Aggregate dividends declared during the period for each share of common stock outstanding.

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

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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

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Date the dividend to be paid was declared, in CCYY-MM-DD format.

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Date the holder must own the stock to be entitled to the dividend, in CCYY-MM-DD format.

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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.

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Cash Dividends Declared (Detail) - $ / shares	3 Months Ended		9 Months Ended
Cash Dividends Declared (Detail) - $ / shares	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Dividends Payable [Line Items]
Dividend per share	$ 0.0425	$ 0.0425	$ 0.1275	$ 0.1275
Dividend Payment 1st
Dividends Payable [Line Items]
Dividend per share			$ 0.0425
Date declared			Mar. 08, 2017
Date of record			May 01, 2017
Payment date			May 15, 2017
Dividend Payment 2nd
Dividends Payable [Line Items]
Dividend per share			$ 0.0425
Date declared			Jun. 22, 2017
Date of record			Aug. 01, 2017
Payment date			Aug. 15, 2017
Dividend Payment 3rd
Dividends Payable [Line Items]
Dividend per share			$ 0.0425
Date declared			Aug. 04, 2017
Date of record			Nov. 01, 2017
Payment date			Nov. 15, 2017