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Financial Instruments - Summary of Investments (Detail) - USD ($) $ in Thousands | Jun. 30, 2018 | Dec. 31, 2017
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Schedule of Available-for-sale Securities [Line Items] |  |
Total investments (available for sale), Cost | $ 156,599 | $ 161,596
Total investments (available for sale), Gross Unrealized Gain | 18 | 7
Total investments (available for sale), Gross Unrealized (Loss) | (476) | (355)
Total investments (available for sale), Fair value | 156,141 | 161,248
Short-term, Municipal Bonds [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Total investments (available for sale), Cost |  | 830
Total investments (available for sale), Fair value |  | 830
Short-term, Non-governmental Debt Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Total investments (available for sale), Cost | 128,511 | 125,485
Total investments (available for sale), Gross Unrealized Gain | 17 | 7
Total investments (available for sale), Gross Unrealized (Loss) | (336) | (222)
Total investments (available for sale), Fair value | 128,192 | 125,270
Short-term, Treasury and Federal Agencies [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Total investments (available for sale), Cost | 23,518 | 30,211
Total investments (available for sale), Gross Unrealized Gain | 1 |
Total investments (available for sale), Gross Unrealized (Loss) | (140) | (133)
Total investments (available for sale), Fair value | 23,379 | 30,078
Short-term Investments [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Total investments (available for sale), Cost | 152,029 | 156,526
Total investments (available for sale), Gross Unrealized Gain | 18 | 7
Total investments (available for sale), Gross Unrealized (Loss) | (476) | (355)
Total investments (available for sale), Fair value | 151,571 | 156,178
Restricted short-term, Non-governmental Debt Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Total investments (available for sale), Cost | 4,570 | 5,070
Total investments (available for sale), Fair value | $ 4,570 | $ 5,070

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