |
|
Level 1 [Member] | Equity securities [Member]
|
|
|
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
| Trading securities, at fair value |
5,689 |
2,656 |
|
Level 1 [Member] | Short-term securities [Member]
|
|
|
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
| Trading securities, at fair value |
1,111 |
636 |
|
Level 1 [Member] | Managed mutual funds [Member]
|
|
|
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
| Trading securities, at fair value |
208 |
740 |
|
Level 2 [Member]
|
|
|
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
| Investment securities, at fair value |
5,622 |
610 |
|
Level 2 [Member] | Fixed income securities [Member]
|
|
|
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
| Trading securities, at fair value |
5,014 |
|
|
Level 2 [Member] | U.S. Treasury Notes [Member]
|
|
|
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
| Available-for-sale securities, at fair value |
608 |
610 |
|
Level 3 [Member]
|
|
|
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
| Investment securities, at fair value |
|
|
|
Level 3 [Member] | Equity securities [Member]
|
|
|
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
| Trading securities, at fair value |
|
|
|
Level 3 [Member] | Fixed income securities [Member]
|
|
|
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
| Trading securities, at fair value |
|
|
|
Level 3 [Member] | Short-term securities [Member]
|
|
|
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
| Trading securities, at fair value |
|
|
|
Level 3 [Member] | Managed mutual funds [Member]
|
|
|
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
| Trading securities, at fair value |
|
|
|
Level 3 [Member] | U.S. Treasury Notes [Member]
|
|
|
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
| Available-for-sale securities, at fair value |
|
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