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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
Allowance for Doubtful Accounts |  |  |  |
Valuation and Qualifying Accounts Disclosure [Line Items] |  |  |  |
Balance at the beginning of the period |  | $ 4,190 | $ 3,181 | $ 3,825
Additions | [1] | 1,912 | 2,269 | 224
Deduction |  | (613) | (1,260) | (868)
Balance at the end of the period |  | 5,489 | 4,190 | 3,181
Valuation Allowance of Deferred Tax Assets |  |  |  |
Valuation and Qualifying Accounts Disclosure [Line Items] |  |  |  |
Balance at the beginning of the period |  | 1,015 | 832 | 1,984
Additions | [1] | 492 | 183 | 20
Deduction |  | 0 | 0 | (1,172)
Balance at the end of the period |  | $ 1,507 | $ 1,015 | $ 832
[1] | Reductions in/charges to revenues and expenses.

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- Definition Amount of increase (decrease) in valuation and qualifying accounts and reserves from adjustment. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -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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