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Investments - Debt Securities and Other Investments, Recorded at Either Fair Value or Cost (Detail) - USD ($) $ in Thousands | Jun. 30, 2018 | Dec. 31, 2017
--- | --- | ---
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | $ 65,791 | $ 62,857
Gross Unrealized Gains | 30 | 53
Gross Unrealized Losses | (514) | (417)
Available-for-sale debt securities, Carrying Value | 65,307 | 62,493
Restricted investment held at cost | 26,700 | 27,800
Other investments held at cost | 520 | 547
Total carrying value of available-for-sale investments | 92,527 | 90,840
Corporate Bonds [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 35,896 | 32,654
Gross Unrealized Gains | 27 | 44
Gross Unrealized Losses | (250) | (155)
Available-for-sale debt securities, Carrying Value | 35,673 | 32,543
Municipal Fixed-Rate Bonds [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 2,259 | 2,902
Gross Unrealized Gains |  | 2
Gross Unrealized Losses | (38) | (22)
Available-for-sale debt securities, Carrying Value | 2,221 | 2,882
Asset-Backed Bonds [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 10,355 | 6,545
Gross Unrealized Gains | 1 | 1
Gross Unrealized Losses | (37) | (20)
Available-for-sale debt securities, Carrying Value | 10,319 | 6,526
Mortgage/Agency-Backed Bonds [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 7,292 | 5,554
Gross Unrealized Gains |  | 1
Gross Unrealized Losses | (85) | (46)
Available-for-sale debt securities, Carrying Value | 7,207 | 5,509
U.S. Government Bonds [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 8,953 | 14,477
Gross Unrealized Losses | (104) | (174)
Available-for-sale debt securities, Carrying Value | 8,849 | 14,303
Foreign Government Bonds [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 1,036 | 725
Gross Unrealized Gains | 2 | 5
Available-for-sale debt securities, Carrying Value | $ 1,038 | $ 730

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- Definition Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on 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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27161-111563 + Details
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- Definition Amount, before tax, of unrealized loss in accumulated other comprehensive income (AOCI) on 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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27161-111563 + 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). + 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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