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Investments - Additional Information (Detail) - USD ($) $ in Thousands | 9 Months Ended |
--- | --- | ---
Sep. 30, 2017 | Dec. 31, 2016
Schedule of Investments [Line Items] |  |
Restricted certificate of deposit held | $ 27,800 | $ 27,800
Identification of potential other-than-temporary impairments | 25.00% |
Alabama State Industrial Development Authority [Member] |  |
Schedule of Investments [Line Items] |  |
Maturity date of bond | Jan. 01, 2020 |
Percentage of interest on bond | 2.00% |
Alabama State Industrial Development Authority [Member] | Taxable Revenue Bond [Member] |  |
Schedule of Investments [Line Items] |  |
Collateral deposit against outstanding principal amount | $ 27,800 | 27,800
Alabama State Industrial Development Authority [Member] | Taxable Revenue Bond [Member] | Significant Other Observable Inputs (Level 2) [Member] |  |
Schedule of Investments [Line Items] |  |
Estimated fair value of bond | $ 28,000 | $ 28,100
Investment [Member] | Issuer Concentration [Member] | Market Value of Total Investment Portfolio [Member] |  |
Schedule of Investments [Line Items] |  |
Investment concentration risk percentage | 5.00% |

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