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v3.20.4

Fair Value Measurements - Additional Information (Detail) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Fair Value Disclosures [Abstract] |  |  |
Transfers of assets from level 1 to 2 | $ 0 | $ 29,800,000 | $ 0
Transfers of assets from level 2 to 1 | 0 |  | 0
Transfers of assets into level 3 | 0 |  | 0
Transfers of assets out of level 3 | 0 |  | 0
Transfers of liabilities from level 1 to 2 | 0 | 0 | 0
Transfers of liabilities from level 2 to 1 | 0 | 0 | 0
Transfers of liabilities into level 3 | 0 | 0 | 0
Transfers of liabilities out of level 3 | $ 0 | $ 0 | $ 0

X
- Definition Amount of transfers of assets measured on a recurring basis out of Level 1 of the fair value hierarchy into Level 2. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bb) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 + Details
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