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Financial Instruments - Investments from Continuing Operations (Detail) (USD $) In Thousands, unless otherwise specified | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2014 | Dec. 31, 2013
Schedule of Available-for-sale Securities [Line Items] |  |
Total investments, Cost | $ 118,829 | $ 39,441
Total investments, Gross Unrealized Gain | 13 | 1
Total investments, Gross Unrealized (Loss) | (734) | (476)
Total investments, Fair value | 118,108 | 38,966
Municipal Bond [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Total investments, Fair value | 14,203 | 7,374
Non-governmental Debt Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Total investments, Fair value | 88,769 |
Treasury and Federal Agencies [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Total investments, Fair value | 15,136 |
Short-term Investments [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Total investments, Cost | 110,979 |
Total investments, Gross Unrealized Gain | 13 |
Total investments, Gross Unrealized (Loss) | (258) |
Total investments, Fair value | 110,734 |
Short-term Investments [Member] | Municipal Bond [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Total investments, Cost | 6,874 |
Total investments, Gross Unrealized Gain | 1 |
Total investments, Gross Unrealized (Loss) | (46) |
Total investments, Fair value | 6,829 |
Short-term Investments [Member] | Non-governmental Debt Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Total investments, Cost | 88,948 |
Total investments, Gross Unrealized Gain | 8 |
Total investments, Gross Unrealized (Loss) | (187) |
Total investments, Fair value | 88,769 |
Short-term Investments [Member] | Treasury and Federal Agencies [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Total investments, Cost | 15,157 |
Total investments, Gross Unrealized Gain | 4 |
Total investments, Gross Unrealized (Loss) | (25) |
Total investments, Fair value | 15,136 |
Short-term Investments [Member] | U.S. Treasury Bills [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Total investments, Cost |  | 31,591
Total investments, Gross Unrealized Gain |  | 1
Total investments, Gross Unrealized (Loss) |  | 0
Total investments, Fair value |  | 31,592
Long Term Investments [Member] | Municipal Bond [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Total investments, Cost | 7,850 | 7,850
Total investments, Gross Unrealized Gain | 0 | 0
Total investments, Gross Unrealized (Loss) | (476) | (476)
Total investments, Fair value | $ 7,374 | $ 7,374

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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=28360136&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=6871852&loc=d3e26610-111562 + Details
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- Definition This item represents the cost of debt and equity securities, which are categorized neither as held-to-maturity nor trading, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.2) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Amount of unrealized gain before deducting unrealized loss on investments in debt and equity securities classified as available-for-sale securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27161-111563 + Details
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- Definition Amount of unrealized loss before deducting unrealized gain on investments in available-for-sale securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27161-111563 + Details
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