v2.4.0.8

Share-Based Compensation Expense and Related Income Tax Benefit (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended				9 Months Ended
	Sep. 30, 2014		Sep. 30, 2013		Sep. 30, 2014		Sep. 30, 2013
Schedule Of Employee Service Share Based Compensation Expense Allocation [Line Items]
Total share-based compensation	$ 1,911		$ 1,701		$ 5,236		$ 5,792
Income tax benefit	576		524		1,637		1,738
Options
Schedule Of Employee Service Share Based Compensation Expense Allocation [Line Items]
Total share-based compensation	318		737		1,323		2,922
Restricted stock units
Schedule Of Employee Service Share Based Compensation Expense Allocation [Line Items]
Total share-based compensation	1,260		453		3,012		1,287
Performance Shares
Schedule Of Employee Service Share Based Compensation Expense Allocation [Line Items]
Total share-based compensation	161	[1]	276	[1]	498	[1]	776	[1]
ESPP
Schedule Of Employee Service Share Based Compensation Expense Allocation [Line Items]
Total share-based compensation	$ 172		$ 235		$ 403		$ 807
[1] Includes Performance Stock Units ("PSUs") and market-performance based units ("MSUs").

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- Definition

Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 1

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901



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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SAB TOPIC 14.F)

-URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809



Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (h)(1)(i)

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



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

-Publisher SEC

-Name Staff Accounting Bulletin (SAB)

-Number Topic 14

-Section F

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- Definition

The total recognized tax benefit related to compensation cost for equity-based payment arrangements recognized in income during the period.

+ 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 (h)(1)(i)

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

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