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Financial Instruments - Summary of Investments (Detail) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
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Schedule of Available-for-sale Securities [Line Items] |  |
Total investments (available for sale), Cost | $ 161,596 | $ 156,432
Total investments (available for sale), Gross Unrealized Gain | 7 | 32
Total investments (available for sale), Gross Unrealized (Loss) | (355) | (186)
Total investments (available for sale), Fair value | 161,248 | 156,278
Short-term Investments [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Total investments (available for sale), Cost | 156,526 | 147,835
Total investments (available for sale), Gross Unrealized Gain | 7 | 32
Total investments (available for sale), Gross Unrealized (Loss) | (355) | (186)
Total investments (available for sale), Fair value | 156,178 | 147,681
Short-term Investments [Member] | Municipal Bonds [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Total investments (available for sale), Cost | 830 | 4,050
Total investments (available for sale), Fair value | 830 | 4,050
Short-term Investments [Member] | Non-governmental Debt Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Total investments (available for sale), Cost | 125,485 | 107,305
Total investments (available for sale), Gross Unrealized Gain | 7 | 22
Total investments (available for sale), Gross Unrealized (Loss) | (222) | (113)
Total investments (available for sale), Fair value | 125,270 | 107,214
Short-term Investments [Member] | Treasury and Federal Agencies [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Total investments (available for sale), Cost | 30,211 | 36,480
Total investments (available for sale), Gross Unrealized Gain |  | 10
Total investments (available for sale), Gross Unrealized (Loss) | (133) | (73)
Total investments (available for sale), Fair value | 30,078 | 36,417
Restricted short-term investments [Member] | Non-governmental Debt Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Total investments (available for sale), Cost | 5,070 | 8,597
Total investments (available for sale), Fair value | $ 5,070 | $ 8,597

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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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