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Investments - Debt Securities and Other Investments, Included on Consolidated Balance Sheet and Recorded at Fair Value (Detail) - USD ($) $ in Thousands	Dec. 31, 2020	Jan. 01, 2020	Dec. 31, 2019
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	$ 44,666		$ 37,528
Gross Unrealized Gains	457		153
Gross Unrealized Losses	(7)		(21)
Fair Value	45,116	$ 37,700	37,660
Corporate Bonds [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	11,762		9,304
Gross Unrealized Gains	123		80
Fair Value	11,885		9,384
Municipal Fixed-Rate Bonds [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	2,854		930
Gross Unrealized Gains	30
Fair Value	2,884		930
Asset-Backed Bonds [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	6,634		6,867
Gross Unrealized Gains	74		26
Gross Unrealized Losses			(3)
Fair Value	6,708		6,890
Mortgage/Agency-Backed Bonds [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	11,536		6,944
Gross Unrealized Gains	114		26
Gross Unrealized Losses	(6)		(8)
Fair Value	11,644		6,962
U.S. Government Bonds [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	9,763		12,311
Gross Unrealized Gains	112		21
Gross Unrealized Losses			(9)
Fair Value	9,875		12,323
Foreign Government Bonds [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	1,334		372
Gross Unrealized Gains	4
Gross Unrealized Losses	(1)		(1)
Fair Value	1,337		371
Commercial Paper [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	250
Fair Value	250
Variable Rate Demand Notes [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost			800
Fair Value			$ 800
Other [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	533
Fair Value	$ 533

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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