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Schedule II - Valuation and Qualifying Accounts (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Movement in Valuation Allowances And Reserves [Roll Forward] |  |  |
Balance at Beginning of Period | $ 90,775 | $ 92,571 | $ 97,920
Provision for Doubtful Accounts | 39,270 | 39,762 | 20,603
Write-offs, Net of Recoveries | (35,484) | (41,558) | (25,952)
Balance at End of Period | 94,561 | 90,775 | 92,571
Deferred income tax valuation allowance [Member] |  |  |
Movement in Valuation Allowances And Reserves [Roll Forward] |  |  |
Balance at Beginning of Period | 2,477,703 | 2,513,738 | 2,583,274
Increase | 96,353 | 0 | 0
Decrease | 0 | (36,035) | (69,536)
Balance at End of Period | $ 2,574,056 | $ 2,477,703 | $ 2,513,738

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- Definition Allowance for doubtful accounts receivable write offs net of recoveries. + References No definition available. + Details
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- Definition Amount of allowance for credit loss on accounts receivable, classified as current. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(4) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=118936363&loc=d3e5074-111524 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=118955202&loc=SL82895884-210446 + Details
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- Definition Amount of expense (reversal of expense) for expected credit loss on accounts receivable. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 13 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=119407570&loc=SL82919249-210447 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03(5)) -URI http://asc.fasb.org/extlink&oid=116634182&loc=SL114868664-224227 + Details
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