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Summary Information about Options Outstanding (Detail)
12 Months Ended
Dec. 31, 2015
$ / shares
shares
Share Based Compensation Shares Authorized Under Stock Option Plans Exercise Price Range [Line Items]  
Range of Exercise Prices, lower limit $ 5.20
Range of Exercise Prices, upper limit $ 43.40
Options Number Outstanding | shares 781,804
Options Outstanding Weighted Average Remaining Contractual Life (Years) 6 years 7 months 17 days
Options Outstanding Weighted Average Exercise Price $ 11.48
Options Number Exercisable | shares 495,206
Options Exercisable Weighted Average Exercise Price $ 12.88
Range 1  
Share Based Compensation Shares Authorized Under Stock Option Plans Exercise Price Range [Line Items]  
Range of Exercise Prices, lower limit 5.20
Range of Exercise Prices, upper limit $ 8.40
Options Number Outstanding | shares 158,222
Options Outstanding Weighted Average Remaining Contractual Life (Years) 7 years 7 months 2 days
Options Outstanding Weighted Average Exercise Price $ 6.40
Options Number Exercisable | shares 100,345
Options Exercisable Weighted Average Exercise Price $ 6.64
Range 2  
Share Based Compensation Shares Authorized Under Stock Option Plans Exercise Price Range [Line Items]  
Range of Exercise Prices, lower limit 8.41
Range of Exercise Prices, upper limit $ 8.80
Options Number Outstanding | shares 230,688
Options Outstanding Weighted Average Remaining Contractual Life (Years) 7 years 10 months 2 days
Options Outstanding Weighted Average Exercise Price $ 8.80
Options Number Exercisable | shares 106,382
Options Exercisable Weighted Average Exercise Price $ 8.80
Range 3  
Share Based Compensation Shares Authorized Under Stock Option Plans Exercise Price Range [Line Items]  
Range of Exercise Prices, lower limit 8.81
Range of Exercise Prices, upper limit $ 12.00
Options Number Outstanding | shares 247,769
Options Outstanding Weighted Average Remaining Contractual Life (Years) 6 years 9 months 18 days
Options Outstanding Weighted Average Exercise Price $ 11.21
Options Number Exercisable | shares 147,229
Options Exercisable Weighted Average Exercise Price $ 11.41
Range 4  
Share Based Compensation Shares Authorized Under Stock Option Plans Exercise Price Range [Line Items]  
Range of Exercise Prices, lower limit 12.01
Range of Exercise Prices, upper limit $ 40.20
Options Number Outstanding | shares 140,775
Options Outstanding Weighted Average Remaining Contractual Life (Years) 3 years 4 months 21 days
Options Outstanding Weighted Average Exercise Price $ 21.06
Options Number Exercisable | shares 136,900
Options Exercisable Weighted Average Exercise Price $ 21.24
Range 5  
Share Based Compensation Shares Authorized Under Stock Option Plans Exercise Price Range [Line Items]  
Range of Exercise Prices, lower limit 40.21
Range of Exercise Prices, upper limit $ 43.40
Options Number Outstanding | shares 4,350
Options Outstanding Weighted Average Remaining Contractual Life (Years) 1 year 2 months 19 days
Options Outstanding Weighted Average Exercise Price $ 43.38
Options Number Exercisable | shares 4,350
Options Exercisable Weighted Average Exercise Price $ 43.38