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Investments in Marketable Debt Securities, Available-for-Sale - Amortized Cost and Fair Value of Investments in Available for Sale Securities Unrealized Loss Position (Detail) - USD ($) $ in Thousands | Jun. 30, 2022 | Dec. 31, 2021
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Schedule of Available-for-sale Securities [Line Items] |  |
Available for sale securities continuous unrealized loss position for less than 12 months, fair value | $ 327,094 | $ 221,957
Available for sale securities continuous unrealized loss position for less than 12 months, gross unrealized loss | (4,535) | (503)
Available for sale securities continuous unrealized loss position for 12 months or longer, fair value | 688 | 146
Available for sale securities continuous unrealized loss position for 12 months or longer, gross unrealized loss | (96) | (8)
Available for sale securities continuous unrealized loss position, fair value | 327,782 | 222,103
Available for sale securities continuous unrealized loss position, gross unrealized loss | (4,631) | (511)
U.S. Treasuries [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available for sale securities continuous unrealized loss position for less than 12 months, fair value | 162,281 | 103,019
Available for sale securities continuous unrealized loss position for less than 12 months, gross unrealized loss | (1,852) | (297)
Available for sale securities continuous unrealized loss position for 12 months or longer, fair value | 0 | 0
Available for sale securities continuous unrealized loss position for 12 months or longer, gross unrealized loss | 0 | 0
Available for sale securities continuous unrealized loss position, fair value | 162,281 | 103,019
Available for sale securities continuous unrealized loss position, gross unrealized loss | (1,852) | (297)
U.S. Government Sponsored Entities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available for sale securities continuous unrealized loss position for less than 12 months, fair value | 506 | 115
Available for sale securities continuous unrealized loss position for less than 12 months, gross unrealized loss | (27) | (3)
Available for sale securities continuous unrealized loss position for 12 months or longer, fair value | 96 | 0
Available for sale securities continuous unrealized loss position for 12 months or longer, gross unrealized loss | (16) | 0
Available for sale securities continuous unrealized loss position, fair value | 602 | 115
Available for sale securities continuous unrealized loss position, gross unrealized loss | (43) | (3)
Corporate debt [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available for sale securities continuous unrealized loss position for less than 12 months, fair value | 157,965 | 115,908
Available for sale securities continuous unrealized loss position for less than 12 months, gross unrealized loss | (2,225) | (173)
Available for sale securities continuous unrealized loss position for 12 months or longer, fair value | 592 | 146
Available for sale securities continuous unrealized loss position for 12 months or longer, gross unrealized loss | (80) | (8)
Available for sale securities continuous unrealized loss position, fair value | 158,557 | 116,054
Available for sale securities continuous unrealized loss position, gross unrealized loss | (2,305) | (181)
ABS and other [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available for sale securities continuous unrealized loss position for less than 12 months, fair value | 6,342 | 2,915
Available for sale securities continuous unrealized loss position for less than 12 months, gross unrealized loss | (431) | (30)
Available for sale securities continuous unrealized loss position for 12 months or longer, fair value | 0 | 0
Available for sale securities continuous unrealized loss position for 12 months or longer, gross unrealized loss | 0 | 0
Available for sale securities continuous unrealized loss position, fair value | 6,342 | 2,915
Available for sale securities continuous unrealized loss position, gross unrealized loss | $ (431) | $ (30)

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- Definition Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in continuous unrealized loss position for more than 12 months, without allowance for credit loss. Includes beneficial interest in securitized financial asset. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 50 -Paragraph 5 -URI https://asc.fasb.org/extlink&oid=124269663&loc=SL82922890-210455 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI https://asc.fasb.org/extlink&oid=126970911&loc=d3e27337-111563 Reference 3: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 55 -Paragraph 8 -URI https://asc.fasb.org/extlink&oid=121590138&loc=SL82922954-210456 + Details
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- Definition Amount of accumulated unrealized loss on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in continuous unrealized loss position for 12 months or longer, without allowance for credit loss. Includes beneficial interest in securitized financial asset. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI https://asc.fasb.org/extlink&oid=126970911&loc=d3e27337-111563 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 50 -Paragraph 5 -URI https://asc.fasb.org/extlink&oid=124269663&loc=SL82922890-210455 + Details
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