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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).

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