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Recent Accounting Standards - Additional Information (Detail) - USD ($) | Jun. 30, 2020 | Jan. 01, 2020 | Dec. 31, 2019
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New Accounting Pronouncements Or Change In Accounting Principle [Line Items] |  |  |
Cumulative-effect adjustment to retained earnings | $ 587,533,000 |  | $ 583,489,000
Minimum | US Treasury Securities |  |  |
New Accounting Pronouncements Or Change In Accounting Principle [Line Items] |  |  |
Available-for-sale securities maturity range | 3 months |  |
Maximum | US Treasury Securities |  |  |
New Accounting Pronouncements Or Change In Accounting Principle [Line Items] |  |  |
Available-for-sale securities maturity range | 1 year |  |
ASU 2016-13 | Revision Of Prior Period Change In Accounting Principle Adjustment |  |  |
New Accounting Pronouncements Or Change In Accounting Principle [Line Items] |  |  |
Cumulative-effect adjustment to retained earnings |  | $ 0 |
ASU 2018-15 |  |  |
New Accounting Pronouncements Or Change In Accounting Principle [Line Items] |  |  |
Material capitalized implementation costs | $ 0 |  |

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- Definition Period between issuance and maturity of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bbb)(2) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 + Details
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