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Common and Common Equivalent Shares - Schedule of Calculation of Shares Used in Basic and Diluted Net Income Per Share (Detail) - shares
shares in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Earnings Per Share [Abstract]        
Weighted average number of common shares outstanding 92,182 92,500 92,225 93,361
Weighted average number of dilutive common share equivalents 763 995 793 1,044
Weighted average number of common and common equivalent shares outstanding 92,945 93,495 93,018 94,405
Antidilutive securities not included in the diluted net income per common share calculation     3