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Financial Instruments - Summary of Investments (Detail) - USD ($) $ in Thousands | Mar. 31, 2018 | Dec. 31, 2017
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Schedule of Available-for-sale Securities [Line Items] |  |
Total investments (available for sale), Cost | $ 163,175 | $ 161,596
Total investments (available for sale), Gross Unrealized Gain | 6 | 7
Total investments (available for sale), Gross Unrealized (Loss) | (573) | (355)
Total investments (available for sale), Fair value | 162,608 | 161,248
Short-term Investments [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Total investments (available for sale), Cost | 158,605 | 156,526
Total investments (available for sale), Gross Unrealized Gain | 6 | 7
Total investments (available for sale), Gross Unrealized (Loss) | (573) | (355)
Total investments (available for sale), Fair value | 158,038 | 156,178
Short-term Investments [Member] | Non-governmental Debt Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Total investments (available for sale), Cost | 128,641 | 125,485
Total investments (available for sale), Gross Unrealized Gain | 6 | 7
Total investments (available for sale), Gross Unrealized (Loss) | (415) | (222)
Total investments (available for sale), Fair value | 128,232 | 125,270
Short-term Investments [Member] | Treasury and Federal Agencies [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Total investments (available for sale), Cost | 29,964 | 30,211
Total investments (available for sale), Gross Unrealized (Loss) | (158) | (133)
Total investments (available for sale), Fair value | 29,806 | 30,078
Short-term Investments [Member] | 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
Restricted short-term investments [Member] | 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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- 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=75030427&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=82897076&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=82896770&loc=d3e26610-111562 + Details
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- Definition Amount before tax of unrealized gain in accumulated other comprehensive income (AOCI) on investments in debt and equity securities classified as available-for-sale. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27161-111563 + Details
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