Declared Common Stock Dividends (Detail) - $ / shares	3 Months Ended
Mar. 31, 2018	Mar. 31, 2017
Dividends Payable [Line Items]
Per Share	$ 0.43	$ 0.42
Dividend Payment 1st
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 2nd
Dividends Payable [Line Items]
Declaration Date	May 11, 2017
Record Date	Jul. 03, 2017
Payable Date	Jul. 17, 2017
Per Share	$ 0.42
Dividend Payment 3rd
Dividends Payable [Line Items]
Declaration Date	Aug. 10, 2017
Record Date	Oct. 02, 2017
Payable Date	Oct. 16, 2017
Per Share	$ 0.42
Dividend Payment 4th
Dividends Payable [Line Items]
Declaration Date	Dec. 07, 2017
Record Date	Jan. 02, 2018
Payable Date	Jan. 15, 2018
Per Share	$ 0.42
Dividend Payment 5th
Dividends Payable [Line Items]
Declaration Date	Feb. 22, 2018
Record Date	Apr. 02, 2018
Payable Date	Apr. 16, 2018
Per Share	$ 0.43

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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+ 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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