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Note 2. Investments and Restricted Cash (Detail) (USD $) | 3 Months Ended |  | 9 Months Ended
--- | --- | --- | ---
Sep. 30, 2012 | Dec. 31, 2011 | Sep. 30, 2012 Unrealized Losses [Member] | Sep. 30, 2012 Unrealized Gains [Member]
Long-term Investments | $ 9,023,000 | $ 3,923,000 |  |
Tax Basis of Investments, Cost for Income Tax Purposes | 6,800,000 | 3,500,000 |  |
Payments to Acquire Available-for-sale Securities, Equity | 3,300,000 |  |  |
Other Comprehensive Income (Loss), Unrealized Holding Gain (Loss) on Securities Arising During Period, before Tax |  |  | 2,900,000 | 600,000
Restricted Cash and Cash Equivalents, Noncurrent | $ 866,000 | $ 866,000 |  |

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