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Stockholders' Equity - Summary of Dividends Declared and Paid (Detail) - $ / shares				3 Months Ended		9 Months Ended
	May 29, 2018	Apr. 12, 2018	Jan. 22, 2018	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Dividends Payable [Line Items]
Cash dividend declared per common share				$ 0.16	$ 0.14	$ 0.44	$ 0.42
First Quarter [Member]
Dividends Payable [Line Items]
Dividend Declared Date						Jan. 22, 2018
Shareholders Record Date						Feb. 28, 2018
Dividend Payable Date						Mar. 12, 2018
Cash dividend declared per common share			$ 0.14
Second Quarter [Member]
Dividends Payable [Line Items]
Dividend Declared Date						Apr. 12, 2018
Shareholders Record Date						Apr. 27, 2018
Dividend Payable Date						May 04, 2018
Cash dividend declared per common share		$ 0.14
Third Quarter [Member]
Dividends Payable [Line Items]
Dividend Declared Date						May 29, 2018
Shareholders Record Date						Jul. 02, 2018
Dividend Payable Date						Jul. 16, 2018
Cash dividend declared per common share	$ 0.16

X

- Definition

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

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-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://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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Date the dividend to be paid was declared, 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
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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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