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Financial Instruments - Investments from Continuing Operations (Detail) (USD $) In Thousands, unless otherwise specified | Jun. 30, 2014 | Dec. 31, 2013
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Schedule of Available-for-sale Securities [Line Items] |  |
Short-term investments (available-for-sale), Cost | $ 124,204 |
Total investments, Cost | 132,054 | 39,441
Short-term investments (available-for-sale), Gross Unrealized Gain | 24 |
Total investments, Gross Unrealized Gain | 24 | 1
Short-term investments (available-for-sale), Gross Unrealized (Loss) | (148) |
Total investments, Gross Unrealized (Loss) | (624) | (476)
Short-term investments (available-for-sale), Fair value | 124,080 |
Long-term investments (available-for-sale), Fair value | 7,374 | 7,374
Total investments, Fair value | 131,454 | 38,966
Municipal bond [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Short-term investments (available-for-sale), Cost | 6,907 |
Long-term investments (available-for-sale), Cost | 7,850 | 7,850
Short-term investments (available-for-sale), Gross Unrealized Gain | 1 |
Long-term investments (available-for-sale), Gross Unrealized Gain | 0 | 0
Short-term investments (available-for-sale), Gross Unrealized (Loss) | (27) |
Long-term investments (available-for-sale), Gross Unrealized (Loss) | (476) | (476)
Short-term investments (available-for-sale), Fair value | 6,881 |
Long-term investments (available-for-sale), Fair value | 7,374 | 7,374
Total investments, Fair value | 14,255 | 7,374
Non-governmental debt securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Short-term investments (available-for-sale), Cost | 98,828 |
Short-term investments (available-for-sale), Gross Unrealized Gain | 18 |
Short-term investments (available-for-sale), Gross Unrealized (Loss) | (109) |
Short-term investments (available-for-sale), Fair value | 98,737 |
Total investments, Fair value | 98,737 |
Treasury and federal agencies [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Short-term investments (available-for-sale), Cost | 18,469 |
Short-term investments (available-for-sale), Gross Unrealized Gain | 5 |
Short-term investments (available-for-sale), Gross Unrealized (Loss) | (12) |
Short-term investments (available-for-sale), Fair value | 18,462 |
Total investments, Fair value | 18,462 |
U.S. Treasury bills [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Short-term investments (available-for-sale), Cost |  | 31,591
Short-term investments (available-for-sale), Gross Unrealized Gain |  | 1
Short-term investments (available-for-sale), Gross Unrealized (Loss) |  | 0
Short-term investments (available-for-sale), Fair value |  | $ 31,592

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