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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 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Earnings Per Share [Abstract]        
Weighted average number of common shares outstanding 98,411 99,116 98,689 98,868
Weighted average number of dilutive common share equivalents 1,455 1,982 1,537 2,074
Weighted average number of common and common equivalent shares outstanding 99,866 101,098 100,226 100,942
Antidilutive securities not included in the dilutive earnings per share calculation   138   68