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Dividends Declared (Detail) - Dividend Declared - $ / shares | 1 Months Ended
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Dec. 31, 2017 | Nov. 30, 2017 | Oct. 31, 2017 | Sep. 30, 2017 | Aug. 31, 2017 | Jul. 31, 2017 | Jun. 30, 2017 | May 31, 2017 | Apr. 30, 2017 | Mar. 31, 2017 | Feb. 28, 2017 | Jan. 31, 2017
Dividends Payable [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Declaration Date |  |  |  | Jul. 14, 2017 | Jul. 14, 2017 | Jul. 14, 2017 | Apr. 12, 2017 | Apr. 12, 2017 | Apr. 12, 2017 | Jan. 12, 2017 | Jan. 12, 2017 | Jan. 12, 2017
Record Date |  |  |  | Sep. 29, 2017 | Aug. 31, 2017 | Jul. 31, 2017 | Jun. 30, 2017 | May 31, 2017 | Apr. 28, 2017 | Mar. 31, 2017 | Feb. 28, 2017 | Jan. 31, 2017
Payment Date |  |  |  | Oct. 13, 2017 | Sep. 15, 2017 | Aug. 15, 2017 | Jul. 17, 2017 | Jun. 15, 2017 | May 15, 2017 | Apr. 17, 2017 | Mar. 15, 2017 | Feb. 15, 2017
Dividend Declared Per Share |  |  |  | $ 0.06 | $ 0.06 | $ 0.06 | $ 0.06 | $ 0.06 | $ 0.06 | $ 0.06 | $ 0.06 | $ 0.06
Noncontrolling Interests |  |  |  |  |  |  |  |  |  |  |  |
Dividends Payable [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Declaration Date |  |  |  | Jul. 14, 2017 | Jul. 14, 2017 | Jul. 14, 2017 | Apr. 12, 2017 | Apr. 12, 2017 | Apr. 12, 2017 | Jan. 12, 2017 | Jan. 12, 2017 | Jan. 12, 2017
Record Date |  |  |  | Sep. 29, 2017 | Aug. 31, 2017 | Jul. 31, 2017 | Jun. 30, 2017 | May 31, 2017 | Apr. 28, 2017 | Mar. 31, 2017 | Feb. 28, 2017 | Jan. 31, 2017
Payment Date |  |  |  | Oct. 13, 2017 | Sep. 15, 2017 | Aug. 15, 2017 | Jul. 17, 2017 | Jun. 15, 2017 | May 15, 2017 | Apr. 17, 2017 | Mar. 15, 2017 | Feb. 15, 2017
Dividend Declared Per Share |  |  |  | $ 0.06 | $ 0.06 | $ 0.06 | $ 0.06 | $ 0.06 | $ 0.06 | $ 0.06 | $ 0.06 | $ 0.06
Scenario, Forecast |  |  |  |  |  |  |  |  |  |  |  |
Dividends Payable [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Declaration Date | Oct. 12, 2017 | Oct. 12, 2017 |  |  |  |  |  |  |  |  |  |
Record Date | Dec. 29, 2017 | Nov. 30, 2017 |  |  |  |  |  |  |  |  |  |
Payment Date | Jan. 15, 2018 | Dec. 15, 2017 |  |  |  |  |  |  |  |  |  |
Dividend Declared Per Share | $ 0.06 | $ 0.06 |  |  |  |  |  |  |  |  |  |
Scenario, Forecast | Noncontrolling Interests |  |  |  |  |  |  |  |  |  |  |  |
Dividends Payable [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Declaration Date | Oct. 12, 2017 | Oct. 12, 2017 |  |  |  |  |  |  |  |  |  |
Record Date | Dec. 29, 2017 | Nov. 30, 2017 |  |  |  |  |  |  |  |  |  |
Payment Date | Jan. 15, 2018 | Dec. 15, 2017 |  |  |  |  |  |  |  |  |  |
Dividend Declared Per Share | $ 0.06 | $ 0.06 |  |  |  |  |  |  |  |  |  |
Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |
Dividends Payable [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Declaration Date |  |  | Oct. 12, 2017 |  |  |  |  |  |  |  |  |
Record Date |  |  | Oct. 31, 2017 |  |  |  |  |  |  |  |  |
Payment Date |  |  | Nov. 15, 2017 |  |  |  |  |  |  |  |  |
Dividend Declared Per Share |  |  | $ 0.06 |  |  |  |  |  |  |  |  |
Subsequent Event | Noncontrolling Interests |  |  |  |  |  |  |  |  |  |  |  |
Dividends Payable [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Declaration Date |  |  | Oct. 12, 2017 |  |  |  |  |  |  |  |  |
Record Date |  |  | Oct. 31, 2017 |  |  |  |  |  |  |  |  |
Payment Date |  |  | Nov. 15, 2017 |  |  |  |  |  |  |  |  |
Dividend Declared Per Share |  |  | $ 0.06 |  |  |  |  |  |  |  |  |

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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 Date the declared dividend will be paid, in CCYY-MM-DD format. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=98513485&loc=d3e4304-108586 + Details
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- Definition Date the dividend to be paid was declared, in CCYY-MM-DD format. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=98513485&loc=d3e4304-108586 + Details
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- Definition Date the holder must own the stock to be entitled to the dividend, in CCYY-MM-DD format. + References No definition available. + 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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