Stockholders' Equity (Additional Information) (Detail) (USD $)	3 Months Ended
Mar. 31, 2015	Aug. 31, 2013
Stockholders Equity Note [Line Items]
Treasury Stock, Shares, Acquired	351,369us-gaap_TreasuryStockSharesAcquired
Treasury Stock Value Acquired Cost Method	$ 9,038,000
Repurchase Program
Stockholders Equity Note [Line Items]
Share Repurchase Program Shares Authorized To Acquire Outstanding Common Stock Percentage		5.00%
Repurchase of outstanding shares of common stock under Stock Repurchase Program		1,260,000
Treasury Stock, Shares, Acquired	351,369
Stock Repurchased, Average Cost Per Share	$ 25.72
Treasury Stock Value Acquired Cost Method	$ 9,000,000

Share Repurchase Program Shares Authorized to Acquire Outstanding Common Stock Percentage

No definition available.

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- Definition

The number of shares authorized to be repurchased by an entity's Board of Directors under a stock repurchase plan.

+ References

No definition available.

+ Details

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- Definition

Total cost of shares repurchased divided by the total number of shares repurchased.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 505

-SubTopic 30

-Section 45

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=6405813&loc=d3e23239-112655

+ Details

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Period Type:	duration

- Definition

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

+ References

+ Details

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Namespace Prefix:	us-gaap_
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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.

+ References

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 04

-Article 3

Reference 2: 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

Reference 3: 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

Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 505

-SubTopic 30

-Section 45

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=6405813&loc=d3e23239-112655

+ Details

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Balance Type:	debit
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- Details

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