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Stock-Based Compensation - Information about Stock Options Outstanding Under all Stock Plans (Detail) - Jun. 30, 2015 - $ / shares
Total
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Lower range of exercise prices $ 5.50
Upper range of exercise prices $ 11.00
Options Outstanding, Number 1,435,661
Options Outstanding, Weighted Average Contractual Life (Years) 3 years 9 months 18 days
Options Outstanding, Weighted Average Exercise Price $ 7.84
Options Exercisable, Number 900,386
Options Exercisable, Weighted Average Exercise Price $ 8.09
Range One [Member]  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Lower range of exercise prices 5.50
Upper range of exercise prices $ 6.00
Options Outstanding, Number 3,379
Options Outstanding, Weighted Average Contractual Life (Years) 4 years 4 months 17 days
Options Outstanding, Weighted Average Exercise Price $ 5.66
Options Exercisable, Number 3,067
Options Exercisable, Weighted Average Exercise Price $ 5.62
Range Two [Member]  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Lower range of exercise prices 6.01
Upper range of exercise prices $ 6.50
Options Outstanding, Number 16,267
Options Outstanding, Weighted Average Contractual Life (Years) 3 years 9 months 18 days
Options Outstanding, Weighted Average Exercise Price $ 6.23
Options Exercisable, Number 11,660
Options Exercisable, Weighted Average Exercise Price $ 6.23
Range Three [Member]  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Lower range of exercise prices 6.51
Upper range of exercise prices $ 7.00
Options Outstanding, Number 39,022
Options Outstanding, Weighted Average Contractual Life (Years) 2 years 11 months 16 days
Options Outstanding, Weighted Average Exercise Price $ 6.85
Options Exercisable, Number 35,469
Options Exercisable, Weighted Average Exercise Price $ 6.86
Range Four [Member]  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Lower range of exercise prices 7.01
Upper range of exercise prices $ 7.50
Options Outstanding, Number 822,679
Options Outstanding, Weighted Average Contractual Life (Years) 4 years 9 months 18 days
Options Outstanding, Weighted Average Exercise Price $ 7.18
Options Exercisable, Number 429,320
Options Exercisable, Weighted Average Exercise Price $ 7.17
Range Five [Member]  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Lower range of exercise prices 7.51
Upper range of exercise prices $ 8.00
Options Outstanding, Number 28,000
Options Outstanding, Weighted Average Contractual Life (Years) 5 years 3 months 29 days
Options Outstanding, Weighted Average Exercise Price $ 7.79
Options Exercisable, Number 10,530
Options Exercisable, Weighted Average Exercise Price $ 7.83
Range Six [Member]  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Lower range of exercise prices 8.01
Upper range of exercise prices $ 8.50
Options Outstanding, Number 136,695
Options Outstanding, Weighted Average Contractual Life (Years) 5 years 6 months 18 days
Options Outstanding, Weighted Average Exercise Price $ 8.17
Options Exercisable, Number 27,648
Options Exercisable, Weighted Average Exercise Price $ 8.45
Range Seven [Member]  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Lower range of exercise prices 8.51
Upper range of exercise prices $ 9.00
Options Outstanding, Number 39,750
Options Outstanding, Weighted Average Contractual Life (Years) 1 year 5 months 9 days
Options Outstanding, Weighted Average Exercise Price $ 8.73
Options Exercisable, Number 34,659
Options Exercisable, Weighted Average Exercise Price $ 8.74
Range Eight [Member]  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Lower range of exercise prices 9.01
Upper range of exercise prices $ 9.50
Options Outstanding, Number 288,319
Options Outstanding, Weighted Average Contractual Life (Years) 10 months 2 days
Options Outstanding, Weighted Average Exercise Price $ 9.16
Options Exercisable, Number 287,683
Options Exercisable, Weighted Average Exercise Price $ 9.16
Range Nine [Member]  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Lower range of exercise prices 9.51
Upper range of exercise prices $ 10.00
Options Outstanding, Number 20,650
Options Outstanding, Weighted Average Contractual Life (Years) 2 years 10 months 24 days
Options Outstanding, Weighted Average Exercise Price $ 9.64
Options Exercisable, Number 19,450
Options Exercisable, Weighted Average Exercise Price $ 9.64
Range Ten [Member]  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Lower range of exercise prices 10.01
Upper range of exercise prices $ 11.00
Options Outstanding, Number 40,900
Options Outstanding, Weighted Average Contractual Life (Years) 11 months 19 days
Options Outstanding, Weighted Average Exercise Price $ 10.64
Options Exercisable, Number 40,900
Options Exercisable, Weighted Average Exercise Price $ 10.64