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Share-Based Compensation - Summary of Activity Related to Stock Options Granted under Company's Incentive Plan (Detail) - Employee Stock Option [Member]
$ / shares in Units, shares in Thousands, $ in Thousands
 9 Months Ended
Sep. 30, 2015
USD ($)
$ / shares
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Total Shares outstanding, Beginning balance 2,452
Total Shares, Granted 0
Total Shares, Exercised (177)
Total Shares, Forfeited, canceled or expired (10)
Total Shares outstanding, Ending balance 2,265
Total Shares, Exercisable 2,054
Total Shares, Available for issuance 1,936
Weighted Average Exercise Price per Share Outstanding, Beginning balance | $ / shares $ 14.83
Weighted Average Exercise Price per Share, Granted | $ / shares 0
Weighted Average Exercise Price per Share, Exercised | $ / shares 16.20
Weighted Average Exercise Price per Share, Forfeited, canceled or expired | $ / shares 15.80
Weighted Average Exercise Price per Share Outstanding, Ending balance | $ / shares 14.72
Weighted Average Exercise Price per Share, Exercisable | $ / shares $ 14.60
Weighted Average Remaining Contractual Term (Years), Outstanding 4 years 29 days
Weighted Average Remaining Contractual Term (Years), Exercisable 3 years 11 months 5 days
Aggregate Intrinsic Value, Outstanding | $ $ 52,701
Aggregate Intrinsic Value, Exercisable | $ $ 48,048