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Short-Term and Long-Term Investments - Additional Information (Detail) - USD ($) | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Unrealized Losses On Short Term And Long Term Investments [Line Items] |  |  |  |
Amortized cost of securities | $ 3,340,000 | $ 3,700,000 |  |
Minimum period for which failed auction securities been in unrealized loss position | 12 months |  |  |
Estimated Fair Value | $ 2,866,000 | 3,272,000 |  |
Gross unrealized losses | 474,000 | 428,000 |  |
Aggregate credit loss | 72,000 | 84,000 | $ 395,000 | $ 317,000
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 | $ 2,526,000 | 2,575,000 |  |
Gross unrealized losses | 474,000 | $ 425,000 |  |
Aggregate credit loss | 72,000 |  |  |
Aggregate temporary impairment loss | $ 402,000 |  |  |

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- Definition Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 25 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=51813488&loc=d3e22054-111558 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27232-111563 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=49167202&loc=d3e26610-111562 + Details
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