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Nature of Business - Tax Effects Related to the Change in Each Component of Other Comprehensive Income (Loss) (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Equity [Abstract]      
Unrealized gain (loss) on available-for-sale securities, Before-Tax Amount $ 1,012 $ 774 $ 926
Unrealized gain (loss) on available-for-sale securities, Tax (Expense) Benefit (263) (201) (241)
Unrealized gain (loss) on available-for-sale securities, Net-of-Tax Amount 749 573 685
Reclassification adjustment for amounts related to available-for-sale investments included in net income (loss), Before-Tax Amount (585) (397) (804)
Reclassification adjustment for amounts related to available-for-sale investments included in net income (loss), Tax (Expense) Benefit 152 103 209
Reclassification adjustment for amounts related to available-for-sale investments included in net income (loss), Net-of-Tax Amount (433) (294) (595)
Reclassification adjustment for amounts reclassed to retained earnings related of the adoption of ASU 2016-01, Before-Tax Amount     (4,351)
Reclassification adjustment for amounts reclassed to retained earnings related of the adoption of ASU 2016-01, Tax (Expense) Benefit     1,131
Reclassification adjustment for amounts reclassed to retained earnings related of the adoption of ASU 2016-01, Net-of-Tax Amount     (3,220)
Defined benefit plan adjustments, Before-Tax Amount (1,784) (2,488) (5,638)
Defined benefit plan adjustments, Tax (Expense) Benefit 553 771 1,748
Defined benefit plan adjustments, Net-of-Tax Amount (1,231) (1,717) (3,890)
Reclassification adjustment for amounts related to defined benefit plan adjustments included in net income (loss), Before-Tax Amount 1,212 771 196
Reclassification adjustment for amounts related to defined benefit plan adjustments included in net income (loss), Tax (Expense) Benefit (376) (239) (61)
Reclassification adjustment for amounts related to defined benefit plan adjustments included in net income (loss), Net-of-Tax Amount 836 532 135
Foreign currency translation adjustment, Before-Tax Amount 4,857 (1,480) (4,236)
Foreign currency translation adjustment, Net-of-Tax Amount 4,857 (1,480) (4,236)
Total Other Comprehensive Income (Loss), Before-Tax Amount 4,712 (2,820) (13,907)
Total Other Comprehensive Income (Loss), Tax (Expense) Benefit 66 434 2,786
Other Comprehensive Income (Loss), net of tax $ 4,778 $ (2,386) $ (11,121)