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Financial Instruments - Investments from Continuing Operations (Detail) (USD $) In Thousands, unless otherwise specified | Jun. 30, 2013 | Dec. 31, 2012
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Schedule of Available-for-sale Securities [Line Items] |  |
Total investments (available for sale), Cost | $ 71,803 | $ 71,729
Short-term investments (available-for-sale), Gross Unrealized, Gain | 4 | 4
Short-term investments (available-for-sale), Gross Unrealized (Loss) | (478) | (475)
Short-term investments (available-for-sale), Fair value | 71,329 | 71,258
U.S. Treasury bills [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Short-term investments (available-for-sale), Cost | 63,953 | 63,879
Short-term investments (available-for-sale), Gross Unrealized, Gain | 4 | 4
Short-term investments (available-for-sale), Gross Unrealized (Loss) | (10) | (7)
Short-term investments (available-for-sale), Fair value | 63,947 | 63,876
Municipal bond [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Long-term investments (available-for-sale), Cost | 7,850 | 7,850
Long-term investments (available-for-sale), Gross Unrealized, Gain |  |
Long-term investments (available-for-sale), Gross Unrealized (Loss) | (468) | (468)
Short-term investments (available-for-sale), Fair value | 7,382 | 7,382
Long-term investments (available-for-sale), Fair value | $ 7,382 | $ 7,382

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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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