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Investments with Continuous Unrealized Losses (Detail) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
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Schedule of Available-for-sale Securities [Line Items] |  |
Investments with continuous unrealized losses for less than 12 months, Fair value | $ 1,911,338 | $ 2,184,292
Investments with continuous unrealized losses for less than 12 months, Unrealized losses | (8,636) | (15,554)
Investments with continuous unrealized losses for 12 months or greater, Fair value | 1,358,676 | 45,464
Investments with continuous unrealized losses for 12 months or greater, Unrealized losses | (13,266) | (31)
Total Investments with continuous unrealized losses, Fair Value | 3,270,014 | 2,229,756
Total Investments with continuous unrealized losses, Unrealized losses | (21,902) | (15,585)
Government And Corporate Debentures Fixed Interest Rate |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Investments with continuous unrealized losses for less than 12 months, Fair value | 1,647,125 | 1,717,212
Investments with continuous unrealized losses for less than 12 months, Unrealized losses | (7,318) | (11,440)
Investments with continuous unrealized losses for 12 months or greater, Fair value | 1,063,690 | 40,465
Investments with continuous unrealized losses for 12 months or greater, Unrealized losses | (9,585) | (30)
Total Investments with continuous unrealized losses, Fair Value | 2,710,815 | 1,757,677
Total Investments with continuous unrealized losses, Unrealized losses | (16,903) | (11,470)
Government Sponsored Enterprises Debentures |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Investments with continuous unrealized losses for less than 12 months, Fair value | 236,403 | 464,080
Investments with continuous unrealized losses for less than 12 months, Unrealized losses | (1,281) | (4,112)
Investments with continuous unrealized losses for 12 months or greater, Fair value | 294,986 | 4,999
Investments with continuous unrealized losses for 12 months or greater, Unrealized losses | (3,681) | (1)
Total Investments with continuous unrealized losses, Fair Value | 531,389 | 469,079
Total Investments with continuous unrealized losses, Unrealized losses | (4,962) | (4,113)
Government And Corporate Debentures Floating Interest Rate |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Investments with continuous unrealized losses for less than 12 months, Fair value | 27,810 | 3,000
Investments with continuous unrealized losses for less than 12 months, Unrealized losses | (37) | (2)
Total Investments with continuous unrealized losses, Fair Value | 27,810 | 3,000
Total Investments with continuous unrealized losses, Unrealized losses | $ (37) | $ (2)

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- Definition Amount of accumulated unrealized loss on investments in debt and equity securities classified as available-for-sale that have been in a continuous loss position for twelve months or longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27290-111563 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27337-111563 + Details
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- Definition Amount of accumulated unrealized loss on investments in debt and equity securities classified as available-for-sale in a continuous loss position. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27337-111563 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27290-111563 + Details
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- Definition This item represents the aggregate fair value of investments in debt and equity securities in an unrealized loss position which are categorized neither as held-to-maturity nor trading securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27290-111563 + Details
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- Definition Amount of accumulated unrealized loss on investments in debt and equity securities classified as available-for-sale that have been in a continuous loss position for less than twelve months. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27290-111563 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27337-111563 + Details
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