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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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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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