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Stockholders' Equity - Tax Effects Related to the Change in Each Component of Other Comprehensive Loss (Detail) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Equity [Abstract]    
Unrealized gain (loss) on available-for-sale securities, Before-Tax Amount $ (1,258) $ 312
Unrealized gain (loss) on available-for-sale securities, Tax (Expense) Benefit 327 (81)
Unrealized gain (loss) on available-for-sale securities, Net-of-Tax Amount (931) 231
Reclassification adjustment for amounts related to available-for-sale investments included in net income (loss), Before-Tax Amount 1,416 (62)
Reclassification adjustment for amounts related to available-for-sale investments included in net income (loss), Tax (Expense) Benefit (368) 16
Reclassification adjustment for amounts related to available-for-sale investments included in net income (loss), Net-of-Tax Amount 1,048 (46)
Reclassification adjustment for amounts related to defined benefit plan adjustments included in net income (loss), Before-Tax Amount 204 175
Reclassification adjustment for amounts related to defined benefit plan adjustments included in net income (loss), Tax (Expense) Benefit (63) (54)
Reclassification adjustment for amounts related to defined benefit plan adjustments included in net income (loss), Net-of-Tax Amount 141 121
Foreign currency translation adjustment, Before-Tax Amount (1,650) (1,160)
Foreign currency translation adjustment, Net-of-Tax Amount (1,650) (1,160)
Total Other Comprehensive Income (Loss), Before-Tax Amount (1,288) (735)
Total Other Comprehensive Income (Loss), Tax (Expense) Benefit (104) (119)
Other Comprehensive Loss, net of tax $ (1,392) $ (854)