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Nature of Business and Summary of Significant Accounting Policies (Other Comprehensive Income) - Tax Effects Related to the Change in Each Component of Other Comprehensive Income (Loss) (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Equity [Abstract]
Unrealized gains (losses) on available-for-sale securities, Before-Tax Amount	$ 926	$ 8,230	$ 2,484
Unrealized gains (losses) on available-for-sale securities, Tax (Expense) Benefit	(241)	(3,210)	(969)
Unrealized gains (losses) on available-for-sale securities, Net-of-Tax Amount	685	5,020	1,515
Reclassification adjustment for amounts related to available-for-sale investments included in net income (loss), Before-Tax Amount	(804)	(4,684)	(4,989)
Reclassification adjustment for amounts related to available-for-sale investments included in net income (loss), Tax (Expense) Benefit	209	1,827	1,946
Reclassification adjustment for amounts related to available-for-sale investments included in net income (loss), Net-of-Tax Amount	(595)	(2,857)	(3,043)
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)
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	(5,638)	654	(1,782)
Defined benefit plan adjustments, Tax (Expense) Benefit	1,748	(203)	553
Defined benefit plan adjustments, Net-of-Tax Amount	(3,890)	451	(1,229)
Reclassification adjustment for amounts related to defined benefit plan adjustments included in net income, Before-Tax Amount	196	406	156
Reclassification adjustment for amounts related to defined benefit plan adjustments included in net income, Tax (Expense) Benefit	(61)	(126)	(49)
Reclassification adjustment for amounts related to defined benefit plan adjustments included in net income, Net-of-Tax Amount	135	280	107
Foreign currency translation adjustment, Before-Tax Amount	(4,236)	5,999	(569)
Foreign currency translation adjustment, Net-of-Tax Amount	(4,236)	5,999	(569)
Total Other Comprehensive Income (Loss), Before-Tax Amount	(13,907)	10,605	(4,700)
Total Other Comprehensive Income (Loss), Tax (Expense) Benefit	2,786	(1,712)	1,481
Other Comprehensive Income (Loss), net of tax	$ (11,121)	$ 8,893	$ (3,219)

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