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Share-Based Compensation - Summary of Activity Related to Stock Options Granted under Company's Incentive Plan (Detail) - Jun. 30, 2015 - Employee Stock Option [Member] - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
Total
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 (167)
Total Shares, Forfeited, canceled or expired (7)
Total Shares outstanding, Ending balance 2,278
Total Shares, Exercisable 2,061
Total Shares, Available for issuance 1,928
Weighted Average Exercise Price per Share Outstanding, Beginning balance $ 14.83
Weighted Average Exercise Price per Share, Granted 0
Weighted Average Exercise Price per Share, Exercised 16.14
Weighted Average Exercise Price per Share, Forfeited, canceled or expired 15.98
Weighted Average Exercise Price per Share Outstanding, Ending balance 14.73
Weighted Average Exercise Price per Share, Exercisable $ 14.59
Weighted Average Remaining Contractual Term (Years), Outstanding 4 years 4 months 2 days
Weighted Average Remaining Contractual Term (Years), Exercisable 4 years 2 months 9 days
Aggregate Intrinsic Value, Outstanding $ 63,018
Aggregate Intrinsic Value, Exercisable $ 57,306