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Cash, Cash Equivalents and Investments - Additional Information (Detail) (USD $) | 12 Months Ended | 3 Months Ended
--- | --- | ---
Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2012 Equity securities [Member]
Schedule of Available-for-sale Securities [Line Items] |  |  |
Cash balance included foreign bank balance | $ 23,614,000 | $ 29,452,000 |
Purchase of equity securities |  |  | 2,136,000
Fair value |  |  | 2,131,000
Gross unrealized loss |  |  | 5,000
Gross realized gains on sale of debt securities | 1,990,000 | 82,000 |
Gross realized losses on sale of debt securities | 295,000 | 263,000 |
Maximum amount committed to invest in limited partnership | 20,500,000 |  |
Contribution to limited partnership | 19,886,000 |  |
Remaining amount of commitment in limited partnership | 614,000 |  |
Received a stock distribution | 2,193,000 |  |
Recorded a realized loss on stock distribution | 65,000 |  |
Shares were trading investment were sold | 2,128,000 |  |
Carrying value of investment | 3,740,000 |  |
Estimated fair value of investment | $ 6,932,000 |  |

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