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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 9 Months Ended
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Sep. 30, 2019
Sep. 30, 2018
Equity [Abstract]                
Unrealized gain (loss) on available-for-sale securities, Before-Tax Amount $ (53)     $ 1,632     $ 503 $ 1,174
Unrealized gain (loss) on available-for-sale securities, Tax (Expense) Benefit 14     (424)     (131) (305)
Unrealized gain (loss) on available-for-sale securities, Net-of-Tax Amount (39)     1,208     372 869
Reclassification adjustment for amounts related to available-for-sale investments included in net income (loss), Before-Tax Amount 32     (1,676)     (128) (1,352)
Reclassification adjustment for amounts related to available-for-sale investments included in net income (loss), Tax (Expense) Benefit (8)     436     33 363
Reclassification adjustment for amounts related to available-for-sale investments included in net income (loss), Net-of-Tax Amount 24     (1,240)     (95) (989)
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 130     54     523 151
Reclassification adjustment for amounts related to defined benefit plan adjustments included in net income (loss), Tax (Expense) Benefit (40)     (17)     (162) (47)
Reclassification adjustment for amounts related to defined benefit plan adjustments included in net income (loss), Net-of-Tax Amount 90     37     361 104
Foreign currency translation adjustment, Before-Tax Amount (2,486)     (451)     (3,113) (3,033)
Foreign currency translation adjustment, Net-of-Tax Amount (2,486)     (451)     (3,113) (3,033)
Total Other Comprehensive Income (Loss), Before-Tax Amount (2,377)     (441)     (2,215) (6,280)
Total Other Comprehensive Income (Loss), Tax (Expense) Benefit (34)     (5)     (260) 11
Other Comprehensive Loss, net of tax $ (2,411) $ 790 $ (854) $ (446) $ (3,315) $ (2,508) $ (2,475) $ (6,269)