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Option Activity under Stock-Based Compensation Plans (Detail)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended
Mar. 31, 2016
USD ($)
$ / shares
shares
Number of Options Outstanding  
Beginning balance | shares 2,891
Options granted | shares 229
Options exercised | shares (12)
Ending balance | shares 3,063
Vested and expected to vest at end of period | shares 2,996
Exercisable at end of period | shares 1,509
Weighted-Average Price Per Share  
Beginning balance | $ / shares $ 23.34
Options granted | $ / shares 21.48
Options exercised | $ / shares 13.69
Ending balance | $ / shares 22.97
Vested and expected to vest at end of period | $ / shares 23.09
Exercisable at end of period | $ / shares $ 26.49
Weighted Average Remaining Contractual Life (In years)  
Balance at March 31, 2016 7 years 7 days
Outstanding options vested and expected to vest at end of period 6 years 11 months 23 days
Options exercisable at end of period 5 years 1 month 10 days
Aggregate Intrinsic Value  
Balance at March 31, 2016 | $ $ 4,835
Outstanding options (vested and expected to vest) at end of period | $ 4,663
Options exercisable at end of period | $ $ 2,204
Unvested  
Number of Options Outstanding  
Options cancelled | shares (9)
Weighted-Average Price Per Share  
Options cancelled | $ / shares $ 17.87
Vested  
Number of Options Outstanding  
Options cancelled | shares (36)
Weighted-Average Price Per Share  
Options cancelled | $ / shares $ 49.30