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Valuation Allowance of Deferred Tax Assets (Detail) - Valuation Allowance of Deferred Tax Assets - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Valuation and Qualifying Accounts Disclosure [Line Items] |  |  |  |
Beginning Balance | $ 35,246 |  | $ 14,524 | $ 50,636
Additions | 22,005 | [1] | 21,347 | 483
Deductions | (2,526) |  | (625) | (36,595)
Ending Balance | $ 54,725 |  | $ 35,246 | $ 14,524
[1] | A valuation allowance was provided against certain deferred tax assets arising from carryforwards of unused foreign tax credit benefits.

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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 decrease in 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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