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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, 2019	Mar. 31, 2019	Jun. 30, 2018	Mar. 31, 2018	Jun. 30, 2019	Jun. 30, 2018
Equity [Abstract]
Unrealized gains (losses) on available-for-sale securities, Before-Tax Amount	$ 243		$ (111)		$ 555	$ (458)
Unrealized gains (losses) on available-for-sale securities, Tax (Expense) Benefit	(63)		29		(144)	119
Unrealized gains (losses) on available-for-sale securities, Net-of-Tax Amount	180		(82)		411	(339)
Reclassification adjustment for amounts related to available-for-sale investments included in net income (loss), Before-Tax Amount	(99)		251		(161)	324
Reclassification adjustment for amounts related to available-for-sale investments included in net income (loss), Tax (Expense) Benefit	26		(65)		42	(73)
Reclassification adjustment for amounts related to available-for-sale investments included in net income (loss), Net-of-Tax Amount	(73)		186		(119)	251
Reclassification adjustment for amounts reclassed to retained earnings related of the adoption of ASU 2016-01, Before-Tax Amount						(3,220)
Reclassification adjustment for amounts reclassed to retained earnings related of the adoption of ASU 2016-01, Net-of-Tax Amount						(3,220)
Reclassification adjustment for amounts related to defined benefit plan adjustments included in net income (loss), Before-Tax Amount	217		7		393	97
Reclassification adjustment for amounts related to defined benefit plan adjustments included in net income (loss), Tax (Expense) Benefit	(67)		(2)		(122)	(30)
Reclassification adjustment for amounts related to defined benefit plan adjustments included in net income (loss), Net-of-Tax Amount	150		5		271	67
Foreign currency translation adjustment, Before-Tax Amount	533		(3,424)		(627)	(2,582)
Foreign currency translation adjustment, Net-of-Tax Amount	533		(3,424)		(627)	(2,582)
Total Other Comprehensive Income (Loss), Before-Tax Amount	894		(3,277)		160	(5,839)
Total Other Comprehensive Income (Loss), Tax (Expense) Benefit	(104)		(38)		(224)	16
Other Comprehensive Income (Loss), net of tax	$ 790	$ (854)	$ (3,315)	$ (2,508)	$ (64)	$ (5,823)

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