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Stockholders' Equity - Additional Information (Detail) - USD ($)						3 Months Ended		6 Months Ended
	Jul. 26, 2016	Jun. 07, 2016	Apr. 26, 2016	Mar. 17, 2016	Feb. 09, 2016	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015	Nov. 30, 2014
Subsequent Event [Line Items]
Cash dividends declared per common share (usd per share)			$ 0.07		$ 0.07	$ 0.07	$ 0.06	$ 0.14	$ 0.12
Payments of common stock dividends		$ 4,300,000		$ 4,300,000			$ 3,700,000	$ 8,600,000	$ 7,500,000
Value of shares repurchased								$ 33,100,000	5,000,000
April 2014 Repurchase Program
Subsequent Event [Line Items]
Authorized amount of common stock (shares)							$ 15,000,000		$ 15,000,000
Shares repurchased (shares)						1,288,751	96,725	2,580,725	330,362
Value of shares repurchased						$ 16,800,000	$ 1,400,000	$ 33,100,000	$ 5,000,000
November 2014 Repurchase Program
Subsequent Event [Line Items]
Authorized amount of common stock (shares)										$ 75,000,000
Subsequent Event
Subsequent Event [Line Items]
Cash dividends declared per common share (usd per share)	$ 0.07

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)
-URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770

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Amount of cash outflow in the form of ordinary dividends to common shareholders of the parent entity.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
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-Section 45
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Reference 2: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
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Amount of stock repurchase plan authorized.

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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 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644

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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.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
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