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Investments - Debt Securities and Other Investments, Included on Condensed Consolidated Balance Sheet and Recorded at Fair Value (Detail) - USD ($) $ in Thousands	Mar. 31, 2020	Jan. 01, 2020	Dec. 31, 2019
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	$ 37,569		$ 37,528
Gross Unrealized Gains	522		153
Gross Unrealized Losses	(231)		(21)
Fair Value	37,860	$ 37,700	37,660
Corporate Bonds [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	8,967		9,304
Gross Unrealized Gains	43		80
Gross Unrealized Losses	(87)
Fair Value	8,923		9,384
Municipal Fixed-Rate Bonds [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	931		930
Gross Unrealized Gains	3
Fair Value	934		930
Asset-Backed Bonds [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	6,052		6,867
Gross Unrealized Gains	17		26
Gross Unrealized Losses	(76)		(3)
Fair Value	5,993		6,890
Mortgage/Agency-Backed Bonds [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	8,389		6,944
Gross Unrealized Gains	140		26
Gross Unrealized Losses	(62)		(8)
Fair Value	8,467		6,962
U.S. Government Bonds [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	12,788		12,311
Gross Unrealized Gains	319		21
Gross Unrealized Losses	(6)		(9)
Fair Value	13,101		12,323
Other [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	442
Fair Value	$ 442
Foreign Government Bonds [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost			372
Gross Unrealized Losses			(1)
Fair Value			371
Variable Rate Demand Notes [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost			800
Fair Value			$ 800

X

- 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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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).

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Amortized cost of 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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Amount of 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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