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Net Operating Loss Carryforwards (Detail) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 USD ($)
U.S. Federal and state income tax |
Operating Loss Carryforwards [Line Items] |
Operating loss carryforward, amount | $ 61,302
U.S. Federal and state income tax | Minimum |
Operating Loss Carryforwards [Line Items] |
Operating loss carryforward, year of expiration | 2018
U.S. Federal and state income tax | Maximum |
Operating Loss Carryforwards [Line Items] |
Operating loss carryforward, year of expiration | 2036
Foreign |
Operating Loss Carryforwards [Line Items] |
Operating loss carryforward, amount | $ 12,499
Foreign | Minimum |
Operating Loss Carryforwards [Line Items] |
Operating loss carryforward, year of expiration | 2018
Foreign | Maximum |
Operating Loss Carryforwards [Line Items] |
Operating loss carryforward, year of expiration | 2037
Indefinite |
Operating Loss Carryforwards [Line Items] |
Operating loss carryforward, amount | $ 24,911
Operating loss carryforward, year of expiration | Indefinite

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- Definition Amount of operating loss carryforward, before tax effects, available to reduce future taxable income under enacted tax laws. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32559-109319 + Details
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