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Stockholders' Equity - Tax Effects Related to the Change in Each Component of Other Comprehensive Income (Loss) (Detail) - USD ($) $ in Thousands	3 Months Ended				6 Months Ended
	Jun. 30, 2020	Mar. 31, 2020	Jun. 30, 2019	Mar. 31, 2019	Jun. 30, 2020	Jun. 30, 2019
Equity [Abstract]
Unrealized gain (loss) on available-for-sale securities, Before-Tax Amount	$ 1,191		$ 243		$ (68)	$ 555
Unrealized gain (loss) on available-for-sale securities, Tax (Expense) Benefit	(310)		(63)		18	(144)
Unrealized gain (loss) on available-for-sale securities, Net-of-Tax Amount	881		180		(50)	411
Reclassification adjustment for amounts related to available-for-sale investments included in net income (loss), Before-Tax Amount	(686)		(99)		730	(161)
Reclassification adjustment for amounts related to available-for-sale investments included in net income (loss), Tax (Expense) Benefit	178		26		(190)	42
Reclassification adjustment for amounts related to available-for-sale investments included in net income (loss), Net-of-Tax Amount	(508)		(73)		540	(119)
Reclassification adjustment for amounts related to defined benefit plan adjustments included in net income (loss), Before-Tax Amount	277		217		481	393
Reclassification adjustment for amounts related to defined benefit plan adjustments included in net income (loss), Tax (Expense) Benefit	(86)		(67)		(149)	(122)
Reclassification adjustment for amounts related to defined benefit plan adjustments included in net income (loss), Net-of-Tax Amount	191		150		332	271
Foreign currency translation adjustment, Before-Tax Amount	1,899		533		249	(627)
Foreign currency translation adjustment, Net-of-Tax Amount	1,899		533		249	(627)
Total Other Comprehensive Income (Loss), Before-Tax Amount	2,681		894		1,392	160
Total Other Comprehensive Income (Loss), Tax (Expense) Benefit	(218)		(104)		(321)	(224)
Other Comprehensive Income (Loss), net of tax	$ 2,463	$ (1,392)	$ 790	$ (854)	$ 1,071	$ (64)

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