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Declared Common Stock Dividends (Parenthetical) (Detail) - $ / shares | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Dividends Payable [Line Items] |  |  |
Dividend declared per share | $ 1.68 | $ 2.04 | $ 2.16
Qualified dividend as defined by the IRS |  |  |
Dividends Payable [Line Items] |  |  |
Dividend declared per share | 0.051202 |  |
Qualified dividend as defined by the IRS |  |  |
Dividends Payable [Line Items] |  |  |
Dividend declared per share | 0.030979 |  |
Qualified dividend as defined by the IRS |  |  |
Dividends Payable [Line Items] |  |  |
Dividend declared per share | $ 0.000000 |  |

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- Definition Aggregate dividends declared during the period for each share of common stock outstanding. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 + 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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