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Share-Based Compensation - Summary of Activity Related to Stock Options Granted under Company's Incentive Plan (Detail)
$ / shares in Units, shares in Thousands, $ in Thousands
 6 Months Ended
Jun. 30, 2016
USD ($)
$ / shares
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Total Shares outstanding, Beginning balance 2,220
Total Shares, Granted 0
Total Shares, Exercised (493)
Total Shares, Forfeited, canceled or expired 0
Total Shares outstanding, Ending balance 1,727
Total Shares, Exercisable 1,721
Total Shares, Available for issuance 1,794
Employee Stock Option [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Weighted Average Exercise Price per Share Outstanding, Beginning balance | $ / shares $ 14.71
Weighted Average Exercise Price per Share, Granted | $ / shares 0
Weighted Average Exercise Price per Share, Exercised | $ / shares 14.17
Weighted Average Exercise Price per Share, Forfeited, canceled or expired | $ / shares 0
Weighted Average Exercise Price per Share Outstanding, Ending balance | $ / shares 14.87
Weighted Average Exercise Price per Share, Exercisable | $ / shares $ 14.83
Weighted Average Remaining Contractual Term (Years), Outstanding 3 years 4 months 10 days
Weighted Average Remaining Contractual Term (Years), Exercisable 3 years 4 months 6 days
Aggregate Intrinsic Value, Outstanding | $ $ 43,270
Aggregate Intrinsic Value, Exercisable | $ $ 43,182