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Common and Common Equivalent Shares - Schedule of Calculation of Shares Used in Basic and Diluted Net Income Per Common Share (Detail)
In Thousands, unless otherwise specified |
3 Months Ended | |
|---|---|---|
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Mar. 31, 2015
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Mar. 31, 2014
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| Earnings Per Share [Abstract] | ||
| Weighted average number of common shares outstanding | 94,231 | 99,076 |
| Weighted average number of dilutive common share equivalents | 1,094 | 1,620 |
| Weighted average number of common and common equivalent shares outstanding | 95,325 | 100,696 |
| Antidilutive securities not included in the diluted net income per common share calculation | 1 | |