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Stockholders' Equity - Additional Information (Detail) - USD ($)				3 Months Ended		9 Months Ended
	Aug. 31, 2017	Apr. 12, 2017	Jan. 23, 2017	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016	Jun. 30, 2016
Equity [Line Items]
Treasury shares acquired						761,000
Dividends per share declared on outstanding common stock	$ 0.14	$ 0.14	$ 0.14	$ 0.14	$ 0.14	$ 0.42	$ 0.42
Dividends payable date	Oct. 24, 2017	Jul. 03, 2017	Mar. 02, 2017
Dividends payable, shareholders record date	Sep. 12, 2017	Jun. 14, 2017	Feb. 17, 2017
June 2016 Share Repurchase Program [Member]
Equity [Line Items]
Treasury shares acquired						760,559
Shares repurchased during period						$ 17,900,000
September 2017 Share Repurchase Program [Member]
Equity [Line Items]
Treasury shares acquired						0
Maximum [Member] | June 2016 Share Repurchase Program [Member]
Equity [Line Items]
Amount of shares authorized to repurchase								$ 20,000,000
Maximum [Member] | September 2017 Share Repurchase Program [Member]
Equity [Line Items]
Amount of shares authorized to repurchase				$ 20,000,000		$ 20,000,000

X

- Definition

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

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

+ References

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-Name Accounting Standards Codification
-Topic 230
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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Topic 505
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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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