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Investments - Summary of Amortized Cost and Fair Value of Investments in Fixed Maturity Securities, Classified as Available-for-Sale (Detail) - USD ($) $ in Thousands | Sep. 30, 2018 | Dec. 31, 2017
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Investment [Line Items] |  |
Within one year, Amortized Cost | $ 73,298 |
After one year through five years, Amortized Cost | 165,853 |
After five years through ten years, Amortized Cost | 44,355 |
After ten years, Amortized Cost | 176,553 |
Fixed maturity, Cost or Amortized Cost | 473,315 | $ 461,236
Within one year, Fair Value | 73,137 |
After one year through five years, Fair Value | 163,342 |
After five years through ten years, Fair Value | 43,378 |
After ten years, Fair Value | 175,382 |
Total, Fair Value | 468,019 | 465,594
U.S. Agency-Based Mortgage-Backed Securities [Member] |  |
Investment [Line Items] |  |
Available-for-sale securities, Amortized Cost | 13,256 |
Fixed maturity, Cost or Amortized Cost | 13,256 | 18,813
Available-for-sale securities, Fair value | 12,780 |
Total, Fair Value | $ 12,780 | $ 18,014

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- Definition Amortized cost of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27161-111563 + Details
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- Definition Fair value of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), with single maturity date and allocated without single maturity date, maturing in next rolling fiscal year following latest fiscal year. For interim and annual periods when interim period is reported on rolling approach, from latest statement of financial position date. + References No definition available. + Details
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- Definition Amortized cost of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), with single maturity date and allocated without single maturity date, maturing after rolling tenth fiscal year following latest fiscal year. For interim and annual periods when interim period is reported on rolling approach, from latest statement of financial position date. + References No definition available. + Details
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- Definition Amortized cost of investment in debt security, measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), with single maturity date and allocated without single maturity date, maturing in rolling sixth through tenth fiscal year following latest fiscal year. For interim and annual periods when interim period is reported on rolling approach, from latest statement of financial position date. + References No definition available. + Details
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