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Schedule II - Valuation and Qualifying Accounts (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Allowance for doubtful accounts and unbilled services |  |  |
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward] |  |  |
Balance at Beginning of period | $ 180,687 | $ 178,819 | $ 185,754
Charged to Expense | 17,872 | 15,386 | 8,912
Charged to Other Accounts | 25,300 | 9,656 | 9,501
Deductions | 21,465 | 23,174 | 25,348
Balance at End of Period | 202,394 | 180,687 | 178,819
Valuation allowance for deferred tax asset |  |  |
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward] |  |  |
Balance at Beginning of period | 21,621 | 18,900 | 13,167
Charged to Expense | 308 | 2,721 | 5,733
Charged to Other Accounts | 0 | 0 | 0
Deductions | 0 | 0 | 0
Balance at End of Period | $ 21,929 | $ 21,621 | $ 18,900

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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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