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Valuation and Qualifying Accounts (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Valuation Allowance for Deferred Tax Assets |  |  |  |
Valuation and Qualifying Accounts Disclosure [Line Items] |  |  |  |
Balance at beginning of period |  | $ 79,264 | $ 70,227 | $ 56,333
Charges to costs and expenses (income) |  | (3,987) | 9,037 | 13,894
Balance at end of period |  | $ 75,277 | 79,264 | 70,227
Allowance for Doubtful Accounts Receivable |  |  |  |
Valuation and Qualifying Accounts Disclosure [Line Items] |  |  |  |
Balance at beginning of period | [1] |  | $ 480,289 | 410,374
Charges to costs and expenses (income) | [1] |  |  | 869,077
Write-off of uncollectible accounts | [1] |  |  | (799,162)
Balance at end of period | [1] |  |  | $ 480,289
[1] | Effective January 1, 2018, the Company adopted ASC 606 using a modified retrospective approach. This schedule discloses allowance for doubtful accounts receivable for periods reported under ASC 605 only.

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