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Long-Term Investments - Additional Information (Detail) - USD ($) | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Unrealized Losses On Short Term And Long Term Investments [Line Items] |  |  |  |
Amortized cost of securities |  | $ 3,340,000 |  |
Minimum period for which failed auction securities been in unrealized loss position | 12 months |  |  |
Estimated Fair Value |  | 2,866,000 |  |
Gross unrealized losses |  | 474,000 |  |
Aggregate credit loss | $ 59,000 | 72,000 | $ 84,000 | $ 395,000
Failed Auction Security [Member] |  |  |  |
Unrealized Losses On Short Term And Long Term Investments [Line Items] |  |  |  |
Amortized cost of securities | $ 3,000,000 | 3,000,000 |  |
Period for which failed auction securities been in unrealized loss position | Exceeds 12 months |  |  |
Estimated Fair Value | $ 2,508,000 | 2,526,000 |  |
Gross unrealized losses | 492,000 | $ 474,000 |  |
Aggregate credit loss | 59,000 |  |  |
Aggregate temporary impairment loss | $ 433,000 |  |  |

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