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Financial Instruments - Summary of Investments (Detail) - USD ($) $ in Thousands | Sep. 30, 2016 | Dec. 31, 2015
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Schedule of Available-for-sale Securities [Line Items] |  |
Total investments (available for sale), Cost | $ 160,780 | $ 123,128
Total investments (available for sale), Gross Unrealized Gain | 60 | 3
Total investments (available for sale), Gross Unrealized (Loss) | (90) | (856)
Total investments (available for sale), Fair value | 160,750 | 122,275
Short-term Investments [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Total investments (available for sale), Cost | 151,183 | 115,278
Total investments (available for sale), Gross Unrealized Gain | 60 | 3
Total investments (available for sale), Gross Unrealized (Loss) | (90) | (380)
Total investments (available for sale), Fair value | 151,153 | 114,901
Short-term Investments [Member] | Municipal Bonds [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Total investments (available for sale), Cost | 2,250 | 1,500
Total investments (available for sale), Gross Unrealized (Loss) |  | (11)
Total investments (available for sale), Fair value | 2,250 | 1,489
Short-term Investments [Member] | Non-governmental Debt Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Total investments (available for sale), Cost | 108,987 | 76,999
Total investments (available for sale), Gross Unrealized Gain | 37 |
Total investments (available for sale), Gross Unrealized (Loss) | (67) | (242)
Total investments (available for sale), Fair value | 108,957 | 76,757
Short-term Investments [Member] | Treasury and Federal Agencies [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Total investments (available for sale), Cost | 39,946 | 36,779
Total investments (available for sale), Gross Unrealized Gain | 23 | 3
Total investments (available for sale), Gross Unrealized (Loss) | (23) | (127)
Total investments (available for sale), Fair value | 39,946 | 36,655
Restricted short-term investments [Member] | Non-governmental Debt Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Total investments (available for sale), Cost | 9,597 |
Total investments (available for sale), Fair value | $ 9,597 |
Long Term Investments [Member] | Municipal Bonds [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Total investments (available for sale), Cost |  | 7,850
Total investments (available for sale), Gross Unrealized (Loss) |  | (476)
Total investments (available for sale), Fair value |  | $ 7,374

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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=65884222&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=73527792&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=66010992&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=73527792&loc=d3e27161-111563 + Details
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