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Investments with Continuous Unrealized Losses (Detail) - USD ($) $ in Thousands | Dec. 31, 2016 | Dec. 31, 2015
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Schedule of Available-for-sale Securities [Line Items] |  |
Investments with continuous unrealized losses for less than 12 months, Fair value | $ 2,184,292 | $ 2,473,260
Investments with continuous unrealized losses for less than 12 months, Unrealized losses | (15,554) | (10,352)
Investments with continuous unrealized losses for 12 months or greater, Fair value | 45,464 | 74,076
Investments with continuous unrealized losses for 12 months or greater, Unrealized losses | (31) | (387)
Total Investments with continuous unrealized losses, Fair value | 2,229,756 | 2,547,336
Total Investments with continuous unrealized losses, Unrealized losses | (15,585) | (10,739)
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 | 1,717,212 | 2,138,546
Investments with continuous unrealized losses for less than 12 months, Unrealized losses | (11,440) | (9,027)
Investments with continuous unrealized losses for 12 months or greater, Fair value | 40,465 | 68,084
Investments with continuous unrealized losses for 12 months or greater, Unrealized losses | (30) | (379)
Total Investments with continuous unrealized losses, Fair value | 1,757,677 | 2,206,630
Total Investments with continuous unrealized losses, Unrealized losses | (11,470) | (9,406)
Government Sponsored Enterprises Debentures |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Investments with continuous unrealized losses for less than 12 months, Fair value | 464,080 | 308,026
Investments with continuous unrealized losses for less than 12 months, Unrealized losses | (4,112) | (1,252)
Investments with continuous unrealized losses for 12 months or greater, Fair value | 4,999 | 5,992
Investments with continuous unrealized losses for 12 months or greater, Unrealized losses | (1) | (8)
Total Investments with continuous unrealized losses, Fair value | 469,079 | 314,018
Total Investments with continuous unrealized losses, Unrealized losses | (4,113) | (1,260)
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 | 3,000 | 26,688
Investments with continuous unrealized losses for less than 12 months, Unrealized losses | (2) | (73)
Total Investments with continuous unrealized losses, Fair value | 3,000 | 26,688
Total Investments with continuous unrealized losses, Unrealized losses | $ (2) | $ (73)

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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=73527792&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=73527792&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=73527792&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=73527792&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=73527792&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=73527792&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=73527792&loc=d3e27337-111563 + Details
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