Stockholders' Equity - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	1 Months Ended
Apr. 30, 2013	May 08, 2013 Accelerated share repurchase program [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Shares authorized for repurchase	5.00%
Accelerated share repurchase transaction, paid		$ 115
Received from accelerated share repurchase stock settlement		2.8
Percentage of repurchased accelerated share repurchase program		76.00%

Accelerated Share Repurchase Program Repurchase Share Percent

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- Definition

Stock Repurchase Program Percentage Of Outstanding Shares Authorized For Repurchase

+ References

No definition available.

+ Details

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- Definition

Amount of cash receipt from (payment to) bank; or stock received from (issuance to) bank in the settlement of the accelerated share repurchase agreement.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 505

-SubTopic 30

-Section 25

-Paragraph 5

-URI http://asc.fasb.org/extlink&oid=6405686&loc=d3e22802-112653

+ Details

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Period Type:	instant

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- Definition

Number of shares that have been repurchased and retired during the period.

+ 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 SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 29, 30

-Article 5

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