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Schedule II- Valuation and Qualifying Accounts (Detail) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Allowance for Doubtful Accounts |  |  |
Valuation and Qualifying Accounts Disclosure [Line Items] |  |  |
Beginning balance | $ 39,317 | $ 32,694 | $ 30,600
Provisions for Doubtful Accounts | 64,375 | 21,898 | 6,527
Write-offs, Net of Recoveries | (3,363) | (15,275) | (4,433)
Ending balance | 100,329 | 39,317 | 32,694
Valuation Allowance of Deferred Tax Assets |  |  |
Valuation and Qualifying Accounts Disclosure [Line Items] |  |  |
Beginning balance | 2,759,431 | 2,643,899 | 3,390,467
Provisions for Doubtful Accounts | 264,366 | 147,881 | 201,282
Write-offs, Net of Recoveries | (37,113) | (32,349) | (947,850)
Ending balance | $ 2,986,684 | $ 2,759,431 | $ 2,643,899

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- Definition Amount of increase (decrease) in valuation and qualifying accounts and reserves from adjustment. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 4 -Subparagraph (SX 210.12-09) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e24092-122690 + Details
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