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Financial Instruments - Investments from Continuing Operations (Detail) (USD $) In Thousands, unless otherwise specified | Mar. 31, 2014 | Dec. 31, 2013
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Schedule of Available-for-sale Securities [Line Items] |  |
Short-term investments (available-for-sale), Cost | $ 38,337 |
Long-term investments (available-for-sale), Cost | 16,573 |
Total investments (available for sale), Cost | 54,910 | 39,441
Short-term investments (available-for-sale), Gross Unrealized, Gain | 1 |
Long-term investments (available-for-sale), Gross Unrealized, Gain |  |
Total investments (available for sale), Gross Unrealized, Gain | 1 | 1
Short-term investments (available-for-sale), Gross Unrealized (Loss) | (12) |
Long-term investments (available-for-sale), Gross Unrealized (Loss) | (493) |
Total investments (available for sale), Gross Unrealized (Loss) | (505) | (476)
Short-term investments (available-for-sale), Fair value | 54,406 | 38,966
Long-term investments (available-for-sale), Fair value | 16,080 |
Commercial paper [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Short-term investments (available-for-sale), Cost | 15,641 |
Short-term investments (available-for-sale), Gross Unrealized (Loss) | (5) |
Short-term investments (available-for-sale), Fair value | 15,636 |
Corporate bonds [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Short-term investments (available-for-sale), Cost | 5,443 |
Long-term investments (available-for-sale), Cost | 8,723 |
Long-term investments (available-for-sale), Gross Unrealized, Gain |  |
Short-term investments (available-for-sale), Gross Unrealized (Loss) | (7) |
Long-term investments (available-for-sale), Gross Unrealized (Loss) | (17) |
Short-term investments (available-for-sale), Fair value | 5,436 |
Long-term investments (available-for-sale), Fair value | 8,706 |
U.S. Treasury bills [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Short-term investments (available-for-sale), Cost | 17,253 | 31,591
Short-term investments (available-for-sale), Gross Unrealized, Gain | 1 | 1
Short-term investments (available-for-sale), Gross Unrealized (Loss) |  |
Short-term investments (available-for-sale), Fair value | 17,254 | 31,592
Short-term Investments [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Short-term investments (available-for-sale), Fair value | 38,326 |
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) | (476) | (476)
Short-term investments (available-for-sale), Fair value | 7,374 | 7,374
Long-term investments (available-for-sale), Fair value | $ 7,374 | $ 7,374

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