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Investments - Summary of Investments (Detail) - USD ($) $ in Thousands | Dec. 31, 2015 | Dec. 31, 2014
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Schedule of Available-for-sale Securities [Line Items] |  |
Total investments (available for sale), Cost | $ 123,128 | $ 131,058
Total investments (available for sale), Gross Unrealized Gain | 3 | 8
Total investments (available for sale), Gross Unrealized (Loss) | (856) | (834)
Total investments (available for sale), Fair value | 122,275 | 130,232
Municipal Bonds [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Total investments (available for sale), Fair value | 8,863 | 14,199
Non-governmental Debt Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Total investments (available for sale), Fair value | 76,757 | 98,130
Treasury and Federal Agencies [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Total investments (available for sale), Fair value | 36,655 | 17,903
Short-term Investments [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Total investments (available for sale), Cost | 115,278 | 123,208
Total investments (available for sale), Gross Unrealized Gain | 3 | 8
Total investments (available for sale), Gross Unrealized (Loss) | (380) | (358)
Total investments (available for sale), Fair value | 114,901 | 122,858
Short-term Investments [Member] | Municipal Bonds [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Total investments (available for sale), Cost | 1,500 | 6,880
Total investments (available for sale), Gross Unrealized Gain |  | 1
Total investments (available for sale), Gross Unrealized (Loss) | (11) | (56)
Total investments (available for sale), Fair value | 1,489 | 6,825
Short-term Investments [Member] | Non-governmental Debt Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Total investments (available for sale), Cost | 76,999 | 98,400
Total investments (available for sale), Gross Unrealized Gain |  | 1
Total investments (available for sale), Gross Unrealized (Loss) | (242) | (271)
Total investments (available for sale), Fair value | 76,757 | 98,130
Short-term Investments [Member] | Treasury and Federal Agencies [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Total investments (available for sale), Cost | 36,779 | 17,928
Total investments (available for sale), Gross Unrealized Gain | 3 | 6
Total investments (available for sale), Gross Unrealized (Loss) | (127) | (31)
Total investments (available for sale), Fair value | 36,655 | 17,903
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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