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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, 2019	Dec. 31, 2018	Dec. 31, 2017
Equity [Abstract]
Unrealized gain (loss) on available-for-sale securities, Before-Tax Amount	$ 774	$ 926	$ 8,230
Unrealized gain (loss) on available-for-sale securities, Tax (Expense) Benefit	(201)	(241)	(3,210)
Unrealized gain (loss) on available-for-sale securities, Net-of-Tax Amount	573	685	5,020
Reclassification adjustment for amounts related to available-for-sale investments included in net income (loss), Before-Tax Amount	(397)	(804)	(4,684)
Reclassification adjustment for amounts related to available-for-sale investments included in net income (loss), Tax (Expense) Benefit	103	209	1,827
Reclassification adjustment for amounts related to available-for-sale investments included in net income (loss), Net-of-Tax Amount	(294)	(595)	(2,857)
Reclassification adjustment for amounts reclassed to retained earnings related of the adoption of ASU 2018-02/2016-01, Before-Tax Amount		(4,351)
Reclassification adjustment for amounts reclassed to retained earnings related of the adoption of ASU 2018-02/2016-01, Tax (Expense) Benefit		1,131
Reclassification adjustment for amounts reclassed to retained earnings related of the adoption of ASU 2018-02/2016-01, Net-of-Tax Amount		(3,220)
Unrealized gains (losses) on cash flow hedges, Before-Tax Amount			(897)
Unrealized gains (losses) on cash flow hedges, Tax (Expense) Benefit			278
Unrealized gains (losses) on cash flow hedges, Net-of-Tax Amount			(619)
Reclassification adjustment for amounts related to cash flow hedges included in net income, Before-Tax Amount			897
Reclassification adjustment for amounts related to cash flow hedges included in net income, Tax (Expense) Benefit			(278)
Reclassification adjustment for amounts related to cash flow hedges included in net income, Net-of-Tax Amount			619
Defined benefit plan adjustments, Before-Tax Amount	(2,488)	(5,638)	654
Defined benefit plan adjustments, Tax (Expense) Benefit	771	1,748	(203)
Defined benefit plan adjustments, Net-of-Tax Amount	(1,717)	(3,890)	451
Reclassification adjustment for amounts related to defined benefit plan adjustments included in net income (loss), Before-Tax Amount	771	196	406
Reclassification adjustment for amounts related to defined benefit plan adjustments included in net income (loss), Tax (Expense) Benefit	(239)	(61)	(126)
Reclassification adjustment for amounts related to defined benefit plan adjustments included in net income (loss), Net-of-Tax Amount	532	135	280
Foreign currency translation adjustment, Before-Tax Amount	(1,480)	(4,236)	5,999
Foreign currency translation adjustment, Net-of-Tax Amount	(1,480)	(4,236)	5,999
Total Other Comprehensive Income (Loss), Before-Tax Amount	(2,820)	(13,907)	10,605
Total Other Comprehensive Income (Loss), Tax (Expense) Benefit	434	2,786	(1,712)
Other Comprehensive Income (Loss), net of tax	$ (2,386)	$ (11,121)	$ 8,893

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