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Dividends - Additional Information (Detail) - Subsequent Event [Member]	Nov. 08, 2018 $ / shares
Dividends Payable [Line Items]
Quarterly dividend payment per share	$ 0.285
Cash dividend anticipated payable date	2019-04
First Installment [Member]
Dividends Payable [Line Items]
Dividends payable date declared	Nov. 08, 2018
Quarterly dividend payment per share	$ 0.25
Record Date	Dec. 31, 2018
Cash dividend payable date	Jan. 18, 2019

X

- Definition

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

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-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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- Definition

The per share amount of a dividend declared, but not paid, as of the financial reporting date.

+ References

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-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.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 50
-Paragraph 3
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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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Date the declared dividend will be paid, in CCYY-MM format.

+ References

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-Topic 230
-SubTopic 10
-Section 50
-Paragraph 3
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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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