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Valuation and Qualifying Accounts (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Valuation Allowance for Deferred Tax Assets |  |  |  |  |  |
Valuation and Qualifying Accounts Disclosure [Line Items] |  |  |  |  |  |
Balance at beginning of period |  | $ 70,227 |  | $ 56,333 |  | $ 52,567
Charges to costs and expenses (income) |  | 9,037 |  | 13,894 |  | 3,766
Balance at end of period |  | 79,264 |  | 70,227 |  | 56,333
Allowance for Doubtful Accounts Receivable |  |  |  |  |  |
Valuation and Qualifying Accounts Disclosure [Line Items] |  |  |  |  |  |
Balance at beginning of period |  | $ 480,289 | [1] | 410,374 | [1] | 398,797
Charges to costs and expenses (income) |  |  |  | 869,077 | [1] | 741,578
Write-off of uncollectible accounts |  |  |  | (799,162) | [1] | (730,001)
Balance at end of period | [1] |  |  | $ 480,289 |  | $ 410,374
[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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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition Amount of valuation and qualifying accounts and reserves. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -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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- Definition Amount of decrease in valuation and qualifying accounts and reserves. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -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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