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Share-Based Compensation - Summary of Activity Related to Stock Options Granted under Company's Incentive Plan (Detail)
$ / shares in Units, $ in Thousands
 3 Months Ended
Mar. 31, 2017
USD ($)
$ / shares
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Total Shares outstanding, Beginning balance 1,272,000
Total Shares, Granted 0
Total Shares, Exercised (243,000)
Total Shares, Forfeited, canceled or expired 0
Total Shares outstanding, Ending balance 1,029,000
Total Shares, Exercisable 1,029,000
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 $ 15.26
Weighted Average Exercise Price per Share, Granted | $ / shares 0
Weighted Average Exercise Price per Share, Exercised | $ / shares 12.83
Weighted Average Exercise Price per Share, Forfeited, canceled or expired | $ / shares 0
Weighted Average Exercise Price per Share Outstanding, Ending balance | $ / shares 15.84
Weighted Average Exercise Price per Share, Exercisable | $ / shares $ 15.84
Weighted Average Remaining Contractual Term (Years), Outstanding 2 years 11 months 12 days
Weighted Average Remaining Contractual Term (Years), Exercisable 2 years 11 months 12 days
Aggregate Intrinsic Value, Outstanding | $ $ 57,369
Aggregate Intrinsic Value, Exercisable | $ $ 57,369