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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
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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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- Definition Amount of tax expense (benefit), before reclassification adjustments, related to increase (decrease) in accumulated gain (loss) from derivative instruments designated and qualifying as the effective portion of cash flow hedges and an entity's share of an equity investee's increase (decrease) in deferred hedging gain (loss). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=114867106&loc=d3e640-108580 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 10A -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=114867106&loc=SL7669646-108580 + Details
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- Definition Amount before tax and reclassification adjustments of unrealized holding gain (loss) on available-for-sale securities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=114867106&loc=d3e637-108580 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27357-111563 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 10A -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=114867106&loc=SL7669646-108580 + Details
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- Definition Amount after tax, before reclassification adjustments, of unrealized holding gain (loss) on available-for-sale securities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 10A -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=114867106&loc=SL7669646-108580 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=114867106&loc=d3e637-108580 + Details
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- Definition Amount of tax expense (benefit) before reclassification adjustments of unrealized holding gain (loss) on available-for-sale securities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=114867106&loc=d3e640-108580 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 10A -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=114867106&loc=SL7669646-108580 + Details
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