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Investments - Summary of Investments (Detail) - USD ($) $ in Thousands | Mar. 31, 2016 | Dec. 31, 2015
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Schedule of Available-for-sale Securities [Line Items] |  |
Total investments (available for sale), Cost | $ 130,765 | $ 123,128
Total investments (available for sale), Gross Unrealized Gain | 66 | 3
Total investments (available for sale), Gross Unrealized (Loss) | (598) | (856)
Total investments (available for sale), Fair value | 130,233 | 122,275
Municipal Bonds [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Total investments (available for sale), Fair value | 8,296 | 8,863
Non-governmental Debt Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Total investments (available for sale), Fair value | 84,906 | 76,757
Treasury and Federal Agencies [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Total investments (available for sale), Fair value | 37,031 | 36,655
Short-term Investments [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Total investments (available for sale), Cost | 122,915 | 115,278
Total investments (available for sale), Gross Unrealized Gain | 66 | 3
Total investments (available for sale), Gross Unrealized (Loss) | (122) | (380)
Total investments (available for sale), Fair value | 122,859 | 114,901
Short-term Investments [Member] | Municipal Bonds [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Total investments (available for sale), Cost | 930 | 1,500
Total investments (available for sale), Gross Unrealized (Loss) | (8) | (11)
Total investments (available for sale), Fair value | 922 | 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 | 84,965 | 76,999
Total investments (available for sale), Gross Unrealized Gain | 38 |
Total investments (available for sale), Gross Unrealized (Loss) | (97) | (242)
Total investments (available for sale), Fair value | 84,906 | 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 | 37,020 | 36,779
Total investments (available for sale), Gross Unrealized Gain | 28 | 3
Total investments (available for sale), Gross Unrealized (Loss) | (17) | (127)
Total investments (available for sale), Fair value | 37,031 | 36,655
Long Term Investments [Member] | Municipal Bonds [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Total investments (available for sale), Cost | 7,850 | 7,850
Total investments (available for sale), Gross Unrealized (Loss) | (476) | (476)
Total investments (available for sale), Fair value | $ 7,374 | $ 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=51813488&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=27724398&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=49167202&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=27724398&loc=d3e27161-111563 + Details
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- Definition Amount before tax of unrealized loss 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 (c) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27161-111563 + Details
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