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Investments - Debt Securities and Other Investments, Recorded at Either Fair Value or Cost (Detail) - USD ($) $ in Thousands | Mar. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | $ 35,044 | $ 41,042
Gross Unrealized Gains | 88 | 27
Gross Unrealized Losses | (85) | (270)
Available-for-sale debt securities, Carrying Value | 35,047 | 40,799
Restricted investment held at cost | 25,600 | 25,600
Other investments held at cost | 1,180 | 397
Total carrying value of available-for-sale investments | 61,827 | 66,796
Corporate Bonds [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 15,964 | 20,777
Gross Unrealized Gains | 69 | 19
Gross Unrealized Losses | (24) | (112)
Available-for-sale debt securities, Carrying Value | 16,009 | 20,684
Municipal Fixed-Rate Bonds [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 951 | 1,339
Gross Unrealized Losses | (13) | (26)
Available-for-sale debt securities, Carrying Value | 938 | 1,313
Asset-Backed Bonds [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 7,171 | 5,230
Gross Unrealized Gains | 13 | 5
Gross Unrealized Losses | (9) | (14)
Available-for-sale debt securities, Carrying Value | 7,175 | 5,221
Mortgage/Agency-Backed Bonds [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 4,561 | 3,833
Gross Unrealized Gains | 6 | 2
Gross Unrealized Losses | (26) | (44)
Available-for-sale debt securities, Carrying Value | 4,541 | 3,791
U.S. Government Bonds [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 4,238 | 9,271
Gross Unrealized Gains |  | 1
Gross Unrealized Losses | (11) | (66)
Available-for-sale debt securities, Carrying Value | 4,227 | 9,206
Foreign Government Bonds [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 2,159 | 592
Gross Unrealized Losses | (2) | (8)
Available-for-sale debt securities, Carrying Value | $ 2,157 | $ 584

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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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