Stockholders' Equity - Tax Effects Related to the Change in Each Component of Other Comprehensive Loss (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Equity [Abstract]
Unrealized loss on available-for-sale securities, Before-Tax Amount	$ (75)	$ (1,258)
Unrealized loss on available-for-sale securities, Tax (Expense) Benefit	18	327
Unrealized loss on available-for-sale securities, Net-of-Tax Amount	(57)	(931)
Reclassification adjustment for amounts related to available-for-sale investments included in net income (loss), Before-Tax Amount	(178)	1,416
Reclassification adjustment for amounts related to available-for-sale investments included in net income (loss), Tax (Expense) Benefit	43	(368)
Reclassification adjustment for amounts related to available-for-sale investments included in net income (loss), Net-of-Tax Amount	(135)	1,048
Reclassification adjustment for amounts related to defined benefit plan adjustments included in net income (loss), Before-Tax Amount	143	204
Reclassification adjustment for amounts related to defined benefit plan adjustments included in net income (loss), Tax (Expense) Benefit	(44)	(63)
Reclassification adjustment for amounts related to defined benefit plan adjustments included in net income (loss), Net-of-Tax Amount	99	141
Foreign currency translation adjustment, Before-Tax Amount	(1,863)	(1,650)
Foreign currency translation adjustment, Net-of-Tax Amount	(1,863)	(1,650)
Total Other Comprehensive Income (Loss), Before-Tax Amount	(1,973)	(1,288)
Total Other Comprehensive Income (Loss), Tax (Expense) Benefit	17	(104)
Other Comprehensive Loss, net of tax	$ (1,956)	$ (1,392)