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Investments - Investments Measured at Fair Value on Recurring Basis (Detail) - USD ($) $ in Thousands | Dec. 31, 2016 | Dec. 31, 2015
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Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items] |  |
Total investments at fair value | $ 156,278 | $ 122,275
Fair Value Measurements on Recurring Basis [Member] |  |
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items] |  |
Total investments at fair value | 156,278 | 122,275
Fair Value Measurements on Recurring Basis [Member] | Municipal Bonds [Member] |  |
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items] |  |
Total investments at fair value | 4,050 | 8,863
Fair Value Measurements on Recurring Basis [Member] | Non-governmental Debt Securities [Member] |  |
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items] |  |
Total investments at fair value | 115,811 | 76,757
Fair Value Measurements on Recurring Basis [Member] | Treasury and Federal Agencies [Member] |  |
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items] |  |
Total investments at fair value | 36,417 | 36,655
Fair Value Measurements on Recurring Basis [Member] | Level 1 [Member] |  |
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items] |  |
Total investments at fair value | 33,597 |
Fair Value Measurements on Recurring Basis [Member] | Level 1 [Member] | Non-governmental Debt Securities [Member] |  |
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items] |  |
Total investments at fair value | 33,597 |
Fair Value Measurements on Recurring Basis [Member] | Level 2 [Member] |  |
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items] |  |
Total investments at fair value | 122,681 | 114,901
Fair Value Measurements on Recurring Basis [Member] | Level 2 [Member] | Municipal Bonds [Member] |  |
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items] |  |
Total investments at fair value | 4,050 | 1,489
Fair Value Measurements on Recurring Basis [Member] | Level 2 [Member] | Non-governmental Debt Securities [Member] |  |
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items] |  |
Total investments at fair value | 82,214 | 76,757
Fair Value Measurements on Recurring Basis [Member] | Level 2 [Member] | Treasury and Federal Agencies [Member] |  |
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items] |  |
Total investments at fair value | $ 36,417 | 36,655
Fair Value Measurements on Recurring Basis [Member] | Level 3 [Member] |  |
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items] |  |
Total investments at fair value |  | 7,374
Fair Value Measurements on Recurring Basis [Member] | Level 3 [Member] | Municipal Bonds [Member] |  |
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items] |  |
Total investments at 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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