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Stock-Based Compensation (Detail) - (Table 5) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 9 Months Ended
Jun. 18, 2018
Sep. 30, 2018
Sep. 30, 2018
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]      
Outstanding at January 1, 2012     2,848,000
Outstanding at January 1, 2012 (in Dollars per share)     $ 23.87
Granted 225,000   576,000
Granted (in Dollars per share)     $ 32.40
Exercised     (581,000)
Exercised (in Dollars per share)     $ 22.03
Cancelled/Forfeited     (23,000)
Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures and Expirations in Period, Weighted Average Exercise Price     $ 22.59
Outstanding at June 30, 2012   2,820,000 2,820,000
Outstanding at June 30, 2012 (in Dollars per share)   $ 26.00 $ 26.00
Outstanding at June 30, 2012   4 years 10 months 24 days  
Outstanding at June 30, 2012 (in Dollars)   $ 26,128 $ 26,128
Exercisable at June 30, 2012   1,101,000 1,101,000
Exercisable at June 30, 2012 (in Dollars per share)   $ 24.72 $ 24.72
Exercisable at June 30, 2012   4 years  
Exercisable at June 30, 2012 (in Dollars)   $ 11,607 $ 11,607