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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
Valuation Allowance for Deferred Tax Assets [Member] |  |  |  |
Valuation And Qualifying Accounts Disclosure [Line Items] |  |  |  |
Valuation allowance, Beginning balance | [1] | $ 50,519 | $ 49,748 | $ 47,545
Valuation allowance, Additions/Charges to Expense | [1] |  | 2,146 | 4,219
Valuation allowance, Deductions/ Other | [1] | (2,482) | (1,375) | (2,016)
Valuation allowance, Ending balance | [1] | 48,037 | 50,519 | 49,748
Valuation Allowance for Accounts Receivable [Member] |  |  |  |
Valuation And Qualifying Accounts Disclosure [Line Items] |  |  |  |
Valuation allowance, Beginning balance |  | 22,534 | 23,142 | 20,229
Valuation allowance, Additions/Charges to Expense |  | 32,042 | 27,571 | 32,049
Valuation allowance, Deductions/ Other |  | (29,740) | (28,179) | (29,136)
Valuation allowance, Ending balance |  | $ 24,836 | $ 22,534 | $ 23,142
[1] | Amounts include both continuing and discontinued operations gross deferred tax balances.

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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 increase in valuation and qualifying accounts and reserves from charge to cost and expense. + 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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