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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, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Earnings Per Share [Abstract]                      
Weighted average number of common shares outstanding 92,790 92,949 92,500 94,231 98,066 99,088 98,411 99,076 93,077 98,588 99,112
Weighted average number of dilutive common share equivalents                 883 1,299 1,857
Weighted average number of common and common equivalent shares outstanding 93,536 93,646 93,495 95,325 99,129 100,145 99,866 100,696 93,960 99,887 100,969
Antidilutive securities not included in the diluted net income per common share calculation                   1 35