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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 |  |  |
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward] |  |  |
Balance at beginning of period | $ 12,342 | $ 7,340 | $ 5,614
Charged/ (credited) to expense | 9,458 | 2,632 | 3,635
Charged/(credited) to other accounts | (360) | 4,979 | 0
Deductions from reserves | 4,513 | 2,609 | 1,909
Balance at end of period | 16,927 | 12,342 | 7,340
Valuation allowance-taxes |  |  |
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward] |  |  |
Balance at beginning of period | 25,683 | 21,418 | 12,623
Charged/ (credited) to expense | 27,410 | 4,265 | 3,405
Charged/(credited) to other accounts | 0 | 0 | 5,390
Deductions from reserves | 11,314 | 0 | 0
Balance at end of period | $ 41,779 | $ 25,683 | $ 21,418

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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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