Stockholders' Equity - Additional Information (Detail) (Common Stock, USD $) In Millions, except Share data, unless otherwise specified	1 Months Ended
Sep. 15, 2011	Oct. 31, 2013
Common Stock
Class of Stock [Line Items]
Stock repurchase program, authorized amount	$ 25
Share repurchase program, term	The Company will determine the timing and amount of the transactions based on its evaluation of market conditions and other factors. The repurchase program may be suspended or discontinued at any time and has no expiration date.
Cumulative stock repurchased, shares		3,294,666
Cumulative stock repurchased, value		$ 18.7

Share Repurchase Program, Term

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- Definition

Amount of a stock repurchase plan authorized by an entity's Board of Directors.

+ References

No definition available.

+ Details

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- Definition

Number of common and preferred shares that were previously issued and that were repurchased by the issuing entity and held in treasury on the financial statement date. This stock has no voting rights and receives no dividends.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.28,29)

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 29, 30

-Article 5

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- Definition

The amount allocated to treasury stock. Treasury stock is common and preferred shares of an entity that were issued, repurchased by the entity, and are held in its treasury.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 505

-SubTopic 30

-Section 50

-Paragraph 4

-URI http://asc.fasb.org/extlink&oid=6405834&loc=d3e23315-112656

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