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Fair Value - Presentation of Carrying Values and Fair Values of Certain of Company's Financial Instruments (Detail) (USD $)
In Thousands, unless otherwise specified |
Dec. 31, 2014
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Dec. 31, 2013
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|---|---|---|
| Assets: | ||
| Investments, available-for-sale | $ 125,085 | $ 130,248 |
| Other investments | 10,530 | 7,513 |
| Liabilities: | ||
| Debentures payable | 40,341 | 40,301 |
| Carrying Value [Member] | ||
| Assets: | ||
| Investments, available-for-sale | 125,085 | 130,248 |
| Other investments | 10,530 | 7,513 |
| Liabilities: | ||
| Debentures payable | 40,341 | 40,301 |
| Fair Value [Member] | ||
| Assets: | ||
| Investments, available-for-sale | 125,085 | 130,248 |
| Other investments | 10,530 | 7,513 |
| Liabilities: | ||
| Debentures payable | $ 19,606 | $ 15,006 |