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Number of shares under non-option equity instrument agreements that were either cancelled or expired.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (c)(1)(iv)(3)-(4)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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Number of shares of stock issued as of the balance sheet date, including shares that had been issued and were previously outstanding but which are now held in the treasury.

+ References

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- Definition

Total number of shares issued during the period, including shares forfeited, as a result of Restricted Stock Awards.

+ 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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-Publisher FASB

-Name Accounting Standards Codification

-Topic 505

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-Section S99

-Paragraph 1

-Subparagraph (SX 210.3-04)

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

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- Definition

Number of share options (or share units) exercised during the current period.

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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

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-Section 50

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 505

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-Subparagraph (SX 210.3-04)

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-SubTopic 10

-Section S99

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-Paragraph 2

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-Name Regulation S-X (SX)

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-Paragraph 29, 30

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Number of shares that have been repurchased during the period and have not been retired and are not held in treasury. Some state laws may govern the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock.

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Shares acquired through cashless exercise.

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No definition available.

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Stockholders' Equity - Activity Relating to Common Shares (Detail) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares repurchased	(6,666)		(6,666)
Options exercised	1,725		1,925
Shares acquired through cashless exercise	(1,284)	(147)	(1,683)	(147)
Common Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Beginning balance, shares			41,889
Options exercised			1,925
Restricted stock grant			850
Shares cancelled			(1,683)
Ending balance, shares	42,981		42,981
Treasury Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Beginning balance, shares			(1,018)
Shares repurchased			(6,666)
Shares acquired through cashless exercise			(1,683)
Shares cancelled			1,683
Ending balance, shares	(7,684)		(7,684)
Outstanding Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Beginning balance, shares			40,871
Shares repurchased			(6,666)
Options exercised			1,925
Restricted stock grant			850
Shares acquired through cashless exercise			(1,683)
Ending balance, shares	35,297		35,297