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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Declared Common Stock Dividends (Detail) - $ / shares	3 Months Ended		6 Months Ended
Declared Common Stock Dividends (Detail) - $ / shares	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Dividends Payable [Line Items]
Per Share	$ 0.42	$ 0.54	$ 0.84	$ 1.08
Dividend Payment 1st
Dividends Payable [Line Items]
Declaration Date			Feb. 19, 2016
Record Date			Apr. 01, 2016
Payable Date			Apr. 15, 2016
Per Share			$ 0.54
Dividend Payment 2nd
Dividends Payable [Line Items]
Declaration Date			May 12, 2016
Record Date			Jul. 01, 2016
Payable Date			Jul. 15, 2016
Per Share			$ 0.54
Dividend Payment 3rd
Dividends Payable [Line Items]
Declaration Date			Aug. 11, 2016
Record Date			Oct. 03, 2016
Payable Date			Oct. 17, 2016
Per Share			$ 0.54
Dividend Payment 4th
Dividends Payable [Line Items]
Declaration Date			Dec. 08, 2016
Record Date			Jan. 03, 2017
Payable Date			Jan. 13, 2017
Per Share			$ 0.42
Dividend Payment 5th
Dividends Payable [Line Items]
Declaration Date			Feb. 17, 2017
Record Date			Apr. 03, 2017
Payable Date			Apr. 17, 2017
Per Share			$ 0.42
Dividend Payment 6th
Dividends Payable [Line Items]
Declaration Date			May 11, 2017
Record Date			Jul. 03, 2017
Payable Date			Jul. 17, 2017
Per Share			$ 0.42