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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) - shares
shares in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Earnings Per Share [Abstract]        
Weighted average number of common shares outstanding 92,500 98,411 93,361 98,689
Weighted average number of dilutive common share equivalents 995 1,455 1,044 1,537
Weighted average number of common and common equivalent shares outstanding 93,495 99,866 94,405 100,226
Antidilutive securities not included in the diluted net income per common share calculation 0 0 0 0