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Stock-Based Compensation (Detail) - (Table 4) - USD ($)
$ / shares in Units, $ in Thousands
 12 Months Ended
Jun. 18, 2018
Jul. 20, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]          
Outstanding at January 1, 2012     2,846,000 2,249,000 3,024,000
Outstanding at January 1, 2012 (in Dollars per share)     $ 23.87 $ 19.81 $ 15.67
Granted (225,000) (225,000) (585,000) (1,593,000) (393,000)
Granted (in Dollars per share)     $ 32.39 $ 25.03 $ 22.57
Exercised     (593,000) (983,000) (1,119,000)
Exercised (in Dollars per share)     $ 22.04 $ 16.49 $ 9.57
Cancelled/Forfeited     (23,000) (13,000) (49,000)
Outstanding at June 30, 2012     2,815,000 2,846,000 2,249,000
Outstanding at June 30, 2012 (in Dollars per share)     $ 26.03 $ 23.87 $ 19.81
Outstanding at June 30, 2012     4 years 8 months 12 days    
Outstanding at June 30, 2012 (in Dollars)     $ 11,911    
Exercisable at June 30, 2012     1,164,000    
Exercisable at June 30, 2012 (in Dollars per share)     $ 25.27    
Stock based compensation, shares exercisable, weighted average remaining contractual term     3 years 9 months 18 days    
Exercisable at June 30, 2012 (in Dollars)     $ 5,813    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures and Expirations in Period, Weighted Average Exercise Price     $ 22.59 $ 23.49 $ 20.39