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Financial Instruments - Summary of Investments (Detail) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
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Schedule of Available-for-sale Securities [Line Items] |  |
Total short-term investments (available for sale), Cost |  | $ 161,596
Total short-term investments (available for sale), Gross Unrealized Gain |  | 7
Total short-term investments (available for sale), Gross Unrealized (Loss) |  | (355)
Total short-term investments (available for sale), Fair value |  | 161,248
Short-term, Municipal Bonds [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Total short-term investments (available for sale), Cost |  | 830
Total short-term investments (available for sale), Fair value |  | 830
Short-term, Non-governmental Debt Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Total short-term investments (available for sale), Cost | $ 179,393 | 125,485
Total short-term investments (available for sale), Gross Unrealized Gain | 35 | 7
Total short-term investments (available for sale), Gross Unrealized (Loss) | (337) | (222)
Total short-term investments (available for sale), Fair value | 179,091 | 125,270
Short-term, Treasury and Federal Agencies [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Total short-term investments (available for sale), Cost | 17,417 | 30,211
Total short-term investments (available for sale), Gross Unrealized Gain | 5 |
Total short-term investments (available for sale), Gross Unrealized (Loss) | (85) | (133)
Total short-term investments (available for sale), Fair value | 17,337 | 30,078
Short-term Investments [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Total short-term investments (available for sale), Cost | 196,810 | 156,526
Total short-term investments (available for sale), Gross Unrealized Gain | 40 | 7
Total short-term investments (available for sale), Gross Unrealized (Loss) | (422) | (355)
Total short-term investments (available for sale), Fair value | $ 196,428 | 156,178
Restricted short-term, Non-governmental Debt Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Total short-term investments (available for sale), Cost |  | 5,070
Total short-term investments (available for sale), Fair value |  | $ 5,070

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