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Common and Common Equivalent Shares - Schedule of Calculation of Shares Used in Basic and Diluted Net Income Per Share (Detail) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Earnings Per Share [Abstract]
Weighted average number of common shares outstanding	99,469	99,506	99,116	98,618	98,226	97,876	97,086	96,538	99,112	97,386	95,412
Weighted average number of dilutive common share equivalents									1,857	1,996	2,180
Weighted average number of common and common equivalent shares outstanding	101,080	101,178	101,098	100,784	100,212	99,618	99,090	98,798	100,969	99,382	97,592
Antidilutive securities not included in the diluted earnings per share calculation									35	58	90

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- Definition

Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

+ References

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 260

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-Section 50

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Additional shares included in the calculation of diluted EPS as a result of the potentially dilutive effect of share based payment arrangements using the treasury stock method.

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The average number of shares or units issued and outstanding that are used in calculating diluted EPS or earnings per unit (EPU), determined based on the timing of issuance of shares or units in the period.

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