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Investments - Breakdown of Investments with Unrealized Losses (Detail) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
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Schedule of Available-for-sale Securities [Line Items] |  |
Continuous Unrealized Loss Position for Less than 12 Months, Fair Value | $ 21,135 | $ 27,002
Continuous Unrealized Loss Position for Less than 12 Months, Unrealized Losses | (123) | (109)
Continuous Unrealized Loss Position for 12 Months or Greater, Fair Value | 8,456 | 20,678
Continuous Unrealized Loss Position for 12 Months or Greater, Unrealized Losses | (147) | (308)
Total Fair Value | 29,591 | 47,680
Total Unrealized Losses | (270) | (417)
Corporate Bonds [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Continuous Unrealized Loss Position for Less than 12 Months, Fair Value | 11,129 | 16,015
Continuous Unrealized Loss Position for Less than 12 Months, Unrealized Losses | (60) | (58)
Continuous Unrealized Loss Position for 12 Months or Greater, Fair Value | 3,608 | 6,112
Continuous Unrealized Loss Position for 12 Months or Greater, Unrealized Losses | (52) | (97)
Total Fair Value | 14,737 | 22,127
Total Unrealized Losses | (112) | (155)
Municipal Fixed-Rate Bonds [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Continuous Unrealized Loss Position for Less than 12 Months, Fair Value |  | 230
Continuous Unrealized Loss Position for 12 Months or Greater, Fair Value | 1,136 | 1,165
Continuous Unrealized Loss Position for 12 Months or Greater, Unrealized Losses | (26) | (22)
Total Fair Value | 1,136 | 1,395
Total Unrealized Losses | (26) | (22)
Asset-Backed Bonds [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Continuous Unrealized Loss Position for Less than 12 Months, Fair Value | 1,874 | 4,941
Continuous Unrealized Loss Position for Less than 12 Months, Unrealized Losses | (2) | (17)
Continuous Unrealized Loss Position for 12 Months or Greater, Fair Value | 1,257 | 179
Continuous Unrealized Loss Position for 12 Months or Greater, Unrealized Losses | (12) | (3)
Total Fair Value | 3,131 | 5,120
Total Unrealized Losses | (14) | (20)
Mortgage/Agency-Backed Bonds [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Continuous Unrealized Loss Position for Less than 12 Months, Fair Value | 1,021 | 3,062
Continuous Unrealized Loss Position for Less than 12 Months, Unrealized Losses | (5) | (8)
Continuous Unrealized Loss Position for 12 Months or Greater, Fair Value | 1,918 | 1,673
Continuous Unrealized Loss Position for 12 Months or Greater, Unrealized Losses | (39) | (38)
Total Fair Value | 2,939 | 4,735
Total Unrealized Losses | (44) | (46)
U.S. Government Bonds [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Continuous Unrealized Loss Position for Less than 12 Months, Fair Value | 6,527 | 2,754
Continuous Unrealized Loss Position for Less than 12 Months, Unrealized Losses | (48) | (26)
Continuous Unrealized Loss Position for 12 Months or Greater, Fair Value | 537 | 11,549
Continuous Unrealized Loss Position for 12 Months or Greater, Unrealized Losses | (18) | (148)
Total Fair Value | 7,064 | 14,303
Total Unrealized Losses | (66) | $ (174)
Foreign Government Bonds [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Continuous Unrealized Loss Position for Less than 12 Months, Fair Value | 584 |
Continuous Unrealized Loss Position for Less than 12 Months, Unrealized Losses | (8) |
Total Fair Value | 584 |
Total Unrealized Losses | $ (8) |

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- Definition Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in continuous unrealized loss position for more than 12 months. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27337-111563 + Details
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