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Share-Based Compensation - Summary of Activity Related to Stock Options Granted under University's Incentive Plan (Detail)
$ / shares in Units, $ in Thousands
 3 Months Ended
Mar. 31, 2018
USD ($)
$ / shares
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Total Shares outstanding, Beginning balance 694,000
Total Shares, Granted 0
Total Shares, Exercised (59,000)
Total Shares, Forfeited, canceled or expired 0
Total Shares outstanding, Ending balance 635,000
Total Shares, Exercisable 635,000
Employee Stock Option [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Total Shares, Granted 0
Weighted Average Exercise Price per Share Outstanding, Beginning balance | $ / shares $ 17.31
Weighted Average Exercise Price per Share, Granted | $ / shares 0
Weighted Average Exercise Price per Share, Exercised | $ / shares 15.44
Weighted Average Exercise Price per Share, Forfeited, canceled or expired | $ / shares 0
Weighted Average Exercise Price per Share Outstanding, Ending balance | $ / shares 17.49
Weighted Average Exercise Price per Share, Exercisable | $ / shares $ 17.49
Weighted Average Remaining Contractual Term (Years), Outstanding 2 years 6 months 18 days
Weighted Average Remaining Contractual Term (Years), Exercisable 2 years 6 months 18 days
Aggregate Intrinsic Value, Outstanding | $ $ 55,464
Aggregate Intrinsic Value, Exercisable | $ $ 55,464