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Schedule II - Valuation and Qualifying Accounts (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Valuation Allowance for Deferred Tax Assets [Member] |  |  |  |
Valuation And Qualifying Accounts Disclosure [Line Items] |  |  |  |
Valuation allowance, Beginning balance | [1] | $ 49,748 | $ 47,545 | $ 150,384
Valuation allowance, Additions/Charges to Expense | [1] | 2,146 | 4,219 | (109,805)
Valuation allowance, Deductions/ Other | [1] | (1,375) | (2,016) | 6,966
Valuation allowance, Ending balance | [1] | 50,519 | 49,748 | 47,545
Valuation Allowance for Accounts Receivable [Member] |  |  |  |
Valuation And Qualifying Accounts Disclosure [Line Items] |  |  |  |
Valuation allowance, Beginning balance |  | 23,142 | 20,229 | 19,097
Valuation allowance, Additions/Charges to Expense |  | 27,571 | 32,049 | 22,212
Valuation allowance, Deductions/ Other |  | (28,179) | (29,136) | (21,080)
Valuation allowance, Ending balance |  | $ 22,534 | $ 23,142 | $ 20,229
[1] | Amounts include both continuing and discontinued operations gross deferred tax balances.

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- Definition Valuation allowances and reserves deductions or other. + References No definition available. + Details
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- Definition Total of allowances and reserves, the valuation and qualifying accounts that are either netted against the cost of an asset (in order to value it at its carrying value) or that reflect a liability established to represent expected future costs. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -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 the allowances and reserves, which consist of the valuation and qualifying accounts that are either netted against the cost of an asset or that reflect a liability established to represent expected future costs, from charges to costs and expenses. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -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 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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