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

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

+ References

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-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 50
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- Definition

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

+ References

No definition available.

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Amount of stock repurchase plan authorized.

+ References

No definition available.

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- Definition

Number of shares that have been repurchased during the period and are being held in treasury.

+ References

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)
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- Definition

Equity impact of the cost of common and preferred stock that were repurchased during the period. Recorded using the cost method.

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-Name Accounting Standards Codification
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-Section 50
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- Definition

Equity.

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No definition available.

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Stockholders' Equity - Additional Information (Detail) - USD ($)			3 Months Ended		6 Months Ended
	Apr. 12, 2017	Jan. 23, 2017	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Equity [Line Items]
Treasury shares acquired					354,293
Shares repurchased during period					$ 8,900,000
Dividends per share declared on outstanding common stock	$ 0.14	$ 0.14	$ 0.14	$ 0.14	$ 0.28	$ 0.28
Dividends payable date	Jul. 03, 2017	Mar. 02, 2017
Dividends payable, shareholders record date	Jun. 14, 2017	Feb. 17, 2017
Maximum [Member]
Equity [Line Items]
Amount of shares authorized to repurchase				$ 20,000,000		$ 20,000,000