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Income Taxes - Summary of Change in Valuation Allowance (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Income Tax Disclosure [Abstract] |  |  |
Beginning balance | $ 7,094 | $ 83,680 |
Charged to costs and expenses | (1,423) | (75,407) | $ 2,649
Charged to additional paid-in capital |  | (1,854) |
Charged to retained earnings |  | 1,010 |
Charged to other comprehensive income | 301 | (335) |
Ending balance | $ 5,972 | $ 7,094 | $ 83,680

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- Definition Valuation allowance deferred tax asset change in amount charged to additional paid in capital. + References No definition available. + Details
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- Definition Valuation allowance deferred tax asset change in amount charged to costs and expenses. + References No definition available. + Details
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- Definition Valuation allowance deferred tax asset change in amount charged to other comprehensive income. + References No definition available. + Details
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- Definition Valuation allowance deferred tax asset change in amount charged to retained earnings. + References No definition available. + Details
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- Definition Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32537-109319 + Details
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- References No definition available. + Details
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