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INVESTMENTS - Additional Information (Detail) (USD $) | Sep. 30, 2014 | Jun. 30, 2014 | Dec. 31, 2013 Government Fund Mutual funds
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Schedule of Trading Securities and Other Trading Assets [Line Items] |  |  |
Carrying value of investments held | $ 23,100,000 |  |
Cost basis of investments held | 22,900,000 |  |
Other investments | 2,413,000 | 1,413,000 |
Carrying value of investments to Company's total assets | 70.00% |  |
Trading securities, at fair value | $ 17,586,000 | $ 17,817,000 | $ 14,100,000

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