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Financial Instruments - Investments Measured at Fair Value on Recurring Basis (Detail) - USD ($) $ in Thousands | Jun. 30, 2017 | Dec. 31, 2016
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Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items] |  |
Total investments at fair value | $ 131,799 | $ 156,278
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 | 131,799 | 156,278
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 | 1,350 | 4,050
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 | 95,851 | 115,811
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 | 34,598 | 36,417
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 | 27,097 | 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 | 27,097 | 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 | 104,702 | 122,681
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 | 1,350 | 4,050
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 | 68,754 | 82,214
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 | $ 34,598 | $ 36,417

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