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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 12 Months Ended
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Earnings Per Share [Abstract]                      
Weighted average number of common shares outstanding 92,728 92,604 92,182 92,269 92,790 92,949 92,500 94,231 92,422 93,077 98,588
Weighted average number of dilutive common share equivalents                 687 883 1,299
Weighted average number of common and common equivalent shares outstanding 93,347 93,146 92,945 93,091 93,536 93,646 93,495 95,325 93,109 93,960 99,887
Antidilutive securities not included in the diluted net income per common share calculation                 2   1