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Accumulated Other Comprehensive Income (Loss) (Other Comprehensive Income (Loss) Reclassification Adjustments) (Detail) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2021 | Jun. 30, 2021 | Mar. 31, 2021 | Sep. 30, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Accumulated Other Comprehensive Income Loss [Line Items] |  |  |  |  |  |  |  |
Pretax change before reclassifications | $ (62,918) |  |  | $ 19,927 |  |  | $ (124,823) | $ 92,894
Reclassifications out of AOCI | (5,561) |  |  | (6,083) |  |  | (13,725) | (3,545)
Tax effect | 14,148 |  |  | (1,387) |  |  | 32,865 | (24,044)
Total other comprehensive (loss) income, net of tax | (54,331) | $ 44,018 | $ (95,370) | 12,457 | $ 73,301 | $ (20,453) | (105,683) | 65,305
Unrealized Gains (Losses) on Securities |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Income Loss [Line Items] |  |  |  |  |  |  |  |
Pretax change before reclassifications | (49,970) |  |  | 9,110 |  |  | (120,979) | 102,392
Reclassifications out of AOCI | (6,925) |  |  | (6,627) |  |  | (17,817) | (5,175)
Tax effect | 14,181 |  |  | (499) |  |  | 33,942 | (24,000)
Total other comprehensive (loss) income, net of tax | (42,714) |  |  | 1,984 |  |  | (104,854) | 73,217
Foreign Currency Translation Adjustment |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Income Loss [Line Items] |  |  |  |  |  |  |  |
Pretax change before reclassifications | (12,948) |  |  | 10,817 |  |  | (3,844) | (9,498)
Reclassifications out of AOCI | 0 |  |  | 0 |  |  | 0 | 0
Tax effect | 329 |  |  | (743) |  |  | 9 | 389
Total other comprehensive (loss) income, net of tax | (12,619) |  |  | 10,074 |  |  | (3,835) | (9,109)
Pension Benefit Adjustment |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Income Loss [Line Items] |  |  |  |  |  |  |  |
Pretax change before reclassifications | 0 |  |  | 0 |  |  | 0 | 0
Reclassifications out of AOCI | 1,364 |  |  | 544 |  |  | 4,092 | 1,630
Tax effect | (362) |  |  | (145) |  |  | (1,086) | (433)
Total other comprehensive (loss) income, net of tax | $ 1,002 |  |  | $ 399 |  |  | $ 3,006 | $ 1,197

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- Definition Amount before tax and reclassification adjustments of other comprehensive income (loss). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=124431353&loc=SL124442411-227067 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 30 -Section 45 -Paragraph 20 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=118261656&loc=d3e32211-110900 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 30 -Section 45 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=118261656&loc=d3e32136-110900 Reference 4: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=124431353&loc=SL124442407-227067 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 30 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6450520&loc=d3e32583-110901 Reference 6: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=124509347&loc=SL7669686-108580 + Details
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