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Effective Income Tax Reconciliation (Parenthetical) (Detail) - $ / shares | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Income Tax Disclosure [Abstract] |  |  |
Basic earnings per share amounts of the benefit resulting from the "Technological preferred or Preferred Enterprise" status | $ 0.68 | $ 0.26 | $ 0.31
Diluted earnings per share amounts of the benefit resulting from the "Technological preferred or Preferred Enterprise" status | $ 0.66 | $ 0.26 | $ 0.30

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- Definition Basic Earnings Per Shares Amount Resulting From Issuance Of Status + References No definition available. + Details
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- Definition Diluted Earnings Per Shares Amount Resulting From Issuance Of Status + References No definition available. + Details
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Data Type: | num:perShareItemType
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- References No definition available. + Details
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