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Share-Based Compensation Plans - Summary of Activity Related to Stock Options Granted under University's Incentive Plan (Detail) - USD ($)
$ / shares in Units, $ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Total Shares outstanding, Beginning balance 1,272,000 2,220,000 2,452,000
Total Shares, Granted 0 0 0
Total Shares, Exercised (576,000) (946,000) (218,000)
Total Shares, Forfeited, canceled or expired (2,000) (2,000) (14,000)
Total Shares outstanding, Ending balance 694,000 1,272,000 2,220,000
Total Shares, Exercisable 694,000    
Employee Stock Option [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Total Shares, Granted 0 0 0
Weighted Average Exercise Price per Share Outstanding, Beginning balance $ 15.26 $ 14.71 $ 14.83
Weighted Average Exercise Price per Share, Granted 0 0 0
Weighted Average Exercise Price per Share, Exercised 12.79 13.97 15.97
Weighted Average Exercise Price per Share, Forfeited, canceled or expired 16.35 19.23 16.08
Weighted Average Exercise Price per Share Outstanding, Ending balance 17.31 $ 15.26 $ 14.71
Weighted Average Exercise Price per Share, Exercisable $ 17.31    
Weighted Average Remaining Contractual Term (Years), Outstanding 2 years 8 months 16 days    
Weighted Average Remaining Contractual Term (Years), Exercisable 2 years 8 months 16 days    
Aggregate Intrinsic Value, Outstanding $ 50,114    
Aggregate Intrinsic Value, Exercisable $ 50,114